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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 5 — Mar. 11, 2013
  • pp: 5859–5871

Plasmonic interferometers for label-free multiplexed sensing

Yongkang Gao, Zheming Xin, Qiaoqiang Gan, Xuanhong Cheng, and Filbert J. Bartoli  »View Author Affiliations

Optics Express, Vol. 21, Issue 5, pp. 5859-5871 (2013)

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We report a plasmonic interferometric biosensor based on a simple slit-groove metallic nanostructure that monitors the phase changes of surface plasmon polaritons resulting from biomolecular adsorptions. The proposed sensing scheme integrates the strengths of miniaturized plasmonic architectures with sensitive optical interferometry techniques. Sensing peak linewidths as narrow as 7 nm and refractive index resolutions of 1 × 10−5 RIU were experimentally measured from a miniaturized sensing area of 10 × 30 µm2 using a collinear transmission setup and a low-cost compact spectrometer. A high-density array of such interferometric sensors was also fabricated to demonstrate its potential for real-time multiplexed sensing using a CCD camera for intensity interrogation. A self-referencing method was introduced to increase the sensitivity and reduce sensor noise for multiplexing measurements. The enhanced sensing performance, small sensor footprint, and simple instrumentation and optical alignment suggest promise to integrate this platform into low-cost label-free biosensing devices with high multiplexing capabilities.

© 2013 OSA

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(130.6010) Integrated optics : Sensors
(240.6680) Optics at surfaces : Surface plasmons
(220.4241) Optical design and fabrication : Nanostructure fabrication
(250.5403) Optoelectronics : Plasmonics

ToC Category:

Original Manuscript: December 19, 2012
Revised Manuscript: January 30, 2013
Manuscript Accepted: January 30, 2013
Published: March 1, 2013

Virtual Issues
Vol. 8, Iss. 4 Virtual Journal for Biomedical Optics

Yongkang Gao, Zheming Xin, Qiaoqiang Gan, Xuanhong Cheng, and Filbert J. Bartoli, "Plasmonic interferometers for label-free multiplexed sensing," Opt. Express 21, 5859-5871 (2013)

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