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Proceedings Paper

Fractal aluminum Cayley-trees to design plasmonic ultraviolet photodetectors
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Paper Abstract

Plasmonic ultraviolet (UV) photodetectors have witnessed ongoing and tremendous enhancements in quantum efficiency and responsivity. Here, we go beyond regular plasmonic detectors by using periodic arrays of fractal aluminum nanostructures as Cayley trees deposited on a Ga2O3 substrate to generate photocurrent. We show that the proposed aluminum Cayley trees are able to support and intensify strong broad plasmon resonant modes across the UV to the visible spectrum. It is shown that the Cayley trees can be tailored to facilitate strong absorption at high energies (short wavelengths), resulting formation of hot carriers. Having perfect compatibility to operate at the UV spectrum, fractal aluminum structures and Ga2O3 substrate help to increase the produced photocurrent remarkably. Presence of Ga2O3 layer blue-shifts the peak of absorption to higher energies and helps to generate hot carriers at deeper UV wavelengths.

Paper Details

Date Published: 25 May 2016
PDF: 6 pages
Proc. SPIE 9836, Micro- and Nanotechnology Sensors, Systems, and Applications VIII, 98362Y (25 May 2016); doi: 10.1117/12.2224333
Show Author Affiliations
A. Ahmadivand, Florida International Univ. (United States)
R. Sinha, Florida International Univ. (United States)
M. Karabiyik, Florida International Univ. (United States)
S. Kaya, Florida International Univ. (United States)
N. Pala, Florida International Univ. (United States)

Published in SPIE Proceedings Vol. 9836:
Micro- and Nanotechnology Sensors, Systems, and Applications VIII
Thomas George; Achyut K. Dutta; M. Saif Islam, Editor(s)

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