Degeneracy breaking of Wood's anomaly for enhanced refractive index sensing

Michal Eitan; Zeev Iluz; Yuval Yifat; Amir Boag; Yael Hanein; Jacob Scheuer

doi:10.1021/acsphotonics.5b00091

Degeneracy breaking of Wood's anomaly for enhanced refractive index sensing

Michal Eitan, Zeev Iluz, Yuval Yifat, Amir Boag, Yael Hanein, Jacob Scheuer^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

41 Scopus citations

Abstract

We introduce an ultrasensitive detection technique for refractive index (RI) sensing 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 this is the combination of a narrowband resonance of the slot-antennas with degeneracy breaking of Wood's anomaly under slightly nonperpendicular illumination. In addition, we explore the sensitivity of the device to the depth 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 useful for numerous sensing applications.

Original language	English
Pages (from-to)	615-621
Number of pages	7
Journal	ACS Photonics
Volume	2
Issue number	5
DOIs	https://doi.org/10.1021/acsphotonics.5b00091
State	Published - 20 May 2015

Keywords

Wood's anomaly
figure of merit (FOM)
nanoantennas
refractive index sensing
surface plasmon resonance

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10.1021/acsphotonics.5b00091

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abstract = "We introduce an ultrasensitive detection technique for refractive index (RI) sensing 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 this is the combination of a narrowband resonance of the slot-antennas with degeneracy breaking of Wood's anomaly under slightly nonperpendicular illumination. In addition, we explore the sensitivity of the device to the depth 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 useful for numerous sensing applications.",

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author = "Michal Eitan and Zeev Iluz and Yuval Yifat and Amir Boag and Yael Hanein and Jacob Scheuer",

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AU - Eitan, Michal

AU - Iluz, Zeev

AU - Yifat, Yuval

AU - Boag, Amir

AU - Hanein, Yael

AU - Scheuer, Jacob

PY - 2015/5/20

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AB - We introduce an ultrasensitive detection technique for refractive index (RI) sensing 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 this is the combination of a narrowband resonance of the slot-antennas with degeneracy breaking of Wood's anomaly under slightly nonperpendicular illumination. In addition, we explore the sensitivity of the device to the depth 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 useful for numerous sensing applications.

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Degeneracy breaking of Wood's anomaly for enhanced refractive index sensing

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