Active terahertz frequency conversion on silicon-based time-varying metasurface

Author:

Jiang Yushun1ORCID,Duan Siyu1,Wu Jingbo12ORCID,Qiu Hongsong1,Zhang Caihong12ORCID,Fan Kebin12ORCID,Wang Huabing12ORCID,Jin Biaobing12ORCID,Chen Jian12ORCID,Wu Peiheng12ORCID

Affiliation:

1. Research Institute of Superconductor Electronics (RISE) and Key Laboratory of Optoelectronic Devices and Systems with Extreme Performances of MOE, School of Electronic Science and Engineering, Nanjing University 1 , Nanjing 210023, China

2. Purple Mountain Laboratories 2 , Nanjing 211111, China

Abstract

Terahertz (THz) metasurfaces have emerged as the preferred material for active devices, with numerous potential applications. However, due to a lack of materials with an ultrafast response, functional devices with fascinating time-varying phenomena remain to be explored. In this study, we experimentally investigated a time-varying THz metasurface with silicon–gold hybrid structures. The results show that the transmission spectra undergo a remarkable transformation when an optical pump is used. A transient time boundary is introduced to study the time-varying response using the sudden change in silicon conductivity in the presence of an optical pump. We observed the generation of new spectral components, and the magnitude of the converted wave is linear with the incident power. The proposed silicon-based THz time-varying metasurface paves the way for developing THz sources and nonlinear optical devices.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China-China Academy of General Technology Joint Fund for Basic Research

Central University Basic Research Fund of China

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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