Experimental demonstration of broadband absorption enhancement in partially aperiodic silicon nanohole structures

TL;DR

This paper presents the design, fabrication, and experimental validation of silicon nanohole structures with partial aperiodicity, achieving significantly enhanced broadband optical absorption compared to periodic structures.

Contribution

It introduces a novel partially aperiodic nanohole design optimized via a random walk algorithm, demonstrating substantial absorption improvements.

Findings

Broadband absorption increased by 4.9 times over periodic arrays

Excellent agreement between experimental measurements and simulations

Optimization via a random walk algorithm effectively enhances absorption

Abstract

We report the design, fabrication, and optical absorption measurement of silicon membranes patterned with partially aperiodic nanohole structures. We demonstrate excellent agreement between measurement and simulations. We optimize a partially aperiodic structure using a random walk algorithm and demonstrate an experimental broadband absorption of 4.9 times that of a periodic array.