Refereed Journal Papers
K. Jana, A. B. deSouza, Y. Mi, S. Gholam-Mirzaei, D. H. Ko, S. R. Tripathi, S. Sederberg, J. A. Gupta and P. B. Corkum, "Terahertz generation via all-optical quantum control in two-dimensional and three-dimensional materials" Physical Review B, Vol. 111, L161405 (2025).
A. Ouchi and S. R. Tripathi, "Terahertz circular dichroism spectroscopy of 3D chiral metallic microstructures fabricated using high precision CNC machining" IEEE Journal of Microwaves, vol. 5, Issue 1, pp. 108-115 (2025).
Selected as "Spotlight Article".
K. Yamamura, G. Otake, A. Ouchi, D. Moraru, A. Nakamura and S. R. Tripathi. "Ellipticity enhancement of a terahertz wave circular polarizer made of 3D chiral metamaterial" IEEE Photonics Technology Letters, vol. 36, Issue 7, pp. 457-460 (2024).
H. Ichikawa, K. Takeya and S. R. Tripathi, "Linear dichroism and birefringence spectra of bamboo and its use as a wave plate in the terahertz frequency region," Optical Materials Express, vol. 13, Issue 4, pp, 966-981 (2023)
Selected as "Editor's pick".
Selected as a cover image of vol. 13, issue 4, Optical Materials Express.
H. Uchida, T. Kawauchi, G. Otake, C. Koyama, K. Takeya and S. R. Tripathi, "Optical thin film coated organic nonlinear crystal for efficient terahertz wave generation" Scientific Reports, vol. 12, No. 15082, pp. 1-9 (2022)
K. Hashimoto, P. B. Ishai, E. Bründermann, and S. R. Tripathi, "Dielectric property measurement of human sweat using attenuated total reflection terahertz time domain spectroscopy" Biomedical Optics Express, vol. 13, Issue 9, pp. 4572-4582 (2022)
K. Hashimoto and S. R. Tripathi, “Non-Destructive Identification of Drugs in Plastic Packaging Using Attenuated Total Reflection Terahertz Time-Domain Spectroscopy” Optics, vol. 3, No. 2, pp. 99-106 (2022)
Featured in Azo Optics: Detecting a Sample Using its Spectral Fingerprint; Identifying drugs in packaging using spectroscopy
H. Tomita, K. Hashimoto, K. Takeya and S. R. Tripathi, "Development of a terahertz wave circular polarizer using a 2D array of metallic helix metamaterial" Optics Letters, vol. 46, Issue 9, pp. 2232-2235 (2021).
H. Uchida, C. Koyama, T. Takagi, P. B. Wang, T. Kamei, S. R. Tripathi, K. Kawase and K. Takeya, "Enhanced terahertz wave generation from Cytop antireflection-coated DAST crystal" Journal of Infrared, Millimeter and Terahertz Waves, vol. 41, pp. 552-556, (2020)
Shun Takagi, Shogo Takahashi, Kei Takeya and Saroj R. Tripathi, "Influence of delay stage positioning error on signal-to-noise ratio, dynamic range and bandwidth of terahertz time-domain spectroscopy" Applied Optics vol. 59, Issue 3, pp. 841-845 (2020)
Selected as one of the most downloaded and standout articles from Applied optics and Biomedical Optics Express (research on terahertz optics and imaging) in 2020. OSA is providing complimentary access to this article till the end of May 2021.
Kei Takeya, Keisuke Matsumura, Ryohei Takahashi, Takashi Fukui, Saroj R. Tripathi and Kodo Kawase, "Optical parameters of gas hydrates for terahertz applications" Journal of Infrared, Millimeter and Terahertz Waves, vol. 41, pp. 375-381, (2019)
Kei Takeya, Ryohei Takahashi, Takashi Fukui, Saroj R. Tripathi, and Kodo Kawase, "Terahertz characterization of propane hydrate "Japanese Journal of Applied Physics, vol. 58, 032203, (2019)
Saroj R. Tripathi, Paul Ben Ishai and Kodo Kawase, "Frequency of the resonance of human sweat duct in normal mode of radiation" Biomedical Optics Express, vol. 9, Issue 3, 1301-1308, (2018)
Saroj R. Tripathi, S. Takahashi, K. Kinumura and K. Kawase, “Frequency of resonance of human sweat duct in different modes of operation” Proceedings of SPIE, Vol. 10492, 1049201- (1-5), 2018
Kei Takeya, Tsubasa Minami, Hiroyo Okano, Saroj R. Tripathi, Kodo Kawase, "Enhanced Cherenkov phase matching terahertz wave generation via a magnesium oxide doped lithium niobate ridged waveguide crystal" APL Photonics, Vol. 2, 016102, (2017)
Highlighted by the publisher in a social media. Link
Saroj R. Tripathi, Yuya Sugiyama, Kosuke Murate, Kazuki Imayama and Kodo Kawase, "Terahertz wave three-dimensional computed tomography based on injection-seeded terahertz wave parametric emitter and detector" Optics Express, vol. 24, Issue 6, pp. 6433-6440 (2016)
Figure 4 of this article has been selected as a cover movie in Optics Express (March issue, 2016)
Mikiya Kato, Saroj R. Tripathi, Kosuke Murate, Kazuki Imayama and Kodo Kawase, "Non-destructive drug inspection in covering materials using a terahertz spectral imaging system with injection-seeded terahertz parametric generation and detection" Optics Express, vol. 24, Issue 6, pp. 6425-6432 (2016)
Paul Ben Ishai, Saroj R. Tripathi, Kodo Kawase, Alexander Puzenko and Yuri Feldman, "What is the primary mover of water dynamics ? " Physical Chemistry Chemical Physics (PCCP). vol. 17, pp. 15428-15434 (2015).
