High-Efficiency All-Dielectric Huygens Metasurfaces from the Ultraviolet to the Infrared

Abstract

Conventional optics depend on the gradual accumulation of spatially dependent phase shifts imparted on light propagating through a medium to modify the wavefront of an incident beam. A similar effect may be obtained by the imposition of abrupt, discrete phase changes on a propagating wavefront over a subwavelength scale using photonic metasurfaces. Highly efficient metasurfaces have applications ranging from conventional optics to high-efficiency solar energy conversion, optical communications, and more. We present here the design, computational modeling, and experimental demonstration of all-dielectric transmissive Huygens metasurfaces exhibiting anomalous refraction, defined as the controlled deflection of light at an interface as a function of subwavelength nanostructures. These metasurfaces are composed of dielectric, cylindrical elements, characterized by balanced electric and magnetic dipole resonances. For infrared wavelengths, optical efficiency of 91.3% is demonstrated computationally, and experi...