Polarization-sensitive and active controllable electromagnetically induced transparency in U-shaped terahertz metamaterials

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.

Graphical abstract

Keywords

electromagnetically induced transparency (EIT) / metamaterial / polarization-sensitive / active optical devices / sensor

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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).

RIGHTS & PERMISSIONS

2019 Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature