In this paper the performance of an optical organic sensor based on a plasmonic grating immersed in an asymmetric dielectric environment is investigated. Metal gratings offer the possibility to tailor the spectral response, in dependence of the geometrical parameter settings and variation of the refractive index of the surrounding media. It is then possible to obtain a reflection spectrum displaying a sharp dip that can be efficiently exploited to improve the detection of small quantities of organic materials. In particular, using a finite difference time domain (FDTD) based method, we demonstrate that the designed plasmonic grating, made of gold strips placed on a silicon substrate and covered by a generic organic material (analyte), exhibits an improved sensitivity for the detection of the overlayer thickness (analyte quantity). Nevertheless, this plasmonic sensor can also be used to determine the typology of the generic organic layer in dependence of the refractive index change. (C) 2011 Elsevier B.V. All rights reserved.
机构:
Univ Calif Berkeley, Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USAUniv Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
Cubukcu, Ertugrul
;
Zhang, Shuang
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Univ Calif Berkeley, Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USAUniv Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
Zhang, Shuang
;
Park, Yong-Shik
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Univ Calif Berkeley, Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USAUniv Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
Park, Yong-Shik
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Bartal, Guy
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Univ Calif Berkeley, Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USAUniv Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
Bartal, Guy
;
Zhang, Xiang
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Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
Univ Calif Berkeley, Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USAUniv Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
机构:
Univ Illinois, Dept Phys, Urbana, IL 61801 USA
Univ Illinois, Ctr Phys Living Cells, Urbana, IL 61801 USAUniv Illinois, Dept Phys, Urbana, IL 61801 USA
Diao, J. J.
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Cao, Qing
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Univ Illinois, Dept Chem, Urbana, IL 61801 USAUniv Illinois, Dept Phys, Urbana, IL 61801 USA
机构:
Univ Calif Berkeley, Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USAUniv Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
Cubukcu, Ertugrul
;
Zhang, Shuang
论文数: 0引用数: 0
h-index: 0
机构:
Univ Calif Berkeley, Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USAUniv Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
Zhang, Shuang
;
Park, Yong-Shik
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h-index: 0
机构:
Univ Calif Berkeley, Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USAUniv Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
Park, Yong-Shik
;
Bartal, Guy
论文数: 0引用数: 0
h-index: 0
机构:
Univ Calif Berkeley, Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USAUniv Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
Bartal, Guy
;
Zhang, Xiang
论文数: 0引用数: 0
h-index: 0
机构:
Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
Univ Calif Berkeley, Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USAUniv Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
机构:
Univ Illinois, Dept Phys, Urbana, IL 61801 USA
Univ Illinois, Ctr Phys Living Cells, Urbana, IL 61801 USAUniv Illinois, Dept Phys, Urbana, IL 61801 USA
Diao, J. J.
;
Cao, Qing
论文数: 0引用数: 0
h-index: 0
机构:
Univ Illinois, Dept Chem, Urbana, IL 61801 USAUniv Illinois, Dept Phys, Urbana, IL 61801 USA