Single-periodic-film optical bandpass filter

TL;DR

This paper introduces a single-layer resonant periodic surface that functions as an ultra-narrow, high-efficiency optical bandpass filter, offering a simpler, more stable alternative to traditional multi-layer filters with comparable performance.

Contribution

The work presents the design and experimental realization of a single-layer resonant waveguide grating filter with performance similar to multi-layer filters, simplifying fabrication and enhancing stability.

Findings

Achieved ultra-narrow, high-efficiency bandpass filtering

Demonstrated performance comparable to 30-layer traditional filters

Validated design with rigorous Maxwell equation solutions

Abstract

Resonant periodic surfaces and films enable new functionalities with wide applicability in practical optical systems. Their material sparsity, ease of fabrication, and minimal interface count provide environmental and thermal stability and robustness in applications. Here we report an experimental bandpass filter fashioned in a single patterned layer on a substrate. Its performance corresponds to bandpass filters requiring perhaps 30 traditional thin-film layers as shown by an example. We demonstrate an ultra-narrow, high-efficiency bandpass filter with extremely wide, flat, and low sidebands. This class of devices is designed with rigorous solutions of the Maxwell equations while engaging the physical principles of resonant waveguide gratings. The proposed technology is integration-friendly and opens doors for further development in various disciplines and spectral regions where thin-film solutions are traditionally applied.