Wavelength de-multiplexing properties of a single aperture flanked by periodic arrays of indentations

TL;DR

This paper demonstrates how asymmetric periodic indentations around a single subwavelength aperture can be used to selectively transmit and direct two specific wavelengths, enabling the design of micron-sized wavelength de-multiplexers.

Contribution

It introduces a novel structured metal design that achieves wavelength de-multiplexing and directional beam control using asymmetric corrugations.

Findings

Selective transmission of two wavelengths achieved.

Wavelengths can be directed as narrow beams at specific angles.

Design enables micron-scale wavelength de-multiplexers.

Abstract

In this paper we explore the transmission properties of single subwavelength apertures perforated in thin metallic films flanked by asymmetric configurations of periodic arrays of indentations. It is shown how the corrugation in the input side can be used to transmit selectively only two different wavelengths. Also, by tuning the geometrical parameters defining the corrugation of the output side, these two chosen wavelengths can emerge from the structure as two very narrow beams propagating at well-defined directions. This new ability of structured metals can be used as a base to build micron-sized wavelength de-multiplexers.