Journal
LASER & PHOTONICS REVIEWS
Volume 16, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202100071
Keywords
frequency combs; GaN; Kerr solitons; nanophotonics; nonlinear optics
Categories
Funding
- National Key Research and Development Program of China [2018YFB2201700]
- National Natural Science Foundation of China [61975093, 61927811, 61822404, 61974080, 61904093, 61875104]
- China Postdoctoral Science Foundation [2018M640129, 2019T120090]
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This paper reports GaNOI microresonators with intrinsic quality factors over 2.5 million, corresponding to an optical loss of 0.17 dB cm(-1). It demonstrates a parametric oscillation threshold power as low as 6.2 mW and estimates the experimentally extracted nonlinear index of GaN at telecom wavelengths to be n(2) = 1.4 x 10(-18) m(2) W-1, which is several times larger than that of commonly used platforms such as Si3N4, LiNbO3, and AlN. The large intrinsic nonlinear refractive index, together with its broadband transparency window and high refractive index contrast, make GaNOI a promising platform for chip-scale nonlinear applications.
Gallium nitride (GaN) as a wide bandgap material is widely used in solid-state lighting. Thanks to its high nonlinearity and high refractive index contrast, GaN-on-insulator (GaNOI) is also a promising platform for nonlinear optical applications. Despite its intriguing optical proprieties, nonlinear applications of GaN are rarely studied owing to the relatively high optical loss of GaN waveguides (typically approximate to 2 dB cm(-1)). In this paper, GaNOI microresonators with intrinsic quality factor over 2.5 million are reported, corresponding to an optical loss of 0.17 dB cm(-1). Parametric oscillation threshold power as low as 6.2 mW is demonstrated, and the experimentally extracted nonlinear index of GaN at telecom wavelengths is estimated to be n(2) = 1.4 x 10(-18) m(2) W-1, which is several times larger than that of commonly used platform such as Si3N4, LiNbO3, and AlN. Single soliton generation in GaN is implemented by an auxiliary laser pumping scheme, so as to mitigate the high thermorefractive effect in GaN. The large intrinsic nonlinear refractive index, together with its broadband transparency window and high refractive index contrast, make GaNOI a promising platform for chip-scale nonlinear applications.
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