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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 13 — Jul. 1, 2014
  • pp: 3946–3949

Multimode spectroscopy using dielectric grating coupled to a surface plasmon resonance sensor

Farshid Bahrami, J. Stewart Aitchison, and Mo Mojahedi  »View Author Affiliations


Optics Letters, Vol. 39, Issue 13, pp. 3946-3949 (2014)
http://dx.doi.org/10.1364/OL.39.003946


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Abstract

A new platform is proposed to solve one of the main shortcomings of surface plasmon resonance biosensors, namely, the cross sensitivity to surface and bulk effects. This approach is based on multimode spectroscopy in which three different modes are excited simultaneously. The proposed design consists of an SPR sensor loaded with a dielectric grating. The design parameters (dimensions and wavelength) are optimized with a genetic algorithm. The optimized design has two resonance modes excited with TM polarized light, each sensitive to surface effects, and one TE mode mostly sensitive to variations in the bulk fluid refractive index. Numerical and analytical methods are used to justify the simulation results, which are in good agreement. Finally, it is shown that, by applying three-mode spectroscopy, decoupling the properties of the attached biomaterial from the background index variations is possible with the proposed design.

© 2014 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Remote Sensing and Sensors

History
Original Manuscript: January 28, 2014
Revised Manuscript: May 9, 2014
Manuscript Accepted: May 23, 2014
Published: June 26, 2014

Citation
Farshid Bahrami, J. Stewart Aitchison, and Mo Mojahedi, "Multimode spectroscopy using dielectric grating coupled to a surface plasmon resonance sensor," Opt. Lett. 39, 3946-3949 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-13-3946


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