Polarization-Dependent Second Harmonic Diffraction from Resonant GaAs Metasurfaces
[1];
[3];
[6];
[3];
- Friedrich Schiller University Jena (Germany)
- Friedrich Schiller University Jena (Germany); Lomonosov Moscow State University (Russia)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Lomonosov Moscow State University (Russia); Cornell Univ., Ithaca, NY (United States)
- JCMwave, Berlin (Germany); Zuse Institute Berlin (Germany)
- Lomonosov Moscow State University (Russia)
Resonant semiconductor metasurfaces are an emerging versatile platform for nonlinear photonics. Here, we investigate second-harmonic generation from metasurfaces consisting of two-dimensional square arrays of gallium arsenide nanocylinders as a function of the polarization of the fundamental wave. To this end, we perform nonlinear second harmonic microscopy, where the pump wavelength is tuned to the resonances of the metasurfaces. Furthermore, imaging the generated nonlinear signal in Fourier space allows us to analyze the spatial properties of the generated second harmonic. Our experiments reveal that the second harmonic is predominantly emitted into the first diffraction orders of the periodic arrangements, and that its intensity varies with the polarization angle of the fundamental wave. While this can be expected from the structure of the GaAs nonlinear tensor, the characteristics of this variation itself are found to depend on the pump wavelength. Interestingly, we show that the metasurface can reverse the polarization dependence of the second harmonic with respect to an unstructured GaAs wafer. These general observations are confirmed by numerical simulations using a simplified model for the metasurface. In conclusion, our results provide valuable input for the development of metasurface-based classical and quantum light sources based on parametric processes.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC04-94AL85000; NA0003525
- OSTI ID:
- 1485831
- Report Number(s):
- SAND-2018-13259J; 670252
- Journal Information:
- ACS Photonics, Vol. 5, Issue 5; ISSN 2330-4022
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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