Saroj R. Tripathi, Eisuke Miyata, Paul Ben Ishai and Kodo Kawase, "Morphology of human sweat ducts observed by optical coherence tomography and their frequency of resonance in the terahertz frequency region" Scientific Reports, vol. 5, No. 9071, pp 1- 7, (2015).
This paper has been highlighted by publisher with the title of "what resonates with your skin ?"
This paper has been selected as a high-profile featured article by Nature Asia/Japan.
Also in Optical Coherence tomography NEWS.
Saroj R. Tripathi, Kousuke Murate and Kodo Kawase, "High power terahertz wave generation via non-linear optical processes", A. J. Physics vol. 24, No. 3, pp 363-368, (2015)
Yu Guan, Manabu Yamamoto, Toshiyuki Kitazawa, Saroj. R. Tripathi, Kei Takeya and Kodo Kawase, ”A concealed barcode identification system using terahertz time domain spectroscopy”, Journal of Infrared, Millimeter and Terahertz wave vol. 36, Issue 3, pp. 298-311, (2015)
Yusuke Taira, Saroj R. Tripathi*, Kousuke Murate, Shin'ichiro Hayashi, Koji Nawata, Hiroaki Minamide and Kodo Kawase, "A terahertz wave parametric amplifier with a gain of 55dB" IEEE Transactions on Terahertz Science and Technology, vol. 4, No. 6, pp. 753-755, (2014) * Corresponding author.
Kei Takeya, Hiroyo Okano, Saroj R. Tripathi and Kodo Kawase, "Development of measurement and analysis techniques using terahertz waves and their sources" (Invited article) IEICE Transactions on Electronics. vol. J97-C, No. 11, pp. 420-428, (2014)
Kousuke Murate, Yuusuke Taira, Saroj R. Tripathi, Shin'ichiro Hayashi, Koji Nawata, Hiroaki Minamide and Kodo Kawase " A high dynamic range and spectrally flat terahertz spectrometer based on optical parametric process in LiNbO3" IEEE Transactions on Terahertz Science and Technology, vol. 4, No. 4, pp. 523- 526, (2014).
Saroj R. Tripathi, Yuusuke Taira, Shin'ichiro Hayashi, Kouji Nawata, Kousuke Murate, Hiroaki Minamide and Kodo Kawase, "Terahertz wave parametric amplifier" Optics Letters, vol. 39, No. 6. pp 1649-1652, (2014).
Saroj R. Tripathi, Kousuke Murate, Hirohisa Uchida, Kei Takeya and Kodo Kawase, "A fiber laser pumped, high-power terahertz wave source based on optical rectification of femtosecond pulses in 4-Dimethylamino-N-methyl-4-Stibazolium Tosylate crystal " Applied Physics Express (APEX), vol. 6, pp. 072703-1, (2013).
Hirohisa Uchida, Saroj R. Tripathi, Koji Suizu, Takayuki Shibuya, Takashi Osumi and Kodo Kawase "Widely tunable broadband terahertz radiation generation using a configurationally locked polyene 2-[3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene] malononitrile crystal via difference frequency generation" Applied Physics B: Lasers and Optics, vol. 111, issue 3, pp. 489-493, (2013).
Saroj R. Tripathi, Makoto Aoki, Masanori Takeda, Toshiaki Asahi, Iwao Hosako and Norihisa Hiromoto, "Accurate complex refractive index with standard deviation of ZnTe measured by terahertz time domain spectroscopy" Japanese Journal of Applied Physics, vol. 52, No. 4, 042401-4 (2013)
Saroj R. Tripathi, Hiroo Inoue, Tsuyoshi Hasegawa and Kodo Kawase, "Non-destructive inspection of chloride ion in concrete structures using attenuated total reflection of millimeter waves", Journal of Infrared, Millimeter and Terahertz Waves, vol. 34, issue 2, pp. 181-186, (2013).
Makoto Aoki, Saroj R. Tripathi, Masanori Takeda and Norihisa Hiromoto, ”Angle dependent condensing efficiency of Winston cone in terahertz region” , Infrared Physics and Technology, vol. 56, pp. 8-11 (2013)
Saroj R. Tripathi, Hidehiro Ogura, Hiroyuki Kawagoe, Hiroo Inoue, Tsuyoshi Hasegawa, Kei Takeya and Kodo Kawase, "Measurement of chloride ion concentration in concrete structures using terahertz time domain spectroscopy (THz-TDS)", Corrosion Science, vol. 62, pp. 5-10 (2012)
This paper was listed as one of the top 25 downloaded articles from June to August 2012.
Makoto Aoki, Saroj R. Tripathi, Masanori Takeda and Norihisa Hiromoto, "Passive imaging and emissity measurement with a 4K cryocooled terahertz photoconductive detector", IEICE Electronics Express, vol. 9, no. 5, pp. 333-338 (2012)
Masanori Takeda, Saroj R. Tripathi, Makoto Aoki and Norihisa Hiromoto, "Random error in intensity spectrum measured with THz-TDS - No relation to the intensity flucutation of fs laser ", Advanced Materials Research , vol. 222, pp.213-216 (2011)
M. Aoki, S. R.Tripathi, M. Takeda and N. Hiromoto, ”THz passive imaging using high sensitive THz photoconductive detector" IEEJ issue on light application and visual science (LAV), vol. 24, pp. 27-31, 2010.
