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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 9, Iss. 5 — Apr. 29, 2014

Photonic crystal waveguide cavity with waist design for efficient trapping and detection of nanoparticles

Pin-Tso Lin, Tsan-Wen Lu, and Po-Tsung Lee  »View Author Affiliations

Optics Express, Vol. 22, Issue 6, pp. 6791-6800 (2014)

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For manipulating nanometric particles, we propose a photonic crystal waveguide cavity design with a waist structure to enhance resonance characteristic of the cavity. For trapping a polystyrene particle of 50 nm radius on the lateral side of the waist, the optical force can reach 2308 pN/W with 24.7% signal transmission. Threshold power of only 0.32 mW is required for stable trapping. The total length of the device is relatively short with only ten photonic crystal periods, and the trapping can occur precisely and only at the waist. The designed cavity can also provide particle detection and surrounding medium sensing using the transmission spectrum with narrow linewidth. The simulated figure of merit of 110.6 is relatively high compared with those obtained from most plasmonic structures for sensing application. We anticipate this design with features of compact, efficient, and versatile in functionality will be beneficial for developing lab-on-chip in the future.

© 2014 Optical Society of America

OCIS Codes
(230.7380) Optical devices : Waveguides, channeled
(350.4238) Other areas of optics : Nanophotonics and photonic crystals
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Photonic Crystals

Original Manuscript: December 20, 2013
Revised Manuscript: March 10, 2014
Manuscript Accepted: March 11, 2014
Published: March 17, 2014

Virtual Issues
Vol. 9, Iss. 5 Virtual Journal for Biomedical Optics

Pin-Tso Lin, Tsan-Wen Lu, and Po-Tsung Lee, "Photonic crystal waveguide cavity with waist design for efficient trapping and detection of nanoparticles," Opt. Express 22, 6791-6800 (2014)

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