We demonstrate second-harmonic generation in photonic crystal cavities in (001)- and (111)B-oriented GaAs. The fundamental resonance is at 1800 nm, leading to generated second harmonic below the GaAs band gap. Below-band-gap operation minimizes absorption of the second-harmonic and two-photon absorption of the pump. Photonic crystal cavities were fabricated in both orientations at various in-plane rotations of the GaAs substrate. The rotation dependence and far-field patterns of the second harmonic match simulation. We observe similar maximum efficiencies of 1.2%/W in (001)- and (111)B-oriented GaAs.
- nonlinear optics
- photonic crystals
- semiconductor microcavities
Buckley, S., Radulaski, M., Petykiewicz, J., Lagoudakis, K. G., Kang, J-H., Brongersma, M., Biermann, K., & Vučković, J. (2014). Second-harmonic generation in GaAs photonic crystal cavities in (111)B and (001) crystal orientations. ACS Photonics, 1(6), 516-523. https://doi.org/10.1021/ph500054u