S. R.Tripathi, M. Aoki, M. Takeda and N. Hiromoto, ”Random error estimation in optical constants of sample with sharp absorption features measured by terahertz time domain spectroscopy" IEEJ issue on light application and visual science (LAV), vol. 24, pp. 55-60, 2010.
Saroj R. Tripathi, Makoto Aoki, Kento Mochizuki, Toshiaki Asahi, Iwao Hosako and Norihisa Hiromoto, "Properties and modeling of random errors in optical parameters measured with THz-TDS," Journal of Japan Society of Infrared Science and Technology. vol. 19, No. 1 & 2, pp. 77-84 (2010)
Saroj R. Tripathi, Makoto Aoki, Kento Mochizuki, Iwao Hosako, Toshiaki Asahi and Norihisa Hiromoto, “Practical method to estimate the standard deviation in absorption coefficients measured with THz time-domain spectroscopy,” Optics Communications, vol. 283, issue 12, pp. 2488-2491 (2010)
Saroj R. Tripathi, Makoto Aoki, Kento Mochizuki, Toshiaki Asahi, Iwao Hosako and Norihisa Hiromoto, “Random error estimation in refractive index measured with the terahertz time domain spectroscopy,” IEICE Electronics Express, vol. 6, no. 23, pp. 1690-1696 (2009)
Non-Refereed papers
S. R. Tripathi, S. Takahashi, K. Kinumura and K. Kawase, “Frequency of resonance of human sweat duct in different modes of operation” Proceedings of SPIE, Vol. 10492, 1049201- (1-5) , 2018
S. R. Tripathi, M. Aoki, T. Masanori, H. Hosako and N. Hiromoto, "Random error estimation in optical constants of sample with sharp absorption features measured by terahertz time domain spectroscopy" in proceeding of IEEJ workshop on light application and visual science (LAV), vol. 24, pp. 55-60 (2010)
M. Aoki, S. R. Tripathi, M. Takeda and N. Hiromoto , "THz passive imaging using high sensitive THz photoconductive detector " in proceeding of IEEJ workshop on light application and visual science (LAV), vol. 24, pp. 27-32 (2010)
Refereed International Conferences (Proceedings)
S. R. Tripathi and K. Kawase, “Investigation on resonating frequency of human sweat ducts in normal mode of operation” 41th international conference on Infrared, Millimeter and THz wave, H5P.02.05, Sept 25-30, 2016, Copenhagen, Denmark
K. Kawase and S. R. Tripathi*, "Morphological study of human sweat ducts forthe investigation of THz-wave interaction," SPIE Photonics west, BIOS 2016, Optical interactions with tissue and cells, XXVII (conference 9706), Paper No. 9706-8, The Moscone Center, San Francisco, USA, (Feb, 13-18, 2016). * Presenting author. (Invited)
M. Kato, R. Yamazaki, K. Murate, K. Imayama, S. R. Tripathi, K. Kawase, "Recognitionof chemicals concealed under covering substances using terahertz spectroscopybased on injection-seeded terahertz parametric source", The International Chemical Congress Of Pacific Basin Societies 2015 (Pacifichem 2015), ANYL991, Hawaii Convention Center on Waikiki Beach, Dec. 15-20, 2015, Hawaii, USA
S. R. Tripathi, E. Miyata, K. Kawase, "Role of human sweat duct interahertz wave interaction with human skin", The International Chemical Congress Of Pacific Basin Societies 2015 (Pacifichem 2015), ANYL880, Kona Moku Bllrm A - Marriott Waikiki Beach, Dec. 15-20, 2015, Hawaii, USA
K. Kawase, K. Murate, S.R. Tripathi, "THz parametric generation and applications" The 2015 Vacuum Electronics Meeting, T21, Las Vegas, USA (Nov. 21-24, 2015). (Invited)
S. R. Tripathi, E. Miyata and K. Kawase, “Role of human sweat ducts in interaction of terahertz wave with human skin” JSAP-OSA Joint Symposia 2015, 15p-2E-4, Sept. 13-16, 2015, Nagoya Congress Center, Nagoya, Japan
S. R. Tripathi, D. G. Valchev, “Signal windowing in terahertztime domain spectroscpy” JSAP-OSA Joint Symposia 2015, 15p-2E-5, Sept. 13-16, 2015, Nagoya Congress Center, Nagoya, Japan
Y. Sugiyama, S. R. Tripathi, K. Murate, K. Imayama, K. Kawase, “Development of 3D tomographic system using terahertz wave parametric source”, 2nd international symposium on Frontiers in THz technology (FTT 2015), pos. 2.29 st, Aug. 30-Sept. 2, 2015, Hamamatsu, Japan.
P. B. Isahi, S. R. Tripathi, K. Kawase, A. Puzenko, Y. Feldman, “The origin of water's dielectric excess wing” 40th International conference on Infrared, Millimeter and THz wave (IRMMW 2015), W3C-6, Aug. 23-28, 2015, Hongkong.
