Welcome to LEE's Research Group

Convergence Physics Lab. (CPL)

Our group focuses on the interaction of electromagnetic waves with media in the radio-frequency(RF)/microwave region, i.e., 300 MHz to 300 GHz. Based on the primary research, we study convergence research for real-time and continuous bio-matertials, and gas-molecules sensing platforms associated with RF/microwave components and systems. We also research and develop micro-and nano-scaled planar resonators and antennas, metamaterials, and metasurfaces for enhancing the sensing performance. In addition, we investigate RF/microwave characterization of carbon nanomaterials, including graphene, graphene oxide, and carbon nanofibers, for developing electromagnetic absorbing materials. These studies are based on circuit modeling and 2.5 D and 3D full-wave electromagnetic simulation. For this reason, graduate (or undergraduate) students/researchers having a robust background, such as physics (esp. classical mechanics, electromagnetics, quantum mechanics, optics, solid-state physics, photonics), chemistry (esp. organic & inorganic chemistry), mathematics (esp. vector analysis, linear algebra, partial differential equations, complex analysis, numerical analysis), biomedical engineering (esp. biosensors, biomechanics), mechanical engineering (esp. microfluidics, computational fluid dynamics), and electrical and electronic engineering (esp. microwave engineering, radio-frequency/microwave electronics, antennas theory and design, computational electromagnetic dynamics) are always welcome.
Feel free to contact me if you are interested in our research/collaborating work.

In our lab,  opening positions for internship (Under), graduate student (M.S., Ph.D. or combined M.S.& Ph.D.) student and Post-doctor who are interested in research topics as follows:

2.5D and 3D full-wave electromagnetic simulation (e.g., FEKO, HFSS, COMSOL) for radio-frequency/microwave devices and circuits design and analysis.
Design, fabrication, and measurement for radio-frequency/microwave bio-material and gas-molecule sensing devices and circuits.
Design, fabrication, and measurement for  radio-frequency/microwave micro-devices and circuits using a silver-inkjet printing technique.
Design, fabrication, and measurement for  radio-frequency/microwave devices and circuits with carbon nanomaterials (e.g., carbon nanofiber, carbon nanotube, and graphene).
First, send your CV (including English level) to me by e-mail (hjlee@daegu.ac.kr) if you are interested in our lab.

Latest News:

Last July 2024y, Prof. Lee visited for collaborating research in Prof. Zarifi's group, School of Engineering, Faculty of Applied Science at UBC, Canada. His team is a leading group of microwave sensors and their application field in Canada as well as Worldwide.
Phys.org, an online science, research, and technology news, introduced the collaborative research of Prof. Lee and Prof. Rho's group (POSTECH)-[Related Link]

Latest Publication & Talk:

Hee-Jo Lee and Jong-Gwan Yook, "Biosensing using split-ring resonators at microwave regime," Applied Physics Letters, Vol. 92, No. 25, pp. 254103(13), June 2008. This paper related to metamaterial-based biosensing was cited more than 300 times (Ref. date: Dec. 31, 2023).
[Invited Talk]-Hee-Jo Lee, "Ultra-broadband electromangetic wave absorber based on multi-layer metasurfaces," European Advanced Materials Congress 2025, Stockholm, Sweden, Aug. 18-20,  2025
Seokho Lee, Kyungtae Kim, Younghwan Yang, Junhwa Seong, Chunghwan Jung, Hee-Jo Lee*, and Junsuk Rho*, "Deep learning-driven robust glucose sensing and fruit Brix estimation using a single microwave split ring resonator,"  Laser and Photonics Reviews,  Vol.18, No.8, pp. 2300768(1-8), Aug. 2024 (*Co-Corresponding Author) 
Haneul Woo, Hee-Jo Lee, and Jong-Gwan Yook, "Non-invasive detection of glucose and NaCl solutions with environment correction using a dual IDC-based microwave sensor,"  IEEE Sensors Journal, Vol.24, No. 12, pp. 19039-19049, June 2024
Hee-Jo Lee*, Debasish Kumar Dey, and Sun Chul Kang*, "Transmission properties of microwave multi-resonant modes to pathogenic bacteria and their discrimination,"  IEEE Sensors Journal, Vol.24, No. 1, pp. 9982-9988, Apr. 2024   (* Co-Corresponding Author)
[Invited Talk]-Hee-Jo Lee, "Resonator-based biosensing at RF/microwave regime: from biomolecule to cell detection," Bioelectrodynamics Webinar, Institution of Photonics and Electronics of the Czech Academy of Sciences, Czech Republic, Jan. 22, 2024-[Related Seminar Link]
[Invited Talk]-Hee-Jo Lee, "Biosensing and graphene characterization at RF/microwave regime," Samsung Electronics-Electromagnetic Waves Workshop 2023, Yongin, Gyeonggi, June 30, 2023
Hee-Jo Lee*, Ji Hwan Jeong, Nathan Jeong, and Bo-Hye Kim*, "High-frequency transmission properties of carbon nanofibers with carbonization temperature variations," Applied Materials Today, Vol. 35, pp. 101989 (1-8), Dec. 2023   (* Co-Corresponding Author)
Hyo Chan Lee, Hee-Jo Lee, and Bo-Hye Kim, "Effect of B2O3 on the structure, morphology, and electrochemical properties of hierarchical multilayer carbon nanofiber/MnO2/carbon nanofiber composites," Electrochimica Acta, Vol. 471, pp.143376-1-143376-9, Dec. 2023
[Invited Talk]-Hee-Jo Lee, "Microwave absorbing properties of carbon nanofibers with different carbonization temperatures at the coplanar waveguide circuit," Advanced Materials World Congress 2022, Oct. 11-14, Stockholm, Sweden 2022
[Invited Talk]-Hee-Jo Lee, "Graphene characterization for microwave electronic devices and circuits,"   European Advanced Materials Congress, June 25-July 2, Genoa, Italy 2022. And prof. Lee has been admitted as a IAAM Scientist Medal in recognition for his contribution to "Graphene-Fabrication, characterization, and applications".
Nathan Jeong, Sangkil Kim, Hee-Jo Lee, and Jae Hee Kim "Wireless charging of a metal-encased device," IEEE Transactions on Antennas and Propagation, Vol. 70, No. 1, pp. 654-663, Jan. 2022
Hee-Jo Lee, Sangkil Kim, and Young-Pyo Hong, "On the optimal modes for glucose droplet sensing based on multi-modes," IEEE Sensors Journal, Vol. 21, No. 21, pp. 24048-24055, Nov. 2021
Chorom Jang, Jin-Kwan Park, Hee-Jo Lee, Gi-Ho Yun, and Jong-Gwan Yook, "Sensitivity-enhanced fluidic glucose sensor based on a microwave resonator coupled with an interferometric system for noninvasive and continuous detection," IEEE Transactions on Biomedical Circuits and Systems, Vol. 15, No. 5, pp. 1017-1026, Oct. 2021  
Ji Hwan Jeong, Hee-Jo Lee, Myung Hwa Kim, and Bo-Hye Kim, "Study on the tubular nanostructured electrode of MnO2-core/carbon nanofiber-shell for electrochemical capacitors," ACS Applied Energy Materials, Vol. 4, No. 10, pp. 10505-10513, Oct. 2021
Minkyung Kim, Dasol Lee, Thi Hai-Yen Nguyen, Hee-Jo Lee, Gangil Byun, and Junsuk Rho, "Total reflection-induced efficiency enhancement of the spin Hall effect of light," ACS Photonics, Vol. 8, No. 9, pp. 2705-2712, Sep. 2021
Younghwan Yang, Taejun Lee, Minkyung Kim, Chunghwan Jung, Trevon Badloe, Dasol Lee, Seokho Lee, Hee-Jo Lee, and Junsuk Rho, "Dynamic optical spin Hall effect in chitosan-coated all-dielectric metamaterials for a biosensing platform," IEEE Journal of Selected Topics in Quantum Electronics, Vol. 27, No. 5, pp. 1-8, May 2021
Chorom Jang*, Hee-Jo Lee*, and Jong-Gwan Yook. “Radio-frequency biosensors for real-time and continuous glucose detection,” Sensors, Vol. 21, No. 5, pp. 1843(1)-1843(21), Mar. 2021 (* Co-First Author)-[Review]
Hee-Jo Lee, "Recent progress in radio-frequency sensing platforms with graphene/graphene oxide for wireless healthcare system," Applied Sciences, Vol.11, No.5, pp. 2291(1)-2291(15), Mar. 2021-[Review] [Invited Feature Paper]
Hee-Jo Lee, Ji Hwan Jeong, and Bo-Hye Kim, "Microwave transmission characteristics of carbon nanofiber films with different micrometer-scale thickness," Carbon, Vol. 173, pp. 419-426, Mar. 2021

Contact Information:

Dr. & Prof. Hee-Jo Lee (E-mail: hjlee@daegu.ac.kr)
Convergence Physics Lab., Department of Physics Education, College of Education, Daegu Univ., Gyeongsan, Gyeongbuk 38453 South Korea

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