Tunable Polymer/Air Bragg Optical Microcavity Configurations for Controllable Light-Matter Interaction Scenarios

TL;DR

This paper presents a novel 3D nanowriting technique for creating tunable polymer/air microcavities with Bragg mirrors, enabling controllable light-matter interactions for advanced photonic applications.

Contribution

It introduces a new method for fabricating mechanically-tunable polymer microcavities with Bragg mirrors using 3D nanowriting, expanding capabilities for LMI studies.

Findings

Microcavities with polymer/air Bragg mirrors enable mode tuning.

Transfer-matrix calculations confirm tunability via compression.

The approach is suitable for on-chip photonic devices.

Abstract

Complex optical systems such as high-quality microcavities enabled by advanced lithography and processing techniques paved the way to various light-matter interactions (LMI) studies. Without lattice-matching constraints in epitaxy, coating techniques or shaky open cavity constructions, sub-micrometer-precise lithographic development of a polymer photoresist paves the way to polymer microcavity structures for various spectral regions based on the material's transparency and the geometrical sizes. We introduce a new approach based on 3D nanowriting in photoresist, which can be employed to achieve microscopic photonic Fabry-P\'erot cavity structures with mechanically-tunable resonator modes and polymer/air Bragg mirrors, directly on a chip or device substrate. We demonstrate by transfer-matrix calculations and computer-assisted modelling that open microcavities with up to two "air-Bragg" reflectors comprising alternating polymer/air mirror-pair layers enable compression-induced mode tuning that can benefit many LMI experiments, such as with 2D materials, nanoparticles and molecules.