K. Kawase, R. Yamazaki and S. R. Tripathi, “THz non-destructive inspections include effluent gas filters” Laser Ignition Conference 2015 (LIC ’15), T4A.1, April 27-30, 2015, Argonne National Laboratory, Argonne, USA. (Invited)
S. R. Tripathi, E. Miyata and K. Kawase, “Structural parameters of human sweat ducts and their frequency of resonance in terahertz region” 6th international THz-Bio workshop (THz-Bio 2015), April 8-10, Seoul, S. Korea. (Invited)
K. Kawase, K. Murate, S. Hayashi, S. R. Tripathi “THz wave parametric amplifier” 6th international workshop on optical terahertz science and technology (OTST 2015), Mar. 8-13, 2015, San Diego USA. (Invited)
Y. Guan, M. Yamamoto, T. Kitazawa, S. R. Tripathi, K. Takeya and K. Kawase, “Development of THz barcode for security applications ” 6th international workshop on optical terahertz science and technology (OTST 2015), Mar. 8-13, 2015, San Diego, USA.
H. Okano, T. Minami, Y. Guan, S. R. Tripathi, K. Takeya, M. Tani and K. Kawase, “High power Cherenkov phase-matched terahertz wave generation from LiNbO3 ridge waveguide” 6th international workshop on optical terahertz science and technology (OTST 2015), Mar. 8-13, 2015, San Diego, USA.
K. Kawase, K. Murate, S. R. Tripathi, "Novel Techniques for THz-wave measurement" Advances in Live Cell Thermal Imaging and Manipulation (ALSCTIM2014), Nov. 9-12, 2014, OIST, Okinawa, Japan (Invited)
S. R. Tripathi, E. Miyata, H. Yamada and K. Kawase, “Morphological study of sweatducts for the investigation of terahertz waves interaction with human skin” 39th International conference on Infrared, Millimeter and THz wave, M4/D-8.9, Sept 14-19, 2014, Tucson , USA
K. Murate, S. R. Tripathi, Y. Taira, S. Hayashi, K. Nawata, H. Minamide and K. Kawase, “A Terahertz wave parametric ampflier with 55 dB gain” 39th International conference on Infrared, Millimeter and THz wave, R4/E-34.8, Sept 14-19, 2014, Tucson , USA
S. R. Tripathi, E. Miyata and K. Kawase, “Study on the density anddimension of human sweat ducts and their frequency of resonance” 31st URSI General Assembly and Scientific Symposium 2014 (URSI GASS 2014), K01.4, Aug. 16-23, 2014, Beijing, China
S. R. Tripathi, E. Miyata and K. Kawase, “Influence of dielectric properties of stratum corneum on resonating frequency of human sweat ducts” International Symposium on Frontier of Terahertz Science, Okinawa Institute of Science and Technology, Session 2- 23, Aug. 4-6, 2014,Okinawa, Japan
R. Yamazaki, K. Murate, K. Imayama, I. N. Smirnova, S. R. Tripathi and K. Kawase, “Transmission spectroscopy of chemicals concealed in shielding materials using injection-seeded terahertz wave parametric generator” International Symposium on Frontier of Terahertz Science, Session 2-15, Okinawa Institute of Science and Technology, Aug. 4-6, 2014, Okinawa, Japan.
K. Murate, Y. Taira. S.R. Tripathi, S. Hayashi, K. Nawata, H. Minamide, K. Kawase, “Frequency tunable, high dynamic range THz spectrometer using parametric processes in Lithium Niobate crystal” CLEO:2014, SF2F.6, June 8-13, 2014, San Jose, USA.
S. R. Tripathi, H. Yamada, E. Miyata and K. Kawase, “Determination of resonant frequency of human sweat duct based on the duct dimension obtained using optical coherence tomography” 1st Biomedical Imaging and Sensing Conference 2014 (BISC`14), BISC8-1, Apr. 22-24, 2014, Yokohama, Japan.
K. Murate, Y. Taira, S. R. Tripathi, S. Hayashi, K. Nawata, H. Minamide, T. Taira and Kodo Kawase “High dynamic range THz wave spectroscopic system using microchip Nd:YAG laser” The 2nd Laser Ignition Conference 2014 (LIC’14), LICp-3, Apr. 22-24, 2014, Yokohama, Japan.
Y. Taira, K. Murate, S. R. Tripathi, S. Hayashi, K. Nawata, H. Minamide, K. Kawase “Amplification of terahertz wave in Lithium Niobate Crystal“ 6th International Workshop on Terahertz Technology and Applications, No.14, March 10-11, Kaiserslautern, Germany.
K. Murate, Y. Taira, S. R. Tripathi, S. Hayashi, K. Nawata, H. Minamide, K. Kawase “Development of high dynamic range THz wave measurement system using nonlinear optical wavelength conversion in Lithium Niobate crystal“ 6th International Workshop on Terahertz Technology and Applications, No.15, March 10-11, Kaiserslautern, Germany.
K. Murate, Y. Taira, S. R. Tripathi, S. Hayashi, K. Nawata, H. Minamide, K. Kawase “Improvement of dynamic range in THz wave measurement system“ The 5th International Workshop on Far-Infrared Technologies 2014(IW-FIRT 2014), P-8, Mar. 5-7, 2014, Fukui, Japan.
