On-chip single nanoparticle detection using ultra-high-Q whispering gallery microresonator

Lan Yang, Jiangang Zhu, Sahin Kaya Ozdemir, Lina He, Yunfeng Xiao, Lin Li, Da Ren Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Whispering gallery mode (WGM) optical microcavities trap light in micro-scale volumes by continuous total internal reflection which leads to enhancement of light intensity within a confined region and longer photon lifetime. Consequently, light-matter interaction is enhanced making the WGM resonator an extremely sensitive platform for the detection of perturbations in and around the resonator. Here, we report mode-splitting in monolithic ultra-high-Q WGM microcavities for real-time and in-situ detection of single nanoparticles. We investigate experimentally and theoretically particle detection and sizing at single nanoparticle resolution using the mode-splitting technique. Theoretical calculations are in good agreement with the experimental results. The mode-splitting effect provides a 'self-reference sensing' technique that can overcome the limitations of current resonator-based sensors and in the meantime keep the advantages offered by resonant structures for high-performance sensing.

Original languageEnglish (US)
Title of host publicationPhotonic Microdevices/Microstructures for Sensing II
StatePublished - 2010
EventPhotonic Microdevices/Microstructures for Sensing II - Orlando, FL, United States
Duration: Apr 7 2010Apr 8 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherPhotonic Microdevices/Microstructures for Sensing II
Country/TerritoryUnited States
CityOrlando, FL

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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