Study on the optically tunable negative refractive terahertz metamaterials

Renshuai Huang; Qinglong Meng; Jing Shang; Yan Zhang

doi:10.1117/12.2653368

15 December 2022 Study on the optically tunable negative refractive terahertz metamaterials

Renshuai Huang, Qinglong Meng, Jing Shang, Yan Zhang

Proceedings Volume 12478, Thirteenth International Conference on Information Optics and Photonics (CIOP 2022); 124781K (2022) https://doi.org/10.1117/12.2653368
Event: Thirteenth International Conference on Information Optics and Photonics (CIOP 2022), 2022, Xi'an, China

Abstract

Optically tunable negative refractive metamaterials composed of electric response split-ring resonator (eSRR) and magnetic response split-ring resonator (mSRR) are theoretically investigated in terahertz (THz) region. A negative refractive band is achieved when both the eSRR and mSRR are fabricated on one substrate. Meanwhile, the optically tunable response is realized by filling the photo conductive semiconductor GaAs in the capacitive regions of eSRR. The electric response frequency varies with the pump laser fluence, therefore, the electric response frequency is controlled to overlap with the magnetic response frequency, and the negative refractive of the metamaterials can be controlled flexibly. The extracted constitutive parameters illuminate that a bandwidth 60GHz of negative refractive is realized when eSRR and mSRR combine together (with no GaAs), while a negative band width 30GHz is realized at the same structure parameters (with GaAs) when the pump laser fluence increases to 0.4mJ/cm². Furthermore, the transmission spectra changes from dual band to single band with the variation of pump laser fluence.

Citation Download Citation

Renshuai Huang, Qinglong Meng, Jing Shang, and Yan Zhang "Study on the optically tunable negative refractive terahertz metamaterials", Proc. SPIE 12478, Thirteenth International Conference on Information Optics and Photonics (CIOP 2022), 124781K (15 December 2022); https://doi.org/10.1117/12.2653368

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KEYWORDS

Laser frequency

Frequency response

Permeability

Tunable metamaterials

Magnetism

Optical metamaterials

Gallium arsenide

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