Abstract
Electromagnetically induced transparency (EIT) phenomenon is observed in simple metamaterial which consists of concentric double U-shaped resonators (USRs). The numerical and theoretical analysis reveals that EIT arises from the bright-bright mode coupling. The transmission spectra at different polarization angle of incident light shows that EIT transparency window is polarization sensitive. More interestingly, Fano resonance appears in the transmission spectrum at certain polarization angles. The sharp and asymmetric Fano lineshape is high valuable for sensing. The performance of sensor is investigated and the sensitivity is high up to 327 GHz/RIU. Furthermore, active control of EIT window is realized by incorporating photosensitive silicon. The proposed USR structure is simple and compact, which may find significant applications in tunable integrated devices such as biosensor, filters, and THz modulators.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 11104200) and the Natural Science Foundation of Tianjin (No. 18JCYBJC17000).
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Kun Ren received the M.S. degree in physics from Beijing Normal University, Beijing, China, and received the Ph.D. degree in physics from Institute of Physics, Chinese Academy of Sciences, Beijing, China. She joined Tianjin University in 2007, where she is currently an associate professor at College of Precision Instrument and Opto-electronics Engineering. From 2014 to 2015, she was a Visiting Scholar at Imperial College London, UK. Her main research interests include metamaterials, plasmonics, photonic crystals, nonlinear optics. She is the author or coauthor of more than 50 refereed journal papers.
Ying Zhang is currently working toward the M.S. degree at Tianjin University.
Xiaobin Ren received the Ph.D. degree from Beijing Normal University, Beijing, China. He is currently an associate professor at the School of Science, Tianjin University of Science and Technology, Tianjin, China. From 2014 to 2015, he was a Visiting Scholar at King’s College, London, UK. His research interests include surface plasmas optics, photonic crystals, optical materials and optical technologies.
Yumeng He is currently working toward the M.S. degree at Tianjin University.
Qun Han received the M.S. degree in optics from Nankai University, Tianjin, China, in 2003, and the Ph.D. degree in physical electronics from Tianjin University, Tianjin, China, in 2006.
Since 2006, he has been with the College of Precision Instruments and Opto-electronics Engineering, Tianjin University, where he is now an associate professor. From 2011 to 2012, he was a Visiting Scholar at Missouri University of Science and Technology, Missouri, USA. His current research interests include fiber lasers and amplifiers, fiber sensors, and optical materials. He is the author or coauthor of more than 100 journal papers.
Dr. Han is a member of the Optical Society of America.
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Ren, K., Zhang, Y., Ren, X. et al. Polarization-sensitive and active controllable electromagnetically induced transparency in U-shaped terahertz metamaterials. Front. Optoelectron. 14, 221–228 (2021). https://doi.org/10.1007/s12200-019-0921-6
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DOI: https://doi.org/10.1007/s12200-019-0921-6