Extremely high near field enhancement in a novel plasmonic nano material used for photovoltage generation

Debadrita Paria; Kallol Roy; Shishir Kumar; Haobijam Johnson Singh; Srinivasan Raghavan; Arindam Ghosh; Ambarish Ghosh

doi:10.1117/12.2078859

27 February 2015 Extremely high near field enhancement in a novel plasmonic nano material used for photovoltage generation

Debadrita Paria, Kallol Roy, Shishir Kumar, Haobijam Johnson Singh, Srinivasan Raghavan, Arindam Ghosh, Ambarish Ghosh

Author Affiliations +

Proceedings Volume 9371, Photonic and Phononic Properties of Engineered Nanostructures V; 93711G (2015) https://doi.org/10.1117/12.2078859
Event: SPIE OPTO, 2015, San Francisco, California, United States

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.

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Debadrita Paria, Kallol Roy, Shishir Kumar, Haobijam Johnson Singh, Srinivasan Raghavan, Arindam Ghosh, and Ambarish Ghosh "Extremely high near field enhancement in a novel plasmonic nano material used for photovoltage generation", Proc. SPIE 9371, Photonic and Phononic Properties of Engineered Nanostructures V, 93711G (27 February 2015); https://doi.org/10.1117/12.2078859

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KEYWORDS

Graphene

Plasmonics

Silver

Nanoparticles

Near field

Scanning electron microscopy

Semiconducting wafers

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