Francis Vanier

Raman lasing in As 2 S 3 high-Q whispering gallery mode resonators

We report the first observation of a nonlinear process in a chalcogenide microresonator. Raman scattering and stimulated Raman scattering leading to laser oscillation is observed in microspheres made of As₂S₃. The coupled pump power threshold is as low as 13 μW using a pump wavelength of 1550 nm. The quality factor of the chalcogenide microresonator is also the highest ever reported with Q>7×10(7).

Cascaded Raman lasing in packaged high quality As 2 S 3 microspheres

We report the observation of cascaded Raman lasing in high-Q As₂S₃microspheres. Cascaded stimulated Raman scattering emission is obtained up to the 5th order for a pump wavelength of 1557 nm and up to the 3rd order for a pump wavelength of 1880 nm. High-Q As₂S₃microspheres are used in a self-frequency locking laser setup without an external laser source. Threshold curves measurements are presented and follow the expected coupled mode theory behavior with a sub-mW threshold pump power.

Intrinsic quality factor determination in whispering gallery mode microcavities using a single Stokes parameters measurement

Determination of the intrinsic quality factor of a loaded whispering gallery mode microcavity can be important for many applications where the coupling conditions cannot be tuned. We propose a single-scan technique based on a Stokes parameters analysis to extract the intrinsic quality factor and therefore determine the coupling regime. We propose a simple model for this analysis and present experimental measurements, which are in very good agreement with the model.

As 2 S 3 microspheres with near absorption-limited quality factor

We present As2S3 microsphere optical resonators made out of high purity fiber. The quality factor is the highest reported to date for a nonlinear glass, nearly corresponding to the absorption attenuation value in the fiber.

Silica microdisk Coupled Resonator Optical Waveguide

This paper presents the first reported experimental results of optical transmission through microdisk Coupled Resonator Optical Waveguide structures made of silica. Transmission through a seven cavity waveguide is presented for an optical delay of 109ps.

Raman scattering emission in high Q factor As 2 S 3 microspheres

We present measurements of Raman scattering emission in high Q factor As₂S₃ microspheres. Emission is observed for input powers down to 120 μW and for resonances with Q factor below 10⁷.

Stokes Parameters Measurements for Whispering Gallery Modes Microcavities Characterization

When a Whispering Gallery Modes (WGM) optical cavity is coupled to an external waveguide, the total quality factor (Q T ) of a resonance characterizes the combined losses caused by the intrinsic losses, scattering and absorption, via the intrinsic Qfactor (Q 0 ) and the coupling losses due the waveguide via the coupling Q-factor (Q c ). Using only the transmission spectra, Q 0 and Q c cannot be determined via a single measurement of Q T , unless the coupling regime is known [1]. We present a novel method to characterize WGM and ringtype optical resonators [2]. Based on a Stokes parameters analysis, Q 0 and Q c can be distinctly identified for any coupling regime.

Experimental demonstration of application of ring down measurement approach to microcavities for biosensing

Cavity ring down measurement approach is a promising technique for biosensing as it is insensitive to intensity uctuations of a laser source. This technique in conjunction with ultra high Q microcavities have a great potential for ultra sensitive biosensing. Until now, most work on microcavity biosensors has been based on measurement of the resonant frequency shift induced by binding event on surface of the microcavity. Such measurements suer from the noise due to intensity uctuations of the laser source. However, the binding event will also introduce shift in quality factor of the microcavity, which can be tracked by using cavity ring down spectroscopy. In this work, we report on experimental demonstration of application of ring down measurement approach to microcavities for biosensing by tracking disassociation phase of a biotin-streptavidin reaction. These measurements were performed by using a bioconjugated ultra high Q microtoroidal cavity immersed in a liquid microacquarium. We found that disassociation curves agree with previously reported results on the protein kinetics measurements.

Whispering Gallery Modes intrinsic quality factor and coupling regime extraction using stokes parameters

We propose a novel method to characterize Whispering Gallery Modes and ring-type optical resonators. Based on a Stokes parameters analysis, the intrinsic Q-factor and the coupling Q-factor can be distinctly identified for any coupling regime.

High-Order Raman Scattering Emission in High-Q Factor As2S3 Microspher

Cascaded stimulated Raman scattering emission is reported in high-Q As₂S₃ microspheres for the first time. Stimulated Raman scattering emission is observed up to the 5^th order with a pump power of 500 μW at 1550 nm.