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

Journal Article · · Optics Express
DOI:https://doi.org/10.1364/oe.27.018776· OSTI ID:1596674
 [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)
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.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1596674
Journal Information:
Optics Express, Journal Name: Optics Express Journal Issue: 13 Vol. 27; ISSN 1094-4087; ISSN OPEXFF
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English

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Observation of spin-polarized directive coupling of light at bound states in the continuum journal January 2019

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