Optical Response of Nanohole Arrays Filled with Chalcogenide Low-Epsilon Media

摘要

When an array of subwavelength apertures in a metal film is filled with a chalcogenidesemiconductor acting as a low-epsilon medium at optical frequencies,an increase in transmission is observed over a broad range of plasmonicfrequencies, and found to be enabled by “laminar” flow of energy through thechalcogenide inclusions. As losses decrease in such a low-epsilon medium,with causality-bound dispersion of complex relative permittivity, a peak intransmission emerges at a wavelength tending toward that of unitary refractiveindex, while counterintuitively the absorption of the composite structureincreases.