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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 3 — Mar. 1, 2012
  • pp: 363–369

Using off-specular ellipsometry spectra of dielectric grating-coupled plasmon mode for biosensing

Mohammed Nadhim Abbas, Shih-Hsin Hsu, Yia-Chung Chang, and Yu-Ju Hung  »View Author Affiliations


JOSA B, Vol. 29, Issue 3, pp. 363-369 (2012)
http://dx.doi.org/10.1364/JOSAB.29.000363


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Abstract

We performed spectroscopic ellipsometry measurements of the specular and off-specular reflections of a one-dimensional polymethyl methacrylate grating on a Au-coated glass substrate and analyzed the data with efficient theoretical modeling. Very good agreement is obtained between calculation and experiment for both specular and off-specular reflections. It is found that the resonance peak of the off-specular reflection is much sharper than specular reflection at a wavelength that matches the condition for exciting the interface (surface plasmon) mode. When different media are used as the ambient, we found that the off-specular reflection near the surface-plasmon resonance can give significant enhancement in detection sensitivity compared with the corresponding specular reflection. This study may open a new way for biosensing. To analyze the data, we also developed a method to compute quasi-photonic band structures for periodic structures with frequency-dependent complex dielectric constants.

© 2012 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(240.6680) Optics at surfaces : Surface plasmons
(240.2130) Optics at surfaces : Ellipsometry and polarimetry

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: August 10, 2011
Revised Manuscript: November 26, 2011
Manuscript Accepted: November 26, 2011
Published: February 21, 2012

Virtual Issues
Vol. 7, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Mohammed Nadhim Abbas, Shih-Hsin Hsu, Yia-Chung Chang, and Yu-Ju Hung, "Using off-specular ellipsometry spectra of dielectric grating-coupled plasmon mode for biosensing," J. Opt. Soc. Am. B 29, 363-369 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-3-363

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