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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. 5, Iss. 12 — Sep. 30, 2010

Improving weak-signal identification via predetection background suppression by a pixel-level, surface-wave enabled dark-field aperture

Guoan Zheng and Changhuei Yang  »View Author Affiliations


Optics Letters, Vol. 35, Issue 15, pp. 2636-2638 (2010)
http://dx.doi.org/10.1364/OL.35.002636


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Abstract

We report the successful implementation of a surface-wave enabled dark-field aperture (SWEDA) directly on a complementary metal-oxide semiconductor sensor pixel ( 2.2 μ m ). This SWEDA pixel allows predetection cancellation of a uniform coherent background. We show that the signal-to-noise ratio (SNR) of the SWEDA pixel is better than that of a single undressed pixel over a significant range of signal-to-background ratio (SBR). For a small SBR value ( SBR = 0.001 , background intensity = 3.96 W / m 2 , integration time = 5 ms ), we further demonstrate that a SWEDA pixel can detect a weak localized signal buried in a high background, while conventional postdetection background subtraction cannot (improved SNR = 2.2 versus SNR = 0.26 ).

© 2010 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(240.6680) Optics at surfaces : Surface plasmons
(250.5403) Optoelectronics : Plasmonics
(250.0040) Optoelectronics : Detectors

ToC Category:
Detectors

History
Original Manuscript: April 13, 2010
Revised Manuscript: June 24, 2010
Manuscript Accepted: July 4, 2010
Published: July 29, 2010

Virtual Issues
Vol. 5, Iss. 12 Virtual Journal for Biomedical Optics

Citation
Guoan Zheng and Changhuei Yang, "Improving weak-signal identification via predetection background suppression by a pixel-level, surface-wave enabled dark-field aperture," Opt. Lett. 35, 2636-2638 (2010)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ol-35-15-2636


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