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

被引：33

作者：

Grande, Marco ^{[1
]}

Vincenti, Maria Antonietta ^{[6
]}

Stomeo, Tiziana ^{[2
]}

Morea, Giuseppe ^{[1
]}

Marani, Roberto ^{[1
]}

Marrocco, Valeria ^{[1
,4
]}

Petruzzelli, Vincenzo ^{[1
]}

D'Orazio, Antonella ^{[1
]}

Cingolani, Roberto ^{[2
]}

De Vittorio, Massimo ^{[2
,3
]}

de Ceglia, Domenico ^{[6
]}

Scalora, Michael ^{[5
]}

机构：

[1] Politecn Bari, Dipartimento Elettrotecn & Elettron, I-70125 Bari, Italy

[2] IIT, Ctr Biomol Nanotechnol, I-73010 Lecce, Italy

[3] Univ Salento, Dip Ingn Innovaz, CNR, Ist Nanosci,NNL, I-73100 Lecce, Italy

[4] CNR, ITIA, I-70125 Bari, Italy

[5] RDECOM, Charles M Bowden Res Ctr, Redstone Arsenal, AL 35898 USA

[6] AEgis Technol Inc, Huntsville, AL 35806 USA

来源：

OPTICS EXPRESS | 2011年 / 19卷 / 22期

关键词：

DIFFRACTION GRATINGS; RESONANCE SENSORS; NANOPARTICLES; LIGHT; WAVES;

D O I：

10.1364/OE.19.021385

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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. (C) 2011 The Optical Society of America

引用

页码：21385 / 21395

页数：11

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