Abstract
A hybrid silicon-core, silica-clad microspherical resonator has been fabricated from the semiconductor core fiber platform. Linear and nonlinear characterization of the resonator properties have shown it to exhibit advantageous properties associated with both materials, with the low loss cladding supporting high quality (Q) factor whispering gallery modes which can be tuned through the nonlinear response of the crystalline core. By exploiting the large wavelength shift associated with the Kerr nonlinearity, we have demonstrated all-optical modulation of a weak probe on the timescale of the femtosecond pump pulse. This novel geometry offers a route to ultra-low loss, high-Q silica-based resonators with enhanced functionality.
Highlights
Efficient light-matter interactions in whispering gallery mode (WGM) microresonators with ultra-high quality (Q) factors and small mode volumes are of great interest for the development of compact and low power photonic devices
Linear and nonlinear characterization of the resonator properties have shown it to exhibit advantageous properties associated with both materials, with the low loss cladding supporting high quality (Q) factor whispering gallery modes which can be tuned through the nonlinear response of the crystalline core
By exploiting the large wavelength shift associated with the Kerr nonlinearity, we have demonstrated all-optical modulation of a weak probe on the timescale of the femtosecond pump pulse
Summary
Efficient light-matter interactions in whispering gallery mode (WGM) microresonators with ultra-high quality (Q) factors and small mode volumes are of great interest for the development of compact and low power photonic devices. Resonators fabricated from micrometer sized glass fibers can be produced via a simple heating process that makes use of surface tension reshaping to form resonators with surface roughness values σ
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