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Proceedings Paper

Compact graphene plasmonic slot photodetector on silicon-on-insulator with high responsivity (Conference Presentation)
Author(s): Zhizhen Ma; Kazuya Kikunage; Hao Wang; Shuai Sun; Rubab Amin; Mario Miscuglio; Hamed Dalir; Volker Sorger

Paper Abstract

Graphene has extraordinary electro-optic properties and is therefore a promising candidate for monolithic photonic devices such as photodetectors. However, the integration of this atom-thin layer material with bulky photonic components usually results in a weak light-graphene interaction leading to large device lengths limiting electro-optic performance. In contrast, here we demonstrate a plasmonic slot graphene photodetector on silicon-on-insulator platform with high-responsivity given the 5 µm-short device length. We observe that the maximum photocurrent, and hence the highest responsivity, scales inversely with the slot width. Using a dual-lithography step, we realize 15 nm narrow slots that show a 15-times higher responsivity per unit device-length compared to photonic graphene photodetectors. Furthermore, we reveal that the back-gated electrostatics is overshadowed by channel-doping contributions induced by the contacts of this ultra-short channel graphene photodetector. This leads to quasi charge neutrality, which explains both the previously-unseen offset between the maximum photovoltaic-based photocurrent relative to graphene’s Dirac point and the observed non-ambipolar transport. Such micrometer compact and absorption-efficient photodetectors allow for short-carrier pathways in next-generation photonic components, while being an ideal testbed to study short-channel carrier physics in graphene optoelectronics.

Paper Details

Date Published: 8 March 2019
Proc. SPIE 10927, Photonic and Phononic Properties of Engineered Nanostructures IX, 109270V (8 March 2019); doi: 10.1117/12.2524228
Show Author Affiliations
Zhizhen Ma, The George Washington University (United States)
Kazuya Kikunage, The George Washington Univ. (United States)
Hao Wang, The George Washington University (United States)
Shuai Sun, The George Washington University (United States)
Rubab Amin, The George Washington University (United States)
Mario Miscuglio, The George Washington University (United States)
Hamed Dalir, Omega Optics (United States)
Volker Sorger, The George Washington University (United States)

Published in SPIE Proceedings Vol. 10927:
Photonic and Phononic Properties of Engineered Nanostructures IX
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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