Nonlinearities in GaAs cavities with high CW input powers enabled by photo oxidation quenching through ALD encapsulation
We demonstrate that conformal encapsulation using atomic layer deposition of GaAs nano cavity resonator made of photonic crystal cavity prevents photo induced oxidation. This improvement allows injecting a large quantity of energy in the resonator without any degradation of the material, thus enabling spectral stability of the resonance. We prove second harmonic and third harmonic generation over more than one decade of pump power variation, thanks to this encapsulation, with a total efficiency (eSHG 8.3 x 10 5 W 1 and eTHG 1.2 x 10 3 W 2) and a large net output energy for both operations (P SHG 0.2 nW and P THG 8 pW) (c) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement OCIS codes: (230.5298) Photonic crystals; (130.5990) Semiconductors; (190.0190) Nonlinear optics References and links 1. S. B. Papp, K. Beha, P. Del'Haye, F. Quinlan, H. Lee, K. J. Vahala, and S. A. 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