Nonlinear Mid-infrared Metasurface based on a Phase-Change Material
Abstract
The mid-wave infrared (MWIR) spectral region (3-5 {\mu}m) is important to a vast variety of applications in imaging, sensing, spectroscopy, surgery, and optical communications. Efficient third-harmonic generation (THG), converting light from the MWIR range into the near-infrared, a region with mature optical detection and manipulation technologies, offers the opportunity to mitigate a commonly recognized limitation of current MWIR systems. In this work, we present the possibility of boosting THG in the MWIR through a metasurface design. Specifically, we demonstrate a 30-fold enhancement in a highly nonlinear phase change material Ge2Sb2Se4Te1 (GSST), by patterning arrays of subwavelength cylinders supporting a magnetic dipolar resonance. The unprecedented broadband transparency, large refractive index, and remarkably high nonlinear response, together with unique phase-change properties, make GSST-based metasurfaces an appealing solution for reconfigurable and ultra-compact nonlinear devices operating in the MWIR.
Cite
@article{arxiv.2008.13332,
title = {Nonlinear Mid-infrared Metasurface based on a Phase-Change Material},
author = {Fuyong Yue and Riccardo Piccoli and Mikhail Y. Shalaginov and Tian Gu and Kathleen Richardson and Roberto Morandotti and Juejun Hu and Luca Razzari},
journal= {arXiv preprint arXiv:2008.13332},
year = {2020}
}
Comments
15 pages, 3 figures