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Ultra-high-quality optical resonators and Ultra-low-threshold silicon-based microlasers

 

Our research interests are fabrication, characterization, and fundamental understanding of advanced nano/micro photonic devices with outstanding optical properties.

 

On-chip nanoparticle detection and sizing using mode splitting

 

Particle binding splits a whispering-gallery mode into two spectrally shifted resonance modes, forming a self-referenced detection scheme. This technique provides superior noise suppression and enables the extraction of accurate particle size information with a single-shot measurement in a microscale device. 

Detecting single viruses and nanoparticles using whispering gallery microlasers

 

We developed a whispering gallery mode microlaser-based real-time and label-free detection method that can detect individual 15-nm-radius polystyrene nanoparticles, 10-nm gold nanoparticles and influenza A virions in air, and 30 nm polystyrene nanoparticles in water. The ultimate detection limit is set by the laser linewidth, which can be made much narrower than the resonance linewidth of any passive resonator.

 

Ultra-low-threshold silicon-based microlasers

 

Featuring ultra-compact size and ultra-low power usage, these on-chip microlasers have applications ranging from communication to sensing.