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Asia Communications and Photonics Conference

Efficiency Tunable All-Optical Controlled Coupled-Mode Induced Transparency in a Microsphere Resonator

Weichen Yuan, Zhenmin Chen, H. Y. Fu

Published Nov 4, 2023• 0 citations
Publisher

Abstract

In this work, based on a dual-laser pumping scheme, an all-optical controlled coupled-mode induced transparency (CMIT) in a silica microsphere resonator (MSR) has been demonstrated, experimentally and theoretically. This proposed scheme is stable, simple and power efficient. More interestingly, by changing the power of one of the lasers, which functions as the heat source, the wavelength shifting rate of the CMIT can be changed. Our experimental results reveals that when the power of the laser acting as the heat source increases from 1 mW to 5 mW, the wavelength shifting rate experiences a nearly two times increase.

DOI
10.1109/acp/poem59049.2023.10368828

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In this work, based on a dual-laser pumping scheme, an all-optical controlled coupled-mode induced transparency (CMIT) in a silica microsphere resonator (MSR) has been demonstrated, experimentally and theoretically. This proposed scheme is stable, simple and power efficient. More interestingly, by changing the power of one of the lasers, which functions as the heat source, the wavelength shifting rate of the CMIT can be changed. Our experimental results reveals that when the power of the laser acting as the heat source increases from 1 mW to 5 mW, the wavelength shifting rate experiences a nearly two times increase.
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We theoretically and experimentally study the resonant transmission spectrum of light in a fibre taper coupled with a single silica microsphere cavity system, where two whispering-gallery modes (WGMs) are simultaneously excited. By changing the taper position (correspondingly, tuning the resonant frequencies of the two WGMs and modulating their coupling conditions with the fibre taper), a sharp electromagnetically-induced- transparency-like window can be observed in the transmission spectrum. This line shape origins from the taper-mediated interference between two co-existing WGMs in a single microsphere. This measurement result agrees well with the theoretical analysis.
We present experimental results on an all-optical, thermally-assisted technique for broad range tuning of microsphere cavity resonance modes to arbitrary probe wavelengths. An erbium:ytterbium co-doped phosphate glass (Schott IOG-2) microsphere is pumped at 978 nm via the supporting stem and the heat generated by absorption of the pump light expands the cavity and changes the refractive index. This is a robust tuning method that decouples the pump from the probe and allows fine tuning of the microsphere's whispering gallery modes. Pump/probe experiments were performed to demonstrate thermo-optical tuning to specific probe wavelengths, including the5S1/2F= 3 to5P3/2F'= 4 laser cooling transition of rubidium-85. This is of particular interest for cavity quantum electrodynamics (QED)-type experiments, while the broad tuning range achievable is useful for integrated photonic devices, including sensors and modulators.