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Active control of terahertz wave assisted by dielectric loaded plasmonic waveguide

Liu Huaiqing, Yang Mengya, He Xue, Jiang Youchao, Zhou Xiancun, Fu Maosheng

Optica Applicata

2022

Vol. 52, nr 1

89--99

We propose and numerically investigate a directional coupler which consists of two dielectric loaded InSb based terahertz (THz) plasmonic waveguides. Owing to the permittivitly tunable property of InSb, the coupling strength between the two dielectric loaded plasmonic waveguides is affected by temperature, so the maximum power coupled from the input waveguide to the cross-waveguide and the correspondingly coupling length could be effectively tailored by altering temperature. Under different temperatures, this directional coupler could act as a thermally controlled terahertz wave switch or a 3-dB terahertz splitter around the frequency of 1.17 THz. This ultracompact and thermally controlled plasmonic directional coupler may find potential important applications in the highly integrated photonic circuits for terahertz system and technologies.

High sensitivity microsensor assisted by Fano resonance in InSb based terahertz plasmonic waveguide

Liu Huaiqing, Zhong Shuomin, Xu Gaoming

Optica Applicata

2019

Vol. 49, nr 4

585--596

We propose a compact terahertz plasmonic structure comprising an InSb-dielectric-InSb waveguideside-coupled with two stub resonators. Due to the coherent interference of the splitting discrete andquasi-continuum modes, the reflection spectrum possesses a sharp asymmetric Fano resonance dip, which stems from the phase difference between the two stub resonators. Owing to the permittivity temperature dependent property of InSb, the Fano resonance dip can be actively controlled by tuning temperature. The physical features contribute to a highly efficient plasmonic sensor for both refractive index and temperature sensing. The microsensor yields a sensitivity of ̴2.9 THz/RIUand 1.8 × 10–3 THz/°C. This multiparameter high sensitivity microsensor may find important applications in medical sensing, biosensing and on-chip sensing working in terahertz region.