Abstract：
:Recent advances in nonlinear optics have revolutionized integrated photonics, providing on-chip solutions to a wide range of new applications. Currently, state of the art integrated nonlinear photonic devices are mainly based on dielectric material platforms, such as Si3N4 and SiO2. While semiconductor materials feature much higher nonlinear coefficients and convenience in active integration, they have suffered from high waveguide losses that prevent the realization of efficient nonlinear processes on-chip. Here, we challenge this status quo and demonstrate a low loss AlGaAs-on-insulator platform with anomalous dispersion and quality (Q) factors beyond 1.5 × 106. Such a high quality factor, combined with high nonlinear coefficient and small mode volume, enabled us to demonstrate a Kerr frequency comb threshold of only ∼36 µW in a resonator with a 1 THz free spectral range, ∼100 times lower compared to that in previous semiconductor platforms. Moreover, combs with broad spans (>250 nm) have been generated with a pump power of ∼300 µW, which is lower than the threshold power of state-of the-art dielectric micro combs. A soliton-step transition has also been observed for the first time in an AlGaAs resonator.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Chang L,Xie W,Shu H,Yang QF,Shen B,Boes A,Peters JD,Jin W,Xiang C,Liu S,Moille G,Yu SP,Wang X,Srinivasan K,Papp SB,Vahala K,Bowers JEdoi
10.1038/s41467-020-15005-5subject
Has Abstractpub_date
2020-03-12 00:00:00pages
1331issue
1issn
2041-1723pii
10.1038/s41467-020-15005-5journal_volume
11pub_type
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