Fractal aluminum Cayley-trees to design plasmonic ultraviolet photodetectors

A. Ahmadivand; R. Sinha; M. Karabiyik; S. Kaya; N. Pala

doi:10.1117/12.2224333

25 May 2016 Fractal aluminum Cayley-trees to design plasmonic ultraviolet photodetectors

A. Ahmadivand, R. Sinha, M. Karabiyik, S. Kaya, N. Pala

Proceedings Volume 9836, Micro- and Nanotechnology Sensors, Systems, and Applications VIII; 98362Y (2016) https://doi.org/10.1117/12.2224333
Event: SPIE Defense + Security, 2016, Baltimore, MD, United States

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.

Citation Download Citation

A. Ahmadivand, R. Sinha, M. Karabiyik, S. Kaya, and N. Pala "Fractal aluminum Cayley-trees to design plasmonic ultraviolet photodetectors", Proc. SPIE 9836, Micro- and Nanotechnology Sensors, Systems, and Applications VIII, 98362Y (25 May 2016); https://doi.org/10.1117/12.2224333

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