All-dielectric band stop filter at terahertz frequencies

Shan Yin; Lin Chen

doi:10.1117/12.2292153

12 January 2018 All-dielectric band stop filter at terahertz frequencies

Shan Yin, Lin Chen

Proceedings Volume 10623, 2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications; 1062307 (2018) https://doi.org/10.1117/12.2292153
Event: International Conference on Optical Instruments and Technology 2017, 2017, Beijing, China

Abstract

We design all-dielectric band stop filters with silicon subwavelength rod and block arrays at terahertz frequencies. Supporting magnetic dipole resonances originated from the Mia resonance, the all-dielectric filters can modulate the working band by simply varying the structural geometry, while eliminating the ohmic loss induced by the traditional metallic metamaterials and uninvolved with the complicated mechanism. The nature of the resonance in the silicon arrays is clarified, which is attributed to the destructive interference between the directly transmitted waves and the waves emitted from the magnetic dipole resonances, and the resonance frequency is determined by the dielectric structure. By particularly designing the geometrical parameters, the profile of the transmission spectrum can be tailored, and the step-like band edge can be obtained. The all-dielectric filters can realize 93% modulation of the transmission within 0.04 THz, and maintain the bandwidth of 0.05 THz. This work provides a method to develop THz functional devices, such as filters, switches and sensors.

Citation Download Citation

Shan Yin and Lin Chen "All-dielectric band stop filter at terahertz frequencies", Proc. SPIE 10623, 2017 International Conference on Optical Instruments and Technology: IRMMW-THz Technologies and Applications, 1062307 (12 January 2018); https://doi.org/10.1117/12.2292153

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KEYWORDS

Silicon

Terahertz radiation

Diffraction

Modulation

Metamaterials

Optical filters

Dielectric filters

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