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Title: Tuning the exponential sensitivity of a bound-state-in-continuum optical sensor

Abstract

In this study, we investigate the evanescent field sensing mechanism provided by an all-dielectric metasurface supporting bound states in the continuum (BICs). The metasurface is based on a transparent photonic crystal with subwavelength thickness. The BIC electromagnetic field is localized along the direction normal to the photonic crystal nanoscale-thin slab (PhCS) because of a topology-induced confinement, exponentially decaying in the material to detect. On the other hand, it is totally delocalized in the PhCS plane, which favors versatile and multiplexing sensing schemes. Liquids with different refractive indices, ranging from 1.33 to 1.45, are infiltrated in a microfluidic chamber bonded to the sensing dielectric metasurface. We observe an experimental exponential sensitivity leading to differential values as large as 226 nm/RIU with excellent FOM. This behavior is explained in terms of the physical superposition of the field with the material under investigation and supported by a thorough numerical analysis. The mechanism is then translated to the case of molecular adsorption where a suitable theoretical engineering of the optical structure points out potential sensitivities as large as 4000 nm/RIU.

Authors:
ORCiD logo [1];  [2];  [1];  [3];  [3];  [1];  [1];  [1]
  1. National Research Council IMM, Naples (Italy)
  2. National Research Council IBP, Naples (Italy)
  3. National Research Lab. of Berkeley, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1596674
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 27; Journal Issue: 13; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Romano, Silvia, Zito, Gianluigi, Lara Yépez, Sofía N., Cabrini, Stefano, Penzo, Erika, Coppola, Giuseppe, Rendina, Ivo, and Mocellaark, Vito. Tuning the exponential sensitivity of a bound-state-in-continuum optical sensor. United States: N. p., 2019. Web. doi:10.1364/oe.27.018776.
Romano, Silvia, Zito, Gianluigi, Lara Yépez, Sofía N., Cabrini, Stefano, Penzo, Erika, Coppola, Giuseppe, Rendina, Ivo, & Mocellaark, Vito. Tuning the exponential sensitivity of a bound-state-in-continuum optical sensor. United States. doi:10.1364/oe.27.018776.
Romano, Silvia, Zito, Gianluigi, Lara Yépez, Sofía N., Cabrini, Stefano, Penzo, Erika, Coppola, Giuseppe, Rendina, Ivo, and Mocellaark, Vito. Wed . "Tuning the exponential sensitivity of a bound-state-in-continuum optical sensor". United States. doi:10.1364/oe.27.018776. https://www.osti.gov/servlets/purl/1596674.
@article{osti_1596674,
title = {Tuning the exponential sensitivity of a bound-state-in-continuum optical sensor},
author = {Romano, Silvia and Zito, Gianluigi and Lara Yépez, Sofía N. and Cabrini, Stefano and Penzo, Erika and Coppola, Giuseppe and Rendina, Ivo and Mocellaark, Vito},
abstractNote = {In this study, we investigate the evanescent field sensing mechanism provided by an all-dielectric metasurface supporting bound states in the continuum (BICs). The metasurface is based on a transparent photonic crystal with subwavelength thickness. The BIC electromagnetic field is localized along the direction normal to the photonic crystal nanoscale-thin slab (PhCS) because of a topology-induced confinement, exponentially decaying in the material to detect. On the other hand, it is totally delocalized in the PhCS plane, which favors versatile and multiplexing sensing schemes. Liquids with different refractive indices, ranging from 1.33 to 1.45, are infiltrated in a microfluidic chamber bonded to the sensing dielectric metasurface. We observe an experimental exponential sensitivity leading to differential values as large as 226 nm/RIU with excellent FOM. This behavior is explained in terms of the physical superposition of the field with the material under investigation and supported by a thorough numerical analysis. The mechanism is then translated to the case of molecular adsorption where a suitable theoretical engineering of the optical structure points out potential sensitivities as large as 4000 nm/RIU.},
doi = {10.1364/oe.27.018776},
journal = {Optics Express},
number = 13,
volume = 27,
place = {United States},
year = {2019},
month = {6}
}

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