Design and implementation of a tunable composite photonic crystal cavity on an optical nanofiber

TL;DR

This paper presents a novel tunable composite photonic crystal cavity on an optical nanofiber, combining design, simulation, and experimental validation to enable precise control of cavity resonance for quantum applications.

Contribution

It introduces a new composite photonic crystal cavity design on an optical nanofiber with tunable resonance, validated through simulations and experiments.

Findings

Achieved b110 nm tunability of the cavity resonance wavelength.

Demonstrated low scattering loss in the designed cavity.

Experimental results closely match numerical simulations.

Abstract

We report a novel approach to the design and implementation of a tunable cavity on an optical nanofiber (ONF). The key point is to create a composite photonic crystal cavity (CPCC), by combining an ONF and a chirped period defect mode grating. Using numerical simulations we design the CPCC with low scattering loss while tuning the cavity resonance wavelength of \pm10 nm around the designed wavelength. We experimentally demonstrate the tunability of the CPCC, showing good agreement with the simulation results. Our results lay the foundation for a versatile platform for ONF cavity-quantum-electrodynamics with narrow bandwidth quantum emitters.