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Giant enhancement of second harmonic generation via merging bound states in the continuum for vacuum ultraviolet radiation.

Authors :
Li, Jianmei
Chang, Wenyao
Guo, Zirui
Li, Pinxu
Fu, Ziyi
Luo, Cai
Hou, Yanxue
Guo, Yang
Gu, Changzhi
Source :
Applied Physics Letters. 3/25/2024, Vol. 124 Issue 13, p1-7. 7p.
Publication Year :
2024

Abstract

Vacuum ultraviolet (VUV) light plays a crucial role in various scientific and technological fields, such as nanolithography and biomedical treatments. However, the inherent nonlinear optical coefficient of nonlinear optical crystals is typically very low, and increasing the action length is often necessary to improve the nonlinear conversion efficiency. This makes it challenging for these materials to achieve high-density optoelectronic integration at the micro-/nano-scale. In this study, we propose a design for generating coherent VUV radiation close to 175 nm using second harmonic generation (SHG) with an absolute efficiency exceeding 1.2‰ mW−1. This is achieved by merging multiple bound state in the continuum modes in a free-standing photonic crystal slab. Even with fabrication imperfections at a level lower than 10% disorder, the SHG efficiency of the samples remains robust, maintaining an efficiency of at least 2‰. This research provides a beneficial platform for generating efficient VUV light in the nanoscale. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00036951
Volume :
124
Issue :
13
Database :
Academic Search Index
Journal :
Applied Physics Letters
Publication Type :
Academic Journal
Accession number :
176342036
Full Text :
https://doi.org/10.1063/5.0193124