Efficient second harmonic generation by harnessing bound states in the continuum in semi-nonlinear etchless lithium niobate waveguides

Xueshi Li; Jiantao Ma; Shunfa Liu; Peinian Huang; Bo Chen; Dunzhao Wei; Jin Liu

doi:10.1038/s41377-022-01017-x

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Efficient second harmonic generation by harnessing bound states in the continuum in semi-nonlinear etchless lithium niobate waveguides

Original Articles

- Efficient second harmonic generation by harnessing bound states in the continuum in semi-nonlinear etchless lithium niobate waveguides
- Efficient second harmonic generation by harnessing bound states in the continuum in semi-nonlinear etchless lithium niobate waveguides
- LSA 2022年11卷第11期页码：2774-2781
- Affiliations：
  
  State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, 510275 Guangzhou, China
- Author bio：
  
  Dunzhao Wei (weidzh@mail.sysu.edu.cn)
  Jin Liu (liujin23@mail.sysu.edu.cn)
- Funds：
- DOI：10.1038/s41377-022-01017-x
  中图分类号：
- 纸质出版日期：2022-11-30，
  
  网络出版日期：2022-11-01，
  
  收稿日期：2022-08-08，
  
  修回日期：2022-10-08，
  
  录用日期：2022-10-12
- Accepted：
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Efficient second harmonic generation by harnessing bound states in the continuum in semi-nonlinear etchless lithium niobate waveguides[J]. LSA, 2022,11(11):2774-2781.

Li, X. S. et al. Efficient second harmonic generation by harnessing bound states in the continuum in semi-nonlinear etchless lithium niobate waveguides. Light: Science & Applications, 11, 2774-2781 (2022).
Efficient second harmonic generation by harnessing bound states in the continuum in semi-nonlinear etchless lithium niobate waveguides[J]. LSA, 2022,11(11):2774-2781. DOI： 10.1038/s41377-022-01017-x.

Li, X. S. et al. Efficient second harmonic generation by harnessing bound states in the continuum in semi-nonlinear etchless lithium niobate waveguides. Light: Science & Applications, 11, 2774-2781 (2022). DOI： 10.1038/s41377-022-01017-x.

摘要

Abstract

Integrated photonics provides unprecedented opportunities to pursue advanced nonlinear light sources with low-power consumptions and small footprints in a scalable manner

such as microcombs

chip-scale optical parametric oscillators and integrated quantum light sources. Among a variety of nonlinear optical processes

high-efficiency second harmonic generation (SHG) on-chip is particularly appealing and yet challenging. In this work

we present efficient SHG in highly engineerable semi-nonlinear waveguides consisting of electron-beam resist waveguides and thin-film silicon nitride (SiN)/lithium niobate (LN). By carefully designing octave-separating bound states in the continuum (BICs) for the nonlinear interacting waves in such a hybrid structure

we have simultaneously optimized the losses for both fundamental frequency (FF) and second harmonic (SH) waves and achieved modal phasing matching and maximized the nonlinear modal overlap between the FF and SH waves

which results in an experimental conversion efficiency up to 4.05% W

−1

−2

. Our work provides a versatile and fabrication-friendly platform to explore on-chip nonlinear optical processes with high efficiency in the context of nanophotonics and quantum optics.

关键词

Keywords

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