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We investigate strong light–matter interactions in resonant semiconductor and plasmonic nanostructures. By exploiting resonance-enhanced photothermal nonlinearities, we aim to control nanoscale scattering and absorption for applications in all-optical switching and super-resolution imaging. Particular emphasis is placed on Mie-resonant semiconductor nanostructures, where strong optical absorption and temperature-dependent optical properties can produce pronounced thermo-optic responses.
Y.-L. Tang, T.-H. Yen, K. Nishida, J. Takahara, T. Zhang, X. Li, K. Fujita, and S.-W. Chu*, “Mie-enhanced photothermal/thermo-optic nonlinearity and super-resolution imaging” Opt. Mat. Express 11, 3608-3626 (2021). Invited Review, top downloads in 2021 Nov-Dec.
Study of nonlinear response in plasmonic or semiconductor nanostructures
M. P. Vikram, K. Nishida, C.-H. Li, D. Riabov, O. Pashina, Y.-L. Tang, S. V. Makarov, J. Takahara, M. I. Petrov*, and S.-W. Chu* “Photo-thermo-optical modulation of Raman scattering from Mie-resonant silicon nanostructures” Nanophotonics. 2024 published online
H. Lee, S. Im, C. Lee, H. Lee, S.-W. Chu, A H.-P. Ho, and D. Kim*, “Probing temperature-induced plasmonic nonlinearity: unveiling opto-thermal effects on light absorption and near-field enhancement” Nano Lett. 24, 3598 (2024) inside Cover
K. Nishida, P.-H. Tseng, Y.-C. Chen, P.-H. Wu, C.-Y. Yang, J.-H. Yang, W.-R. Chen, O. Pashina, M. Petrov, K.-P. Chen,* and S.-W. Chu*, ”Optical bistability in nanosilicon with record low Q-factor” Nano Lett. 23, 11727 (2023)
X. Li, G.-J. Huang, and S.-W. Chu*, “The rise of Mie-tronics-based nonlinear scattering imaging” Laser Photon. Rev., 2200029 (2023) invited contribution in “Roadmap on Label-Free Super-Resolution Imaging”, article #19.
H.-Y. Cheng, M.-J. Ye, W.-R. Chen, C.-Y. Yang, S.-W. Chu, K.-P. Chen*, and K.-H. Lin*, “Large Optical Modulation of Dielectric Huygens’ Metasurface Absorber”, Adv. Opt. Mater. 11, 2370030, (2023) inside cover
K. Nishida, K. Sasai, R. Xu, T.-H. Yen, Y.-L. Tang, J. Takahara*, and S.-W. Chu*, ”All-optical scattering control in an all-dielectric quasi-perfect absorbing Huygens' metasurface” Nanophotonics 12, 139–146 (2023)
G.-J. Huang, H.-Y. Cheng, Y.-L. Tang, H. Ikuto, J. Takahara, K.-H. Lin*, and S.-W. Chu*, “Transient Super-/Sub-linear Nonlinearities in Silicon Nanostructures” Adv. Opt. Mater., 2101711 (2022), inside Cover, reported by Wiley Advanced Science News, 微信公众号《化学与材料科学》, selected by Optics and Photonics News as “Optics in 2022”. 中研院2022《研究成果選輯》
C.-H. Li, Y.-L. Tang, J. Takahara, and S.-W. Chu*, “Nonlinear heating and scattering in a single crystalline silicon nanostructure” J. Chem. Phys. 155, 204202 (2021), invited by a special issue “Chemical Imaging”.
Y.-S. Duh, Y. Nagasaki, Y.-L. Tang, P.-H. Wu, H.-Y. Cheng, T.-H Yen, H.-X. Ding, K. Nishida, I. Hotta, J.-H. Yang, Y.-P. Lo, K.-P. Chen, K. Fujita, C.-W. Chang, K.-H. Lin, J. Takahara, and S.-W. Chu*, “Giant photothermal nonlinearity in single silicon nanostructure,” Nat. Comm. 11, 4101 (2020).
K. Nishida, G. Deka, N. I. Smith, S.-W. Chu*, and K. Fujita*, “Using nonlinear scattering of near-infrared light for imaging plasmonic nanoparticles in deep tissue” ACS Photon. 7, 2139–2146 (2020).
T. C. Jagadale, D. Murali, and S.-W. Chu*, “Determination of nonlinear absorption and scattering in a single plasmonic nanostructure using X-scan technique” Beilstein J. Nanotech. 10, 2182–2191 (2019). Invited to special issue “Optically and electrically driven nanoantennas". .
