Angular dependent terahertz emission from the interplay between nanocrystal diamond film and plasmonic metasurface

Shuangquan Fang; Wenpeng Guo; Yuanyuan Huang; Mingjian Shi; Xuezeng Tian; Baogang Quan; Xinlong Xu; Jian Yi; Nan Jiang; Changzhi Gu

doi:10.1016/j.isci.2024.108939

Angular dependent terahertz emission from the interplay between nanocrystal diamond film and plasmonic metasurface

iScience. 2024 Jan 18;27(2):108939. doi: 10.1016/j.isci.2024.108939. eCollection 2024 Feb 16.

Authors

Shuangquan Fang¹, Wenpeng Guo^{1

2}, Yuanyuan Huang³, Mingjian Shi³, Xuezeng Tian², Baogang Quan^{2

4

5}, Xinlong Xu³, Jian Yi⁶, Nan Jiang⁶, Changzhi Gu²

Affiliations

¹ College of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China.
² Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
³ Shaanxi Joint Lab of Graphene, State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, Northwest University, Xi'an 710069, China.
⁴ Songshan Lake Material Laboratory, Guangdong 523808, China.
⁵ University of Chinese Academy of Sciences, Beijing 100049, China.
⁶ Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.

Abstract

Composite structures integrated with metasurfaces and nonlinear films have emerged as alternative candidates to enhance nonlinear response. The cooperative interaction between the two components is complicated. Herein, a split-ring resonator (SRR)-type metasurface was fabricated on a free-standing nanocrystal diamond (NCD) film utilizing electron beam lithography, electron beam evaporation, and a lift-off process. The terahertz (THz) radiation from the SRR-NCD under normal incidence originates from the high-order magnetic resonance of SRR because the NCD film cannot produce detectable THz radiation at this incident angle. As increasing the incident angle, the contribution of the THz radiation from the NCD film gradually increases until reaching 40° incident angle limitation. The results indicate that this angular-dependent THz radiation is induced by the interplay between the NCD film and SRR. This study offers a new approach to investigate nonlinear processes in composite structures.

Keywords: Applied sciences; devices; materials application; photonics.