Focused field enhancement of terahertz metalens

Yuanda Liang; Yangyang Tian; Peng Zhong; Ling Guo; Wei Huang; Shan Yin

doi:10.1117/12.2590722

28 February 2021 Focused field enhancement of terahertz metalens

Yuanda Liang, Yangyang Tian, Peng Zhong, Ling Guo, Wei Huang, Shan Yin

Proceedings Volume 11781, 4th Optics Young Scientist Summit (OYSS 2020); 117811T (2021) https://doi.org/10.1117/12.2590722
Event: Optics Frontier: Optics Young Scientist Summit, 2020, Ningbo, China

Abstract

We propose a terahertz metalens based on Huygens’ metasurface which can realize the focused field enhancement compared with the single-layered metasurface. The metalens consists of two-layered well-arranged metallic C-shaped split-ring resonators array separated with the dielectric layer. After investigating the relationship between the transmission characteristics and the geometrical parameters of the metasurface, we demonstrate that the Huygens’ metasurface can efficiently enhance the transmission amplitude while inducing the phase gradient within the supercell. Due to higher transmission amplitude of the Huygens’ metasurface, the electric field of the focus is enhanced 117% at 0.8 THz. Our results may offer a new avenue to design efficient metalens, which is promising in developing metasurface-based integrated devices for the terahertz imaging.

Citation Download Citation

Yuanda Liang, Yangyang Tian, Peng Zhong, Ling Guo, Wei Huang, and Shan Yin "Focused field enhancement of terahertz metalens", Proc. SPIE 11781, 4th Optics Young Scientist Summit (OYSS 2020), 117811T (28 February 2021); https://doi.org/10.1117/12.2590722

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KEYWORDS

Terahertz radiation

Silicon

Dielectrics

Lens design

Split ring resonators

Electromagnetic radiation

Wavefronts

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