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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 16 — Jun. 1, 2007
  • pp: 3369–3375

Bandgap-assisted surface-plasmon sensing

Arnaud J. Benahmed and Chih-Ming Ho  »View Author Affiliations

Applied Optics, Vol. 46, Issue 16, pp. 3369-3375 (2007)

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Surface-plasmon resonance (SPR) is a sensing technique widely used for its label-free feature. However, its sensitivity is contingent on the divergence angle of the excitation beam. The problem becomes pronounced for compact systems when a low-cost LED is used as the light source. When the Kretschmann configuration with a periodically modulated surface is used, a bandgap appears in the surface plasmon dispersion relation. We recognize that the high density of modes on the edge of the surface-plasmon bandgap permits the coupling of a wider range of incidence angles of excitation photons to surface-plasmon polaritons than what is possible in the traditional Kretschmann configuration. Here, the numerical simulation illustrates that the sensitivity, detection limit, and reflectivity minimum of an amplitude-based SPR bandgap-assisted surface-plasmon sensor are almost independent of the divergence angle. Two different bandgap structures are compared with the Kretschmann configuration using the rigorous coupled-wave analysis technique. The results indicate that the bandgap-assisted sensing outperforms traditional SPR sensing when the angular standard deviation of the excitation beam is above 1°.

© 2007 Optical Society of America

OCIS Codes
(000.3110) General : Instruments, apparatus, and components common to the sciences
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(120.5700) Instrumentation, measurement, and metrology : Reflection
(130.6010) Integrated optics : Sensors
(240.6680) Optics at surfaces : Surface plasmons
(260.6970) Physical optics : Total internal reflection

ToC Category:
Optics at Surfaces

Original Manuscript: September 1, 2006
Revised Manuscript: January 30, 2007
Manuscript Accepted: January 30, 2007
Published: May 15, 2007

Arnaud J. Benahmed and Chih-Ming Ho, "Bandgap-assisted surface-plasmon sensing," Appl. Opt. 46, 3369-3375 (2007)

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