Tailoring Properties of Magneto-Optical Photonic Crystals

TL;DR

This paper models and optimizes magneto-optical photonic crystals doped with Erbium to achieve specific Faraday rotation and transmittance properties at 1531nm, enhancing sensor and laser applications.

Contribution

It introduces a detailed modeling and optimization approach for Erbium-doped MOPCs, reducing dopant concentration and thickness while maintaining desired MO properties.

Findings

Optimal Erbium concentration identified for target properties.

Reduced multilayer thickness without compromising performance.

Enhanced understanding of microcavity positioning effects.

Abstract

Magneto-Optic Photonic Crystals (MOPC) used in low dimension lasers whereby acting as Faraday rotators capable of 45o rotation where insertion loos is compensated by photoluminescence effect are of significant interest. In low dimension sensors MOPCs act as optical filters to selectively detect only lights at certain wavelengths. Combined with the photoluminescence effect, sensors may be designed capable of detecting signals with extremely low intensity, thus high quantum efficiency. In this work, MOPC with various Erbium dopant concentrations, acting as photoluminescence center, were modelled under high pumping power regime associated to 0.985 inversion population to identify the minimum Erbium concentration and number of layers for the target 45 degrees FR, 0.9 transmittance and minimal ellipticity at the resonance wavelength 1531nm. Further optimization of Magneto-optical (MO) properties versus the microcavity position within the MOPC was investigated. An optimum multilayered configuration and composition was identified with a reduction in both erbium concentration and total thickness compared to what was reported previously without compromising the target MO properties.