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Nat Mater. 2017 Feb;16(2):204-207. doi: 10.1038/nmat4755. Epub 2016 Sep 19.

Thermoelectric detection and imaging of propagating graphene plasmons.

Author information

1
ICFO-Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain.
2
Department of Mechanical Engineering, Columbia University, New York, New York 10027, USA.
3
CIC nanoGUNE, E-20018 Donostia-San Sebastián, Spain.
4
National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
5
CIC nanoGUNE and UPV/EHU, E-20018 Donostia-San Sebastián, Spain.
6
IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain.
7
ICREA-Institució Catalana de Recerça i Estudis Avancats, Barcelona 08010, Spain.

Abstract

Controlling, detecting and generating propagating plasmons by all-electrical means is at the heart of on-chip nano-optical processing. Graphene carries long-lived plasmons that are extremely confined and controllable by electrostatic fields; however, electrical detection of propagating plasmons in graphene has not yet been realized. Here, we present an all-graphene mid-infrared plasmon detector operating at room temperature, where a single graphene sheet serves simultaneously as the plasmonic medium and detector. Rather than achieving detection via added optoelectronic materials, as is typically done in other plasmonic systems, our device converts the natural decay product of the plasmon-electronic heat-directly into a voltage through the thermoelectric effect. We employ two local gates to fully tune the thermoelectric and plasmonic behaviour of the graphene. High-resolution real-space photocurrent maps are used to investigate the plasmon propagation and interference, decay, thermal diffusion, and thermoelectric generation.

PMID:
27643730
DOI:
10.1038/nmat4755
[Indexed for MEDLINE]

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