S. R. Tripathi and Kodo Kawase, "High power terahertz wave sources and their practical applications”(Invited) International conference on optics and optoelectronics (ICOL 2014),IT-THT-02, March 5-8, 2014, IRDE, Dehradun, India.
K. Miyata, S.R. Tripathi, N. Nishizawa, K. Kawase "Determination of possible resonant frequency of human sweat ducts" International symposium on EcoTopia Science (ISETS 2013), P-8-4 (1067), 13-15 Dec. 2013, Nagoya, Japan.
S. R. Tripathi, T. Yuusuke, S. Hayashi, H. Minamide and K. Kawase, "Parametric amplification of terahertz waves in lithium niobate crystal" 38th international conference on infrared millimeter and terahertz waves (IRMMW THz 2013), 1-6 Sept, 2013, Mainz, Germany
N. Hiromoto, T. Nagashima, S. R. Tripathi, M. Takeda and M. Aoki, "Precise and convenient reflection THz-time domain spectroscopy with a movable transparent sample holder " 38th international conference on infrared millimeter and terahertz waves (IRMMW THz 2013), 1-6 Sept, 2013, Mainz, Germany
K. Kawase, S. Fan and S. R. Tripathi, "Efficient nonlinear optical THz sources using LiNbO3" International symposium on Microwave/Terahertz Science and Application (MTSA) 2013, T1-3, Shanghai Institute of Microsystem and Information Technology, Shanghai, China, (July 22-23, 2013). (Invited)
S. R. Tripathi, K. Murate, H. Uchida, K. Takeya and K. Kawase, “High average power and broadband THz wave generation scheme via optical rectification in 4-dimethylamino-N-methyl-4-stilbazolium tosylate crystal” The 10th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR 2013), WPC-17, Kyoto, Japan (30 June - 4 July, 2013)
K. Kawase, S. R. Tripathi and S. Hayashi, "Widely tunable THz sources and security applications," SPIE Conference on Terahertz Physics, Devices and System VII (SPIE DSS2013) 8716-15, Baltimore Convention Center, USA (Apr. 29 - May 3, 2013). (Invited)
S. R. Tripathi, T. Sugiyama, K. Murate, K. Takeya and K. Kawase, “Broad band and high power THz wave generation using femto second fiber laser in 4-dimethylamino-N-methyl-4-stilbazolium tosylate crystal” The 2nd Advanced lasers and Photon sources conference (ALPS’ 13), ALPS4-4, Pacifico Yokohama, Yokohama, Japan (Apr. 23- 25, 2013)
S. R. Tripathi, T. Sugiyama, H. Uchida, K. Takeya and K. Kawase, “High power terahertz wave generation via optical rectification of femtosecond pulses in DAST crystal” International Workshop on Optical Terahertz Science and Technology 2013 (OTST 2013), TU4-44, Kyoto Terrsa, Kyoto, Japan (Apr 1-4, 2013)
K. Kawase, S. R. Tripathi, S. Hayashi, "Nonlinear optical THz generation and applications" the international conference on fiber optics and photonics (Photonics 2012), T3A-1, Indian institute of technology, Madras, India, 9-12 Dec, 2012. (Invited)
S. R. Tripathi, K. Takeya, H. Inoue, T. Hasegawa and K. Kawase, Non-destructive inspection of chloride in concrete structures using millimeter wave attenuated total reflection, 37th international conference on infrared. millimeter and terahertz waves (IRMMW THz 2012), 23-28 Sept, 2012, Wollongong University, Wollongong, Australia.
K. Kawase, S.R. Tripathi, M. Yamaguchi，and S. Hayashi, "Tunable THz wave sources and real life applications", 7th Conference of the International Dielectric Society and 13th Conference on Dielectric & Related Phenomena, 3 – 7, Sept, 2012, Leipzig, Germany (Invited)
K. Kawase, S. Hayashi, S.R. Tripathi, "Nonlinear optical THz sources and applications", 3rd EOS Topical Meeting on Terahertz Science & Technology (TST 2012) 17 - 20 June 2012, Kaiserstejnsky Palace, Prague, Czech Republic (invited)
S. R. Tripathi, H. Ogura, H. Kawagoe, H. Inoue, T. Hasegawa, K. Takeya and K. Kawase, Measurement of chloride ion concentration in concrte using terahertz waves, The 4th International Workshop on Far-Infrared Technologies 2012 (IW-FIRT 2012), 7-9, March 2012, University of Fukui, Fukui, Japan
M. Yamaguchi, S. Katori, H. Ogura, L. Rang, S. R. Tripathi, K. Kawase, "Terahertz wave reflection measurement with mental and physical stimulus", The 4th International Workshop on Far-Infrared Technologies 2012 (IW-FIRT 2012), 7-9, March 2012, University of Fukui, Fukui, Japan
N. Hiromoto, M. Takeda, S. R. Tripathi, M. Aoki, "Property and origin of the random noise in the THz-TDS II", 4th Japan-Korea joint Workshop on Terahertz Technology, 19-20 Dec. 2011, Nagoya University, Japan.
M. Takeda, S. R. Tripathi, M. Aoki, K. Hirano, H. Ohtake, T. Hirosumi and N. Hiromoto, "Origin of intensity errors in THz-TDS masurement: Relation between beam deflection of the fs-laser and THz-intensity fluctuations", in proceedings of 36th International conference in Infrared, Millimeter and Terahertz Waves, Houston, Texas, USA, Oct. 2-7, 2011.
