Optical metamaterials are materials that possess optical properties dissimilar to those of any naturally occurring material. Earlier, we fabricated a nonlinear metasurfaces consisting of gold nanoantennas sitting on a substrate of indium tin oxide (ITO), and we showed that such a material displays a nonlinear optical response many orders of magnitude larger than those of naturally occurring materials. We have also designed a metasurface consisting of mutually interacting nanoantennas that produce a sequence of high-Q resonances. We have shown numerically that such a structure can generate a strong second-harmonic output field.
- Large optical nonlinearity of nanoantennas coupled to an epsilon-near-zero material, M. Zahirul Alam, S. A. Schulz, J. Upham, I. De Leon and R. W. Boyd, Nature Photonics 12, 79–83 (2018).
- Efficient nonlinear metasurfaces by using multiresonant high-Q plasmonic arrays, M. J. Huttunen, O. Reshef, T. Stolt, K. Dolgaleva, R. W. Boyd, and M. Kauranen, Journal of the Optical Society of America B 36, E30-E35 (2019).