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We report real time detection of individual nanoparticles down to R=20 nm using a high-Q whispering gallery mode (WGM) microresonator. The detection is based on resonance enhanced particle induced reflection and does not require monitoring resonance spectra.
We present spectra evolution of photonic molecules upon individual or collective coupling of supermodes in one resonator with single mode in the other one by tuning the coupling strength and spectral overlap of the modes.
Whispering-Gallery-Mode(WGM) resonators can significantly enhance light-matter interaction. We discuss self-pulsing behaviors in WGM microlasers due to nonlinear optical losses introduced by excited state absorption. Ultra-sensitive self-referencing detection of nanoparticles using WGM microlasers is demonstrated.
A nanoparticle detection scheme with single particle resolution is presented. The sensor contains only a taper fiber, thus offering the advantages of compactness and installation flexibility. The sensing method is based on monitoring the transmitted light power which shows abrupt jumps with each particle binding to the taper surface. The experimental validation of the sensor is demonstrated with polystyrene...
Scattering process in a microcavity coupled to subwavelength scatterers is investigated using synthetic nanoparticles, Erbium ions and Influenza A virions. Direct and single-shot estimation of Purcell factor is demonstrated using the scatterer-induced mode-splitting spectra.
Investigation of the dynamics of mode splitting manipulated by two scatterers in an optical microresonator is presented. The experimental results are explained by a multiple-scatterer theory and the applications on nanoparticle detection and sizing are discussed.
We demonstrate detection and sizing of single nanoparticles down to 30 nm by monitoring the mode splitting induced by a nanoparticle in an ultra-high quality factor (UHQ) microtoroid. Theory and methods are discussed.
Scattering induced mode splitting in microcavities with gain medium is detected directly using heterodyne technique without wavelength scan around resonant modes. Optical gain helps resolve small mode splittings, which might be missed in passive microcavities.
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