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Nanomaterials 2018, 8(10), 809; https://doi.org/10.3390/nano8100809

The Role of Rayleigh-Wood Anomalies and Surface Plasmons in Optical Enhancement for Nano-Gratings

1
Microelectronics-Photonics Graduate Program, 731 W. Dickson St., University of Arkansas, Fayetteville, Arkansas, AR 72701, USA
2
Department of Physics, College of Science, AL-Nahrain University, Baghdad 10072, Iraq
3
Department of Physics, 825 W. Dickson St., University of Arkansas, Fayetteville, Arkansas, AR 72701, USA
4
R.B. Annis School of Engineering, University of Indianapolis, Indianapolis, IN 46227, USA
*
Author to whom correspondence should be addressed.
Received: 6 September 2018 / Revised: 1 October 2018 / Accepted: 4 October 2018 / Published: 9 October 2018
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Abstract

We propose and report on the design of a 1-D metallo-dielectric nano-grating on a GaAs substrate. We numerically study the impact of grating period, slit and wire widths, and irradiating angle of incidence on the optical response. The optimal wire width, w = 160 nm, was chosen based on previous results from investigations into the influence of wire width and nano-slit dimensions on optical and electrical enhancements in metal-semiconductor-metal photodetectors. In this present project, resonant absorption and reflection modes were observed while varying the wire and nano-slit widths to study the unique optical modes generated by Rayleigh-Wood anomalies and surface plasmon polaritons. We observed sharp and diffuse changes in optical response to these anomalies, which may potentially be useful in applications such as photo-sensing and photodetectors. Additionally, we found that varying the slit width produced sharper, more intense anomalies in the optical spectrum than varying the wire width. View Full-Text
Keywords: plasmonics; nano-optics; Rayleigh-Wood anomalies; photo-sensing plasmonics; nano-optics; Rayleigh-Wood anomalies; photo-sensing
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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 (CC BY 4.0).
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Darweesh, A.A.; Bauman, S.J.; Debu, D.T.; Herzog, J.B. The Role of Rayleigh-Wood Anomalies and Surface Plasmons in Optical Enhancement for Nano-Gratings. Nanomaterials 2018, 8, 809.

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