M. Aoki, S. R. Tripathi, M. Takeda and N. Hiromoto, "Passive imaging using a 4K-cryocooled THz photoconductive detector system with background-limited performance", in proceedings of 36th International conference in Infrared, Millimeter and Terahertz Waves, Houston, Texas, USA, Oct. 2-7, 2011.
N. Hiromoto, M. Takeda, S. R. Tripathi and M. Aoki, "Property and origin of the random noise in THz-TDS " Third Japan-Korea joint workshop on THz technology (Novtel Ambassador Hotel, Busan), Abstract of 3rd Japan-korea Joint WS THz Tech., p1-10, 17 Dec. 2010.
Saroj R. Tripathi, Makoto Aoki, Toshiaki Asahi, Iwao Hosako and Norihisa Hiromoto, "Accurate optical constants of ZnTe measured by THz-TDS with their standard deviations," in proceedings of 35th International Conference in Infrared, Millimeter and Teraherz Waves, Rome, Italy, Sept. 5-10, 2010
Makoto Aoki, Saroj R. Tripathi and Norihisa Hiromoto, "Investigation of reflection-type cone condenser used for THz detectors," in proceedings of 35th International Conference in Infrared, Millimeter and Teraherz Waves, Rome, Italy, Sept. 5-10, 2010
Masanori Takeda, Saroj R. Tripathi, Makoto Aoki and Norihisa Hiromoto, "Exploration of the origin of random error in spectrum intensity measured with THz-TDS, " in proceedings of 35th International Conference in Infrared, Millimeter and Teraherz Waves, Rome, Italy, Sept. 5-10, 2010
Norihisa Hiromoto, Saroj R. Tripathi, Masanori Takeda and Makoto Aoki, " Study on Random Errors in THz Signal and Optical Constants Observed with THz Time-Domain Spectroscopy " in proceedings of 35th International Conference in Infrared, Millimeter and Teraherz Waves, Rome, Italy, Sept. 5-10, 2010
Masanori Takeda, Saroj R. Tripathi, Makoto Aoki and Norihisa Hiromoto, " Random error in intensity spectrum measured with THz-TDS - No relation to the intensity flucutation of fs laser -" in proceeding of 9th International conference in global research and education (Interacademia 2010), Riga, Latvia, Aug. 9-12, 2010
Norihisa Hiromoto, Saroj R. Tripathi, Makoto Aoki, Kento Mochizuki, Toshiaki Asahi, Iwao Hosako, “Efficient method for estimating random errors in optical constants measured with THz-TDS,” in proceeding of 2010 CLEO/QELS conference, San Jose, USA. May 16-21, 2010.
Saroj R. Tripathi, Makoto Aoki, Kento Mochizuki, Iwao Hosako, Toshiaki Asahi, and Norihisa Hiromoto, “Comparison of random errors with dynamic range in the optical parameters of ZnTe measured by THz-TDS,” In proceedings of 34th International Conference in Infrared, Millimeter and Terahertz Waves, Busan, Korea, Sept. 21-25, 2009
Aoki, K. Mochizuki, S. R. Tripathi, K. Watanabe, H. Murakami, M. Wakaki and N. Hiromoto, “Background-Limited operation of 4K-Cryocooled THz photoconductive detector system with a wide frequency range of 0.8 to 4THz,” In proceedings of 34th International Conference in Infrared, Millimeter and Terahertz Waves, Busan, Korea, Sept. 21-25, 2009. (Invited)
K. Mochizuki, M. Aoki, S. R. Tripathi and N. Hiromoto, “ Polarization changeable THz time-domain spectroscopy system with a small incident-angle beam-splitter,” In proceedings of 34th International Conference in Infrared, Millimeter and Terahertz Waves, Busan, Korea, Sept. 21-25, 2009.
Norihisa Hiromoto, Makoto Aoki, Saroj R. Tripathi, Kosei Hasiguchi and Kento Mochizuki, “ Study on high performance and convenient terahertz detectors,” In proceedings of 7th international conference on global research and education (Interacademia-2008), Pecs, Hungary, Sept. 15-18, 2008.
Saroj R. Tripathi, Makoto Aoki, Norihisa Hiromoto, Iwao Hosako, and Toshiaki Asahi, “Relation between optical characteristics of ZnTe and its emitter/detector performance in THz-TDS,” In proceedings of 2nd Inter-Academia for Young Researchers Workshop, Hamamatsu, Japan, Sept. 26-30, 2007.
Domestic Conferences (Japan)
Saroj R. Tripathi, Makoto Aoki, Masanori Takeda, Iwao Hosako and Norihisa Hirotmoto, "Random error estimation in dielectric properties of α-lactose monohydrate measured by THz-TDS," The 2010 IEICE Society Conference, C-4-26, Osaka Prefectural university, Oosaka, Sept. 14-17, 2010.
Saroj R. Tripathi, Makoto Aoki, Kento Mochizuki, Iwao Hosako, Toshiaki Asahi and Norihisa Hiromoto, “Estimation of random error in refractive index measured by THz-TDS,” The 2009 IEICE General Conference, C-4-2, Tohoku University, Sendai, Mar.16-19, 2010.
Saroj R. Tripathi, Makoto Aoki, Kento Mochizuki, Iwao Hosako, Toshiaki Asahi and Norihisa Hiromoto, “Evaluation of standard deviation in phase and real refractive index measured with terahertz time-domain spectroscopy (THz-TDS),” 57h Spring Meeting of Japan Society of Applied Physics, 19p-L-15, Tokai University, Kanagawa, Mar. 17-20, 2010.
