Rotated fourfold U-shape metasurface for polarization-insensitive strong enhancement of mid-infrared photodetection

• Main Authors: Tong, Jinchao, Suo, Fei, Tobing, Landobasa Yosef Mario, Xu, Zhengji, Xiong, Yao, Zhang, Dao Hua
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2022
• Subjects: Engineering::Electrical and electronic engineering; Split-Ring Resonators; Magnetic Response
• Online Access: https://hdl.handle.net/10356/161891
• Institution: Nanyang Technological University

Metasurface with thin planar resonant elements offers great capability in manipulating electromagnetic waves and their interaction with semiconductors. Split-ring resonator (SRR), as the basic building block, has been extensively investigated for myriad applications owing to its multiple electric and magnetic resonant modes. In this work, we report a rotated fourfold U-shape SRR metasurface for polarization-insensitive strong enhancement of mid-infrared photodetection. The integrated photodetector consists of a rotated fourfold SRR array and an InAsSb based heterojunction photodiode. A photosensitivity enhancement factor as high as 11 has been achieved by adoption of superimposed high order magnetic and electric resonant modes in the SRR metasurface. This work provides a promising pathway for exploring high performance polarization-insensitive photodetection in different electromagnetic wave ranges.