Efficient second- and higher-order harmonic generation from LiNbO3 metasurfaces

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)12926-12932
Journal / PublicationNanoscale
Volume15
Issue number31
Online published10 Jul 2023
Publication statusPublished - 21 Aug 2023

Abstract

Lithium niobate (LiNbO3) is a material that has drawn great interest in nonlinear optics because of its large nonlinear susceptibility and wide transparency window. However, for complex nonlinear processes such as high-harmonic generation (HHG), which involves frequency conversion over a wide frequency range, it can be extremely challenging for a bulk LiNbO3 crystal to fulfill the phase-matching conditions. LiNbO3 metasurfaces with resonantly enhanced nonlinear light-matter interaction at the nanoscale may circumvent such an issue. Here, we experimentally demonstrate efficient second-harmonic generation (SHG) and HHG from a LiNbO3 metasurface enhanced by guided-mode resonance. We observe a high normalized SHG efficiency of 5.1 × 10−5 cm2 GW−1. Moreover, with the alleviated above-gap absorption of the material, we demonstrate HHG up to the 7th order with the shortest generated wavelength of 226 nm. This work may provide a pathway towards compact coherent white-light sources with frequency spanning into the deep ultraviolet region for applications in spectroscopy and imaging. © 2023 The Royal Society of Chemistry

Citation Format(s)

Efficient second- and higher-order harmonic generation from LiNbO3 metasurfaces. / Zhao, Yun; Chen, Zhaoxi; Wang, Cheng et al.
In: Nanoscale, Vol. 15, No. 31, 21.08.2023, p. 12926-12932.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review