Saroj R. Tripathi, Makoto Aoki, Kento Mochizuki, Toshiaki Asahi, Iwao Hosako and Norihisa Hiromoto, “Estimation of standard deviation in optical constants measured by THz-TDS,” 19th Conference on Japan Society of Infrared Science and Technology, 2009IR-19 (P-8), JAXA, Kanagawa, Nov. 5-6, 2009.
Saroj R. Tripathi, M. Aoki, K. Mochizuki, I. Hosako, T. Asahi and N. Hiromoto, “A Novel method of standard deviation estimation of optical parameters measured with THz-TDS,” The 2009 IEICE Society Conference, C-4-6, Niigata University, Niigata, Sept. 15-18, 2009.
Saroj R. Tripathi, M. Aoki, K. Mochizuki, I. Hosako, T. Asahi and N. Hiromoto, “Evaluation methods of standard deviation in optical constants measured by THz-TDS,” 70th Autumn Meeting of Japan Society of Applied Physics, 9p-M-1, Toyama University, Toyama, Sept. 8-11, 2009.
Saroj R. Tripathi, Makoto Aoki, Kento Mochizuki, Norihisa Hiromoto, Iwao Hosako, Asahi Toshiaki, “Reliability of optical parameters of ZnTe crystal measured by THz-TDS,” 18th Conference on Japan Society of Infrared Science and Technology, C-6, Kobe University, Kobe, Oct. 30-31, 2008.
Saroj R. Tripathi, Makoto Aoki, Kento Mochizuki, Norihisa Hiromoto, Iwao Hosako, Asahi Toshiaki, “Examination of accuracy in optical parameters of ZnTe measured by THz-TDS,” 69th Autumn Meeting of Japan Society of Applied Physics, 5a-ZE-8, Chubu university, Nagoya, Sept. 2-5, 2008.
Saroj R. Tripathi, Makoto Aoki, Norihisa Hiromoto, Iwao Hosako, Toshiaki Asahi, “Dielectric properties of ZnTe crystal and its use in T-ray emission and detection,” The 2008 IEICE General Conference, C-4-12, Kitakyushu Science and Research Park, Kyushu, Mar. 18-21, 2008.
Saroj. R. Tripathi, M. Aoki, N. Hiromoto, I. Hosako, and T. Asahi, “Optical characteristics of ZnTe crystal and its use in THz-TDS as THz detector,” 17th conference on Japan Society of Infrared Science and Technology, 2007-IR-17, Tokyo Institute of Technology, Yokohama, Nov. 14-15, 2008.
Saroj R. Tripathi, Makoto Aoki, Norihisa Hiromoto, Iwao Hosako, Toshiaki Asahi, “THz performance of ZnTe and its emitter/detector characteristics in THz-TDS,” 68th Autumn Meeting of Japan Society of Applied Physics, 6p-ZB-11, Hokkaido Institute of technology, Sapporo, Sept, 4-8, 2007.
Saroj R. Tripathi and Y. Kuwahara, "Microwave imaging: Discrimination of breast cancer and abscess," The 2007 IEICE General Conference, Meijo University, Nagoya, 20-23 Mar. 2007.
Saroj R. Tripathi and Y. Kuwahara, "A consideration of space time beamforming in microwave imaging," The 2006 IEICE Society Conference, Kanazawa University, Kanazawa, 19-22 Sept., 2006
Contributed Works (Domestic conferences, Japan)
Takeda Masanori, Kento Mochizuki, Saroj R. Tripathi, Makoto Aoki, and Norihisa Hiromoto, “Random error in intensity spectrum measured with THz-TDS - Relation to the intensity variation of fs-laser,” 57h Spring Meeting of Japan Society of Applied Physics, 19p-L-17, Tokai University, Kanagawa, Mar. 17-20, 2010.
Makoto Aoki, Kento Mochizuki, Saroj R. Tripathi and Norihisa Hiromoto, “Lightly stressed Gallium-doped Germanium terahertz photoconductor,” 57h Spring Meeting of Japan Society of Applied Physics, 18a-M-10, Tokai University, Kanagawa, Mar. 17-20, 2010.
Makoto Aoki, Tripathi Saroj R., Kento Mochizuki, Norihisa Hiromoto, Kentaroh Watanabe, Hiroshi Murakami, Moriaki Wakaki, “Development of 4K-cryocooled multiband THz photoconductive detector system,” 19th Conference on Japan Society of Infrared Science and Technology, 2009IR-23, JAXA, Kanagawa, Nov. 5-6, 2009.
Kento Mochizuki, Makoto Aoki, Tripathi Saroj R., Norihisa Hiromoto, “Reflection-mode THz time-domain spectroscopy system for reflection measurement with polarization,” 19th Conference on Japan Society of Infrared Science and Technology, 2009IR-16, JAXA, Kanagawa, Nov. 5-6, 2009.
Kento Mochizuki, Makoto Aoki, Tripathi Saroj R., Norihisa Hiromoto, “Reflection-mode THz time-domain spectroscopy system with a small incident-angle beam-splitter,” The 6th Korean – Japanese Student Workshop, Shizuoka University, Hamamatsu, Oct. 29-30, 2009.
