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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 19 — Sep. 15, 2008
  • pp: 14597–14602

Improving the sensitivity of SPR sensors based on gratings by double-dips method (DDM)

Debin Cai, Yonghua Lu, Kaiqun Lin, Pei Wang, and Hai Ming  »View Author Affiliations

Optics Express, Vol. 16, Issue 19, pp. 14597-14602 (2008)

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The sensitivity of surface plasmon resonance (SPR) sensors based on gratings using angular interrogation is improved by optimizing the 1st-order diffraction dip recently but still can not exceed the prism-based systems. To improve the sensitivity of grating-based systems in another way, we realize sharp dips of the higher diffraction orders and propose double-dips method (DDM), a new way using the separation of two sharp dips of different orders to improve the sensitivity of SPR sensors based on gratings with good linearity. By DDM, the grating-based systems’ sensitivity is improved into more than 237 deg/RIU, more sensitive than the prism-based systems in the same condition, and the quality parameter χ factor reaches more than 95. In different performance comparisons, DDM has roundly better performances than other methods. Moreover, when the grating profile errs from rectangle, DDM still works well.

© 2008 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(240.6680) Optics at surfaces : Surface plasmons
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Diffraction and Gratings

Original Manuscript: July 3, 2008
Revised Manuscript: August 15, 2008
Manuscript Accepted: August 15, 2008
Published: September 2, 2008

Debin Cai, Yonghua Lu, Kaiqun Lin, Pei Wang, and Hai Ming, "Improving the sensitivity of SPR sensors based on gratings by double-dips method (DDM)," Opt. Express 16, 14597-14602 (2008)

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