Coupled fiber taper extraction of 1.53 um photoluminescence from erbium doped silicon nitride photonic crystal cavities

TL;DR

This paper demonstrates enhanced photoluminescence collection from erbium-doped silicon nitride photonic crystal cavities using fiber tapers, achieving 2.5 times higher efficiency and tunable coupling, advancing on-chip optical amplifier development.

Contribution

It introduces a fiber taper collection method for erbium-doped silicon nitride cavities, achieving significant efficiency improvements and tunable coupling for integrated photonic applications.

Findings

Fiber taper collection efficiency reaches 53%.

Photoluminescence collection is enhanced 2.5 times over free space.

Tunable coupling achieved by adjusting fiber taper offset.

Abstract

Optical fiber tapers are used to collect photoluminescence emission at ~1.5 um from photonic crystal cavities fabricated in erbium doped silicon nitride on silicon. Photoluminescence collection via fiber taper is enhanced 2.5 times relative to free space, with a total taper collection efficiency of 53%. By varying the fiber taper offset from the cavity, a broad tuning range of coupling strength is obtained. This material system combined with fiber taper collection is promising for building on-chip optical amplifiers.