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An Inverted Honeycomb Plasmonic Lattice as an Efficient Refractive Index Sensor.

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Title: An Inverted Honeycomb Plasmonic Lattice as an Efficient Refractive Index Sensor.
Authors: Rodríguez-Álvarez, Javier1,2 (AUTHOR) javier.rodriguez@ub.edu, Gnoatto, Lorenzo1 (AUTHOR) martinezcastellsmarc@gmail.com, Martínez-Castells, Marc1 (AUTHOR) arantxa.fraile@ub.edu, Guerrero, Albert3 (AUTHOR) albert.guerrero@imb-cnm.csic.es, Borrisé, Xavier4 (AUTHOR) xavier.borrise@imb-cnm.csic.es, Fraile Rodríguez, Arantxa1,2 (AUTHOR) xavierbatlle@ub.edu, Batlle, Xavier1,2 (AUTHOR) amilcar.labarta@ub.edu, Labarta, Amílcar1,2 (AUTHOR), Iacopino, Daniela (AUTHOR)
Source: Nanomaterials (2079-4991). May2021, Vol. 11 Issue 5, p1217. 1p.
Subjects: Refractive index, Electron beam lithography, Honeycomb structures, Photolithography, Detectors, Materials testing
Abstract: We present an efficient refractive index sensor consisting of a heterostructure that contains an Au inverted honeycomb lattice as a main sensing element. Our design aims at maximizing the out-of-plane near-field distributions of the collective modes of the lattice mapping the sensor surroundings. These modes are further enhanced by a patterned SiO2 layer with the same inverted honeycomb lattice, an SiO2 spacer, and an Au mirror underneath the Au sensing layer that contribute to achieving a high performance. The optical response of the heterostructure was studied by numerical simulation. The results corresponding to one of the collective modes showed high sensitivity values ranging from 99 to 395 nm/RIU for relatively thin layers of test materials within 50 and 200 nm. In addition, the figure of merit of the sensor detecting slight changes of the refractive index of a water medium at a fixed wavelength was as high as 199 RIU−1. As an experimental proof of concept, the heterostructure was manufactured by a simple method based on electron beam lithography and the measured optical response reproduces the simulations. This work paves the way for improving both the sensitivity of plasmonic sensors and the signal of some enhanced surface spectroscopies. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: An Inverted Honeycomb Plasmonic Lattice as an Efficient Refractive Index Sensor.
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  Data: <searchLink fieldCode="DE" term="%22Refractive+index%22">Refractive index</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+beam+lithography%22">Electron beam lithography</searchLink><br /><searchLink fieldCode="DE" term="%22Honeycomb+structures%22">Honeycomb structures</searchLink><br /><searchLink fieldCode="DE" term="%22Photolithography%22">Photolithography</searchLink><br /><searchLink fieldCode="DE" term="%22Detectors%22">Detectors</searchLink><br /><searchLink fieldCode="DE" term="%22Materials+testing%22">Materials testing</searchLink>
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  Data: We present an efficient refractive index sensor consisting of a heterostructure that contains an Au inverted honeycomb lattice as a main sensing element. Our design aims at maximizing the out-of-plane near-field distributions of the collective modes of the lattice mapping the sensor surroundings. These modes are further enhanced by a patterned SiO2 layer with the same inverted honeycomb lattice, an SiO2 spacer, and an Au mirror underneath the Au sensing layer that contribute to achieving a high performance. The optical response of the heterostructure was studied by numerical simulation. The results corresponding to one of the collective modes showed high sensitivity values ranging from 99 to 395 nm/RIU for relatively thin layers of test materials within 50 and 200 nm. In addition, the figure of merit of the sensor detecting slight changes of the refractive index of a water medium at a fixed wavelength was as high as 199 RIU−1. As an experimental proof of concept, the heterostructure was manufactured by a simple method based on electron beam lithography and the measured optical response reproduces the simulations. This work paves the way for improving both the sensitivity of plasmonic sensors and the signal of some enhanced surface spectroscopies. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – SubjectFull: Refractive index
        Type: general
      – SubjectFull: Electron beam lithography
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      – SubjectFull: Honeycomb structures
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      – SubjectFull: Materials testing
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              Text: May2021
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