Journal
NANOMATERIALS
Volume 8, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/nano8100809
Keywords
plasmonics; nano-optics; Rayleigh-Wood anomalies; photo-sensing
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Funding
- Iraqi Ministry of Higher Education and Scientific Research (MoHESR) - Doctoral Academy Fellowship through the University of Arkansas Graduate School
- SPIE Optics and Photonics Education Scholarship
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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, omega = 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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