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Proceedings Paper

On-chip single nanoparticle detection using ultra-high-Q whispering gallery microresonator
Author(s): Lan Yang; Jiangang Zhu; Sahin Kaya Ozdemir; Lina He; Yunfeng Xiao; Lin Li; Da-Ren Chen
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Paper Abstract

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.

Paper Details

Date Published: 28 April 2010
PDF: 11 pages
Proc. SPIE 7682, Photonic Microdevices/Microstructures for Sensing II, 76820B (28 April 2010); doi: 10.1117/12.850662
Show Author Affiliations
Lan Yang, Washington Univ. in St. Louis (United States)
Jiangang Zhu, Washington Univ. in St. Louis (United States)
Sahin Kaya Ozdemir, Washington Univ. in St. Louis (United States)
Lina He, Washington Univ. in St. Louis (United States)
Yunfeng Xiao, Washington Univ. in St. Louis (United States)
Lin Li, Washington Univ. in St. Louis (United States)
Da-Ren Chen, Washington Univ. in St. Louis (United States)

Published in SPIE Proceedings Vol. 7682:
Photonic Microdevices/Microstructures for Sensing II
Xudong Fan; Hai Xiao; Anbo Wang, Editor(s)

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