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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 6 — May. 26, 2009

Nanocavity plasmonic device for ultrabroadband single molecule sensing

Ryan M. Gelfand, Lukas Bruderer, and Hooman Mohseni  »View Author Affiliations


Optics Letters, Vol. 34, Issue 7, pp. 1087-1089 (2009)
http://dx.doi.org/10.1364/OL.34.001087


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Abstract

We present a new structure that combines a metal–dielectric–metal sandwich with a periodic structure to form a plasmon polariton photonic crystal. Three-dimensional finite-difference time-domain simulations show a clear bandgap in the terahertz regime. We exploited this property by adding a defect to the crystal, which produces a cavity with a quality factor of 23.3 at a wavelength of 3.45 μ m . Despite the small Q factor, the ultrasmall sensing volume of 15 zeptoliters produces an extremely large Purcell constant of 4.8 × 10 6 . Compared to photonic crystals with similar Purcell constant, the bandwidth is several orders of magnitude larger, or about 7 THz , ensuring high tolerances to manufacturing parameters, and environmental changes, as well as a high specificity owing to the possibility of broadband spectral fingerprint detection.

© 2009 Optical Society of America

OCIS Codes
(140.4780) Lasers and laser optics : Optical resonators
(040.2235) Detectors : Far infrared or terahertz
(160.5298) Materials : Photonic crystals
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Optoelectronics

History
Original Manuscript: October 17, 2008
Revised Manuscript: January 26, 2009
Manuscript Accepted: February 27, 2009
Published: March 30, 2009

Virtual Issues
Vol. 4, Iss. 6 Virtual Journal for Biomedical Optics

Citation
Ryan M. Gelfand, Lukas Bruderer, and Hooman Mohseni, "Nanocavity plasmonic device for ultrabroadband single molecule sensing," Opt. Lett. 34, 1087-1089 (2009)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ol-34-7-1087

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