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Unconventional plasmonic sensitization of graphene in mid-infrared

Paria, D and Vadakkumbatt, V and Ravindra, P and Avasthi, S and Ghosh, A (2021) Unconventional plasmonic sensitization of graphene in mid-infrared. In: Nanotechnology, 32 (31).

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Official URL: https://doi.org/10.1088/1361-6528/abf96c


Light-matter interaction in graphene can be engineered and substantially enhanced through plasmonic sensitization, which has led to numerous applications in photodetection, sensing, photocatalysis and spectroscopy. The majority of these designs have relied on conventional plasmonic materials such as gold, silver and aluminum. This limits the implementation of such devices to the ultraviolet and visible regimes of the electromagnetic spectrum. However, for many practical applications, including those relevant to security and defense, the development of new strategies and materials for sensing and detection of infra red (IR) light is crucial. Here we use surface enhanced Raman spectroscopy (SERS), for direct visualization and estimation of enhanced light-matter interaction in graphene in the mid-IR regime, through sensitization by an unconventional plasmonic material. Specifically, we fabricate a hybrid device consisting of a single layer graphene and a two-dimensional array of nanodiscs of aluminum doped zinc oxide (AZO), which is a highly doped semiconductor, exhibiting plasmonic resonance in the mid-IR. We find that the enhancement in the SERS signal of graphene is of similar magnitude to what has been achieved previously in the visible using conventional plasmonic materials. Our results establish the potential of such hybrid systems for graphene-based optical and optoelectronic applications in the mid-IR. © 2021 IOP Publishing Ltd.

Item Type: Journal Article
Publication: Nanotechnology
Publisher: IOP Publishing Ltd
Additional Information: The copyright for this article belongs to IOP Publishing Ltd
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 05 Aug 2021 06:30
Last Modified: 05 Aug 2021 06:30
URI: http://eprints.iisc.ac.in/id/eprint/69051

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