期刊
LIGHT-SCIENCE & APPLICATIONS
卷 7, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/lsa.2017.126
关键词
gallium selenide; photonic crystal cavity; second harmonic generation; two-dimensional materials
类别
资金
- NSFC [61522507, 11404264, 61377035, 11634010]
- Natural Science Basic Research Plan in Shaanxi Province of China [2016JQ6004]
- Fundamental Research Funds for the Central Universities [3102017jc01001]
We demonstrate the first achievement of continuous-wave (CW) pumped second harmonic generation (SHG) in few-and monolayer 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.
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