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Sensors (Basel). 2019 Feb 21;19(4). pii: E897. doi: 10.3390/s19040897.

Refractometric Sensing with Periodic Nano-Indented Arrays: Effect of Structural Dimensions.

Author information

1
Department of Electrical Engineering, University of Texas at Arlington, Arlington, TX 76019, USA. daniel.carney@mavs.uta.edu.
2
School of Science and Engineering, Reykjavik University, 101 Reykjavik, Iceland. halldorsv@ru.is.
3
Department of Electrical Engineering, University of Texas at Arlington, Arlington, TX 76019, USA. hafez.hemmati@mavs.uta.edu.
4
Department of Electrical Engineering, University of Texas at Arlington, Arlington, TX 76019, USA. alexander.fannin@mavs.uta.edu.
5
Electronics and Telecommunications Research Institute, Daejeon 34129, Korea. jaeong.yoon@gmail.com.
6
Department of Electrical Engineering, University of Texas at Arlington, Arlington, TX 76019, USA. magnusson@uta.edu.

Abstract

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.

KEYWORDS:

biosensors; nanocups; periodic structures; plasmonic sensors; refractometer

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