Terahertz spatial filter based on enhanced optical transmission in the subwavelength aperture

Yuzhe Zhang; Tong Zhang; Shufeng Lin; Lu Rong; Jie Zhao; Dayong Wang

doi:10.1117/12.2666854

27 January 2023 Terahertz spatial filter based on enhanced optical transmission in the subwavelength aperture

Yuzhe Zhang, Tong Zhang, Shufeng Lin, Lu Rong, Jie Zhao, Dayong Wang

Proceedings Volume 12550, International Conference on Optical and Photonic Engineering (icOPEN 2022); 125502E (2023) https://doi.org/10.1117/12.2666854
Event: International Conference on Optical and Photonic Engineering (icOPEN 2022), 2022, ONLINE, China

Abstract

Beam quality is a core issue in the field of terahertz full-field imaging. In this paper, we present a terahertz spatial filter consisting of two mounted ellipsoidal silicon lenses, which have the same eccentricity but unequal size, and an opening aperture on a thin gold layer between the lenses. At the frequency of 2.52 THz, the beam transmissivity and Gaussicity of the filtering system is investigated by simulation. COMSOL Multiphysics is used to conduct two-dimensional simulation experiments, aiming to find the appropriate aperture size and gold layer thickness, depending on the wavelength of incident light wave and numerical aperture of the ellipsoidal silicon lens. The filtering system is capable of filtering the non-Gaussian beam to a nearly fundamental Gaussian beam and achieves a high transmissivity. In terahertz full-field imaging, the system can not only obtain an imaging beam with uniform intensity distribution, but also reduce the beam energy loss caused by multiple surfaces. Besides, the lens system is applicable for a wide terahertz frequency range if the wavelength dependent part is properly scaled.

Citation Download Citation

Yuzhe Zhang, Tong Zhang, Shufeng Lin, Lu Rong, Jie Zhao, and Dayong Wang "Terahertz spatial filter based on enhanced optical transmission in the subwavelength aperture", Proc. SPIE 12550, International Conference on Optical and Photonic Engineering (icOPEN 2022), 125502E (27 January 2023); https://doi.org/10.1117/12.2666854

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