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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 12 — Jun. 4, 2012
  • pp: 12850–12859

Enhanced fluorescence in a nanoporous waveguide and its quantitative analysis

Yong Fan, Kazuhiro Hotta, Akira Yamaguchi, and Norio Teramae  »View Author Affiliations


Optics Express, Vol. 20, Issue 12, pp. 12850-12859 (2012)
http://dx.doi.org/10.1364/OE.20.012850


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Abstract

Fluorescence behavior was examined for fluorophore-labeled protein (BSA-AF) adsorbed on the nanopore surface of a nanoporous waveguiding film. The waveguiding film has a bilayer structure of a porous anodic alumina (PAA) layer on a metallic aluminum (Al) layer, and this structure allows efficient interaction of fluorophores entrapped in the nanoporous waveguiding film with a hotspot of the enhanced electromagnetic field of the waveguide modes. Fluorescence response of BSA-AF depends on the enhanced field within the waveguiding film and the enlarged adsorbed amount in the PAA layer where most of the light is confined. Enhancement of the field in the waveguiding film can be controlled by the refractive index of the PAA layer and enlargement of the pore size efficiently affects the enhancement of the fluorescence response. Compared to the film without a PAA layer, the PAA/Al film exhibits more than 140-fold larger fluorescence response due to the large adsorption capacity of the PAA nanopores and the enhanced field formed by the waveguide modes in the PAA layer with a low refractive index.

© 2012 OSA

OCIS Codes
(230.7370) Optical devices : Waveguides
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
(160.4236) Materials : Nanomaterials
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Spectroscopy

History
Original Manuscript: February 10, 2012
Revised Manuscript: March 18, 2012
Manuscript Accepted: March 19, 2012
Published: May 23, 2012

Citation
Yong Fan, Kazuhiro Hotta, Akira Yamaguchi, and Norio Teramae, "Enhanced fluorescence in a nanoporous waveguide and its quantitative analysis," Opt. Express 20, 12850-12859 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-12-12850


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