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Extremely High Near Field Enhancement in a Novel Plasmonic Nano Material used for Photovoltage Generation

Paria, Debadrita and Roy, Kallol and Kumar, Shishir and Singh, Haobijam Johnson and Raghavan, Srinivasan and Ghosh, Arindam and Ghosh, Ambarish (2015) Extremely High Near Field Enhancement in a Novel Plasmonic Nano Material used for Photovoltage Generation. In: Conference on Photonic and Phononic Properties of Engineered Nanostructures V, FEB 09-12, 2015, San Francisco, CA.

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Official URL: http://dx.doi.org/10.1117/12.2078859

Abstract

Enhancement of localized electric field near metal (plasmonic) nanostructures can have various interesting applications in sensing, imaging, photovoltage generation etc., for which significant efforts are aimed towards developing plasmonic systems with well designed and large electromagnetic response. In this paper, we discuss the wafer scale fabrication and optical characterization of a unique three dimensional plasmonic material. The near field enhancement in the visible range of the electromagnetic spectrum obtained in these structures (order of 106), is close to the fundamental limit that can be obtained in this and similar EM field enhancement schemes. The large near field enhancement has been reflected in a huge Raman signal of graphene layer in close proximity to the plasmonic system, which has been validated with FEM simulations. We have integrated graphene photodetectors with this material to obtain record photovoltage generation, with responsivity as high as A/W. As far as we know, this is the highest sensitivity obtained in any plasmonic-graphene hybrid photodetection system till date.

Item Type: Conference Proceedings
Additional Information: Copy right for this article belongs to the SPIE-INT SOC OPTICAL ENGINEERING, 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
Keywords: Plasmonics; Near field; Graphene; Raman spectroscopy; FEM Simulation; photovoltage; SERS; Glancing Angle Deposition
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Electrical Sciences > Electrical Communication Engineering
Division of Interdisciplinary Research > Centre for Nano Science and Engineering
Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 29 May 2015 06:41
Last Modified: 29 May 2015 06:41
URI: http://eprints.iisc.ac.in/id/eprint/51620

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