Second-harmonic generation using 4-quasi-phasematching in a GaAs whispering-gallery-mode microcavity.

Second-harmonic generation using 4-quasi-phasematching in a GaAs whispering-gallery-mode microcavity.
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DOI:
10.1038/ncomms4109
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发表时间:
2014
影响因子:
16.6
通讯作者:
Solomon, Glenn S.
Solomon, Glenn S.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Kuo, Paulina S.;Bravo-Abad, Jorge;Solomon, Glenn S.

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The crystal symmetry in materials such as GaAs can enable quasi-phasematching for efficient optical frequency conversion without poling, twinning or other engineered domain inversions. symmetry means that a 90° rotation is equivalent to a crystallographic inversion. Therefore, when light circulates about the axis, as in GaAs whispering-gallery-mode microdisks, it encounters effective domain inversions that can produce quasi-phasematching. Microdisk resonators also offer resonant field enhancement, resulting in highly efficient frequency conversion in micrometre-scale volumes. These devices can be integrated in photonic circuits as compact frequency convertors, sources of radiation or entangled photons. Here we present the first experimental observation of second-harmonic generation in a whispering-gallery-mode microcavity utilizing -quasi-phasematching. We use a tapered fibre to couple into the 5-μm diameter microdisk resonator, resulting in a normalized conversion efficiency η≈5 × 10−5 mW−1. Simulations indicate that when accounting for fibre-cavity scattering, the normalized conversion efficiency is η≈3 × 10−3 mW−1. Second-harmonic generation is used in photonics applications to convert the frequency of light. Here, Kuo et al. demonstrate second-harmonic generation of light from a gallium arsenide microdisk resonator sufficiently compact to be suitable for on-chip optical circuits.
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