In contrast to strong plasmonic scattering from metal particles or structures in metal films, we show that patterns of arbitrary shape fabricated out of multilayer hyperbolic metamaterials become invisible within a chosen band of optical frequencies. This is due to anomalously weak scattering when the in-plane permittivity of the multilayer hyperbolic metamaterials is tuned to match with the surrounding medium. This new phenomenon is described theoretically and demonstrated experimentally by optical characteri- zation of various patterns in Au-Si multilayer hyperbolic metamaterials. This anomalously weak scattering is insensitive to pattern sizes, shapes, and incident angles, and has potential applications in scattering cross- section engineering, optical encryption, low-observable conductive probes, and optoelectric devices.
Shen, H., Lu, D., VanSaders, B., Kan, J. J., Xu, H., Fullerton, E. E., & Liu, Z. (2015). Anomalously weak scattering in metal-semiconductor multilayer hyperbolic metamaterials. Physical Review X, 5(2). https://doi.org/10.1103/PhysRevX.5.021021