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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 22 — Oct. 24, 2011
  • pp: 21385–21395

Experimental demonstration of a novel bio‑sensing platform via plasmonic band gap formation in gold nano‑patch arrays

Marco Grande, Maria Antonietta Vincenti, Tiziana Stomeo, Giuseppe Morea, Roberto Marani, Valeria Marrocco, Vincenzo Petruzzelli, Antonella D’Orazio, Roberto Cingolani, Massimo De Vittorio, Domenico de Ceglia, and Michael Scalora  »View Author Affiliations

Optics Express, Vol. 19, Issue 22, pp. 21385-21395 (2011)

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In this paper we discuss the possibility of implementing a novel bio-sensing platform based on the observation of the shift of the leaky surface plasmon mode that occurs at the edge of the plasmonic band gap of metal gratings, when an analyte is deposited on top of the metallic structure. We report numerical calculations, fabrication and experimental measurements to prove the sensing capability of a two-dimensional array of gold nano-patches in the detection of a small quantity of Isopropyl Alcohol (IPA) deposited on top of sensor surface. The calculated sensitivity of our device approaches a value of 1000 nm/RIU with a corresponding Figure of Merit (FOM) of 222 RIU−1. The presence of IPA can also be visually estimated by observing a color variation in the diffracted field. We show that color brightness and intensity variations can be ascribed to a change in the aperture size, keeping the periodicity constant, and to different types of analyte deposited on the sample, respectively. Moreover, we demonstrate that unavoidable fabrication imperfections revealed by the presence of rounded corners and surface roughness do not significantly affect device performance.

© 2011 OSA

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:

Original Manuscript: August 3, 2011
Revised Manuscript: August 29, 2011
Manuscript Accepted: September 3, 2011
Published: October 13, 2011

Virtual Issues
Vol. 6, Iss. 11 Virtual Journal for Biomedical Optics

Marco Grande, Maria Antonietta Vincenti, Tiziana Stomeo, Giuseppe Morea, Roberto Marani, Valeria Marrocco, Vincenzo Petruzzelli, Antonella D’Orazio, Roberto Cingolani, Massimo De Vittorio, Domenico de Ceglia, and Michael Scalora, "Experimental demonstration of a novel bio‑sensing platform via plasmonic band gap formation in gold nano‑patch arrays," Opt. Express 19, 21385-21395 (2011)

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