Abstract
Resonant light absorption in metallic nanostructures results from highly localized electric fields that are crucial for many processes such as Raman scattering, photoluminescence, hot-carrier creation, and photovoltaics. In recent years, there have been a substantial amount of studies related to the design and realization of resonant optical absorbers from microwave to optical frequencies. However, there has been little thought that went into investigation of direction-dependent absorption and reflection characteristics of optical materials. In this study, we introduce and realize an absorber that is capable of absorbing light asymmetrically depending on the illumination direction. By designing an asymmetrical dielectric permittivity profile along the propagation direction, we have been able to control the optical resonance strength of the absorber, resulting in asymmetric light absorption and reflection at resonance wavelengths. The proposed structure consists of a square hole lattice etched into a free-...
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