Makoto Aoki, Kento Mochizuki, Tripathi Saroj R., Kentaroh Watanabe, Hiroshi Murakami, Moriaki Wakaki, Norihisa Hiromoto, “Background-limited operation of 4K-cryocolled THz photoconductive detector system with a wide frequency range of 0.8 to 4 THz,” The 2009 IEICE Society Conference, C-4-5, Niigata University, Niigata, Sept. 15-18, 2009.
Makoto Aoki, Kento Mochizuki, Tripathi Saroj R., Norihisa Hiromoto, Kentaroh Watanabe, Hiroshi Murakami, Moriaki Wakaki, Investigation of reflection-type cone condenser used for high sensitive THz detectors, 70th Autumn Meeting of Japan Society of Applied Physics, 8p-M-6, Toyama University, Toyama, Sept. 8-11, 2009.
Kento Mochizuki, Makoto Aoki, Tripathi Saroj R., Norihisa Hiromoto, “Reflection-mode terahertz time-domain spectroscopy system using reference waves reflected at two surface of dielectric plate, 70th Autumn Meeting of Japan Society of Applied Physics, 9p-M-11, Toyama University, Toyama, Sept. 8-11, 2009.
Kento Mochizuki, Makoto Aoki, Tripathi Saroj R., Norihisa Hiromoto, “Evaluation of polarized THz signal for the THz-TDS adequate to polarization measurements,” The 56th Spring Meeting of the Japan Society of Applied Physics, 31p-P10-15, Tsukuba University, Tsukuba, Mar.30- Apr. 2, 2009.
Makoto Aoki, Kento Mochizuki, Tripathi Saroj R., Kentaroh Watanabe, Hiroshi Murakami, Moriaki Wakaki, Norihisa Hiromoto, “Triangle cone condenser for high sensitive THz photoconductive semiconductor detector system,” The 56th Spring Meeting of the Japan Society of Applied Physics, 30p-P10-15, Tsukuba University, Tsukuba, Mar.30- Apr. 2, 2009.
Makoto Aoki, Tripathi Saroj R., Kento Mochizuki, Norihisa Hiromoto, “THz photoconductive semiconductor detector system with a 4K cryocooler, The 10th Takayanagi Kenjiro Memorial Symposium and The 5th International Symposium on Nanovision Science, Shizuoka University, Hamamatsu, Nov, 17-18, 2008.
Kento Mochizuki, Makoto Aoki, Tripathi Saroj R., Norihisa Hiromoto, “Configuration of THz-TDS for reflection measurement with polarization,” The 18th conference of the Japan Society of Infrared Science and Technology, C-5, Kobe University, Kobe, Oct. 30-31, 2008.
Makoto Aoki, Tripathi Saroj R., Kento Mochizuki, Norihisa Hiromoto, “THz photoconductive semiconductor detector system with a 4K cryocooler for sensing on the ground,” The 4th Korean-Japanese-Chinese Student Workshop, Pusan University, Busan, Korea, Oct. 29-31, 2008.
Kento Mochizuki, Makoto Aoki, Tripathi Saroj R., Norihisa Hiromoto, “Construction of THz-TDS for polarization dependence reflection measurement,” 69th Autumn Meeting of Japan Society of Applied physics, 5a-ZE-2, Chubu University, Nagoya, Sept. 2-5, 2008.
Makoto Aoki, Kento Mochizuki, Tripathi Saroj R., Norihisa Hiromoto, Kentaroh Watanabe, Hiroshi Murakami, Moriaki Wakaki, “Vibrational noise of THz photoconductive semiconductor detector system with a 4K Cryocooler for sensing on the ground,” 69th Autumn Meeting of Japan Society of Applied Physics, 3p-ZE-13, Chubu University, Nagoya, Sept. 2-5, 2008.
Makoto Aoki, Tripathi Saroj R., Norihisa Hiromoto, Kentaroh Watanabe, Hiroshi Murakami, Moriaki Wakaki, “High sensitive THz detection system with a 4K Cryocooler and THz photoconductive semiconductors,” The 2008 IEICE General Conference, C-4-11, Kitakyushu Science and Research Park, Kyushu, Mar. 18-21, 2008.
Makoto Aoki, Tripathi Saroj R., Norihisa Hiromoto, Kentaroh Watanabe, Hiroshi Murakami, Moriaki Wakaki, “THz photoconductive semiconductor detectors with a 4K Cryocooler for sensing on the ground II”, The 55th spring meeting of the Japan Society of Applied Physics, 28a-ZH-10, Nihon University, Chiba, Mar. 27-30, 2008.
Makoto Aoki, Tripathi Saroj R., Norihisa Hiromoto, Kentaroh Watanabe, Hiroshi Murakami, Moriaki Wakaki, “THz photoconductive semiconductor detector system with a 4K Cryocooler,” 17th conference on Japan Society of Infrared Science and Technology, 2007-IR-16, Tokyo Institute of Technology, Yokohama, Nov. 14-15, 2007.
Makoto Aoki, Tripathi Saroj R., Norihisa Hiromoto, Kentaroh Watanabe, Hiroshi Murakami, Moriaki Wakaki, “THz photoconductive semiconductor detectors with a 4K Cryocooler for sensing on the ground,” 68th autumn meeting of Japan Society of Applied Physics, 7a-ZB-1, Hokkaido Institute of Technology, Sapporo, Sept. 4-8, 2007.