The Role of Rayleigh-Wood Anomalies and Surface Plasmons in Optical Enhancement for Nano-Gratings
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Microelectronics-Photonics Graduate Program, 731 W. Dickson St., University of Arkansas, Fayetteville, Arkansas, AR 72701, USA
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Department of Physics, College of Science, AL-Nahrain University, Baghdad 10072, Iraq
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Department of Physics, 825 W. Dickson St., University of Arkansas, Fayetteville, Arkansas, AR 72701, USA
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R.B. Annis School of Engineering, University of Indianapolis, Indianapolis, IN 46227, USA
*
Author to whom correspondence should be addressed.
Nanomaterials 2018, 8(10), 809; https://doi.org/10.3390/nano8100809
Received: 6 September 2018
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Revised: 1 October 2018
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Accepted: 4 October 2018
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Published: 9 October 2018
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.
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Keywords:
plasmonics; nano-optics; Rayleigh-Wood anomalies; photo-sensing
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MDPI and ACS Style
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. https://doi.org/10.3390/nano8100809
AMA Style
Darweesh AA, Bauman SJ, Debu DT, Herzog JB. The Role of Rayleigh-Wood Anomalies and Surface Plasmons in Optical Enhancement for Nano-Gratings. Nanomaterials. 2018; 8(10):809. https://doi.org/10.3390/nano8100809
Chicago/Turabian StyleDarweesh, Ahmad A., Stephen J. Bauman, Desalegn T. Debu, and Joseph B. Herzog. 2018. "The Role of Rayleigh-Wood Anomalies and Surface Plasmons in Optical Enhancement for Nano-Gratings" Nanomaterials 8, no. 10: 809. https://doi.org/10.3390/nano8100809
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