Y. Sivan* and S.-W. Chu*, “Nonlinear plasmonics at high temperatures,” Nanophotonics 6, 317-328 (2017)
Y.-T. Chen, P.-H. Lee, P.-T. Shen, J. Launer, R. Oketani, K.-Y. Li, Y.-T, Huang, K. Masui, S. Shoji, K. Fujita, and S.-W. Chu*, “Study of nonlinear plasmonic scattering in metallic nanoparticles” ACS Photon. 3, 1432–1439 (2016).
S.-W. Chu*, H.-Y. Wu, Y.-T. Huang, T.-Y. Su, H. Lee, Y. Yonemaru, M. Yamanaka, R. Oketani, S. Kawata, S. Kawata, and K. Fujita, “Saturation and reverse saturation of scattering in a single plasmonic nanoparticle,” ACS Photon. 1, 32–37(2014) Highlighted by Nature Photonics.
Super-resolution microscopy based on nonlinear scattering
Y.-A. Chen, T.-H. Yen, C.-Y. Yang, J.-J. Chen, C.W. Chang, K. Nishida, S.-W. Chu*, "Super-resolution imaging of resonance modes in semiconductor nanowires by detecting photothermal nonlinear scattering." Nanophotonics, 14 4565-4573 (2025).
Y. Che, T. Zhang, X. Liu, D. Hu, S. Song, Y. Cai, Y. Cao, J. Zhang, S.-W. Chu, and X. Li, “Nanophotonic inspection of deep-subwavelength integrated optoelectronic chips.” Sci. Adv. 11, eadr8427 (2025).
Y.-L. Tang, T.-H. Yen, K. Nishida, C.-H. Li, Y.-C. Chen, T. Zhang, C.-K. Pai, K.-P. Chen, X. Li*, J. Takahara*, and S.-W. Chu*, “Multipole engineering by displacement resonance: a new degree of freedom of Mie resonance” Nat. Comm. 14, 7213 (2023)
Y.-C. Huang, T.-H. Chen, J.-Y. Juo, S.-W. Chu, and C.-H. Hsieh*, “Imaging of Single Light-Absorbing Nanoparticles by Widefield Interferometric Photothermal Microscopy” ACS Photon. 8, 592–602 (2021).
T. Zhang, Y. Che, K. Chen, J. Xu, Y. Xu, T. Wen, G. Lu, X. Liu, C. Wei, B. Wang, J. Han, Y. Cao, B. Guan, S.-W. Chu*, X. Li*, “Anapole Mediated Giant Photothermal Nonlinearity for Super-Localization Nanoscopy” Nat Comm. 11, 3027 (2020)
T. C. Jagadale and S.-W. Chu*, “Super-resolution imaging based on nonlinear plasmonic scattering” in Label-Free Super-Resolution Microscopy, V. Astratov ed., Springer (2019)
G. Deka, K. Nishida, K. Mochizuki, H.-X. Ding, K. Fujita*, and S.-W. Chu*, “Resolution enhancement in deep-tissue nanoparticle imaging based on plasmonic saturated excitation microscopy” APL Photonics 3, 031301 (2018).
G. Deka, C.-K. Sun, K. Fujita, and S.-W. Chu*, “Nonlinear plasmonic imaging techniques and their biological applications,” Nanophotonics 6, 31-49 (2017). invited review
H.-Y. Wu, Y.-T. Huang, P.-T. Shen, H. Lee, R. Oketani, Y. Yonemaru, M. Yamanaka, S. Shoji, S. Kawata, C.-W. Chang, K.-H. Lin, K. Fujita, and S.-W. Chu*, “Ultrasmall all-optical plasmonic switch and its application to superresolution imaging,” Sci. Rep. 6, 24293 (2016). Highlighted by SPIE Newsroom.
H. Lee, K.Y. Li, Y.-T. Huang, P.-T. Shen, G. Deka, R. Oketani, Y. Yonemaru, M. Yamanaka, K. Fujita, and S.-W. Chu*, “Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle,” J. Vis. Exp. (107), e53338, doi:10.3791/53338 (2016).
H. Lee, R. Oketani, Y.-T. Huang, K.-Y. Li, Y. Yonemaru, M. Yamanaka, S. Kawata, K. Fujita, and S.-W. Chu*, “Point spread function analysis with saturable and reverse saturable scattering,” Opt. Express 22, 26016-26022 (2014); been selected for Virtual Journal for Biomedical Optics.
S.-W. Chu*, T.-Y. Su, R. Oketani, Y.-T. Huang, H.-Y. Wu, Y. Yonemaru, M. Yamanaka, H. Lee, G.-Y. Zhuo, M.-Y. Lee, S. Kawata, and K. Fujita, “Measurement of a Saturated Emission of Optical Radiation from Gold Nanoparticles: Application to an Ultrahigh Resolution Microscope,” Phys. Rev. Lett. 112, 017402 (2014). Highlighted by APS Physics website
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