Refractometric Sensing with Periodic Nano-Indented Arrays: Effect of Structural Dimensions
by
Daniel J. Carney 1, Halldor G. Svavarsson 2,*
, Hafez Hemmati 1, Alexander Fannin 1, Jae W. Yoon 3 and Robert Magnusson 1
Daniel J. Carney 1, Halldor G. Svavarsson 2,*, Hafez Hemmati 1, Alexander Fannin 1, Jae W. Yoon 3 and Robert Magnusson 1
1
Department of Electrical Engineering, University of Texas at Arlington, Arlington, TX 76019, USA
2
School of Science and Engineering, Reykjavik University, 101 Reykjavik, Iceland
3
Electronics and Telecommunications Research Institute, Daejeon 34129, Korea
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(4), 897; https://doi.org/10.3390/s19040897
Received: 16 January 2019 / Revised: 4 February 2019 / Accepted: 18 February 2019 / Published: 21 February 2019
(This article belongs to the Section Biosensors)
Fabrication and sensor application of a simple plasmonic structure is described in this paper. The sensor element consists of nano-patterned gold film brought about from two-dimensional periodic photoresist templates created by holographic laser interference lithography. Reflectance spectroscopy revealed that the sensor exhibits significant refractive index sensitivity. A linear relationship between shifts in plasmonic resonances and changes in the refractive index were demonstrated. The sensor has a bulk sensitivity (SB) of 880 nm/refractive index unit and work under normal incidence conditions. This sensitivity exceeded that of many common types of plasmonic sensors with more intricate structures. A modeled spectral response was used to study the effect of its geometrical dimensions on plasmonic behavior. A qualitative agreement between the experimental spectra and modeled ones was obtained.
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Keywords:
refractometer; plasmonic sensors; biosensors; nanocups; periodic structures
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
MDPI and ACS Style
Carney, D.J.; Svavarsson, H.G.; Hemmati, H.; Fannin, A.; Yoon, J.W.; Magnusson, R. Refractometric Sensing with Periodic Nano-Indented Arrays: Effect of Structural Dimensions. Sensors 2019, 19, 897.
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