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Proceedings Paper

Nano slot-antenna array refractive index sensors: approaching the conventional theoretical limit of the figure of merit
Author(s): Michal Eitan; Yuval Yifat; Zeev Iluz; Amir Boag; Yael Hanein; Jacob Scheuer
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Paper Abstract

We demonstrate a refractive index (RI) detection technique based on an array of nanometer scale slot-antennas milled in a thin gold layer using a single lithographic step. Our experimental Figures of merit (FOMs) of 140-210 in the telecom wavelength range approach the fundamental limit for standard propagating SPR sensors (~250). The underlying mechanism enabling such high FOMs is the combination of a narrowband resonance of the slot-antennas with degeneracy breaking of Wood’s anomaly under slightly non-perpendicular illumination. In addition, we study the sensitivity of the thickness of the analyte layer. This concept can be easily tuned to any desired wavelength and RI range by modifying the slot dimensions and the array spacing, thus rendering it highly attractive for numerous sensing applications.

Paper Details

Date Published: 5 May 2015
PDF: 19 pages
Proc. SPIE 9506, Optical Sensors 2015, 95060S (5 May 2015); doi: 10.1117/12.2183101
Show Author Affiliations
Michal Eitan, Tel Aviv Univ. (Israel)
Yuval Yifat, Tel Aviv Univ. (Israel)
Zeev Iluz, CST AG (Germany)
Amir Boag, Tel Aviv Univ. (Israel)
Yael Hanein, Tel Aviv Univ. (Israel)
Jacob Scheuer, Tel Aviv Univ. (Israel)

Published in SPIE Proceedings Vol. 9506:
Optical Sensors 2015
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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