Microwatts continuous-wave pumped second harmonic generation in few- and mono-layer GaSe

Xue-Tao Gan; Chen-Yang Zhao; Si-Qi Hu; Tao Wang; Yu Song; Jie Li; Qing-Hua Zhao; Wan-Qi Jie; Jian-Lin Zhao

doi:10.1038/lsa.2017.126

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Microwatts continuous-wave pumped second harmonic generation in few- and mono-layer GaSe

Original Articles

- Microwatts continuous-wave pumped second harmonic generation in few- and mono-layer GaSe
- Light: Science & Applications Vol. 7, Issue 1, (2018)
- Affiliations：
  
  1.MOE Key Laboratory of Space Applied Physics and Chemistry and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710072, China
  2.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
- Author bio：
  
  XT Gan, Email: xuetaogan@nwpu.edu.cn
  JL Zhao, Email: jlzhao@nwpu.edu.cn
- Funds：
- DOI：10.1038/lsa.2017.126
  CLC：
- Published：2018，
  
  Published Online：12 January 2018，
  
  Received：24 March 2017，
  
  Revised：23 August 2017，
  
  Accepted：25 August 2017
- Accepted：
Scan QR Code
Gan, X. T. et al. Microwatts continuous-wave pumped second harmonic generation in few- and mono-layer GaSe. Light: Science & Applications, 1, 17126 (2018).
DOI：

Gan, X. T. et al. Microwatts continuous-wave pumped second harmonic generation in few- and mono-layer GaSe. Light: Science & Applications, 1, 17126 (2018). DOI： 10.1038/lsa.2017.126.

摘要

Abstract

We demonstrate the first achievement of continuous-wave (CW) pumped second harmonic generation (SHG) in few- and mono-layer gallium selenide (GaSe) flakes

which are coated on silicon photonic crystal (PC) cavities. Because of ultrahigh second order nonlinearity of the two-dimensional (2D) GaSe and localized resonant mode in the PC cavity

SHG's pump power is greatly reduced to microwatts. In a nine-layer GaSe coated PC cavity

while the optical power inside the GaSe flake is only 1.5% of that in the silicon PC slab

the SHG in GaSe is more than 650 times stronger than the third harmonic generation in silicon slab

indicating 2D GaSe's great potentials to strengthen nonlinear processes in silicon photonics. Our study opens up a new view to expand 2D materials' optoelectronic applications in nonlinear regime and chip-integrated active devices.

关键词

Keywords

gallium selenidephotonic crystal cavitysecond harmonic generationtwo-dimensional materials

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