Ultraconfined Plasmonic Hotspots Inside Graphene Nanobubbles

Z. Fei; J. J. Foley; W. Gannett; M. K. Liu; S. Dai; G. X. Ni; A. Zettl; M. M. Fogler; G. P. Wiederrecht; S. K. Gray; D. N. Basov

doi:10.1021/acs.nanolett.6b04076

Ultraconfined Plasmonic Hotspots Inside Graphene Nanobubbles

Z. Fei
, J. J. Foley
, W. Gannett
, M. K. Liu
, S. Dai
, G. X. Ni
, A. Zettl
, M. M. Fogler
, G. P. Wiederrecht
, S. K. Gray
, D. N. Basov

Physics and Astronomy

University of California at San Diego
Argonne National Laboratory
Iowa State University
William Paterson University
University of California at Berkeley
Lawrence Berkeley National Laboratory
Columbia University

Research output: Contribution to journal › Article › peer-review

45 Scopus citations

Abstract

We report on a nanoinfrared (IR) imaging study of ultraconfined plasmonic hotspots inside graphene nanobubbles formed in graphene/hexagonal boron nitride (hBN) heterostructures. The volume of these plasmonic hotspots is more than one-million-times smaller than what could be achieved by free-space IR photons, and their real-space distributions are controlled by the sizes and shapes of the nanobubbles. Theoretical analysis indicates that the observed plasmonic hotspots are formed due to a significant increase of the local plasmon wavelength in the nanobubble regions. Such an increase is attributed to the high sensitivity of graphene plasmons to its dielectric environment. Our work presents a novel scheme for plasmonic hotspot formation and sheds light on future applications of graphene nanobubbles for plasmon-enhanced IR spectroscopy.

Original language	English
Pages (from-to)	7842-7848
Number of pages	7
Journal	Nano Letters
Volume	16
Issue number	12
DOIs	https://doi.org/10.1021/acs.nanolett.6b04076
State	Published - Dec 14 2016

Keywords

FDTD simulation
Graphene nanobubbles
heterostructures
nanoinfrared imaging
plasmon hotspots

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10.1021/acs.nanolett.6b04076

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title = "Ultraconfined Plasmonic Hotspots Inside Graphene Nanobubbles",

abstract = "We report on a nanoinfrared (IR) imaging study of ultraconfined plasmonic hotspots inside graphene nanobubbles formed in graphene/hexagonal boron nitride (hBN) heterostructures. The volume of these plasmonic hotspots is more than one-million-times smaller than what could be achieved by free-space IR photons, and their real-space distributions are controlled by the sizes and shapes of the nanobubbles. Theoretical analysis indicates that the observed plasmonic hotspots are formed due to a significant increase of the local plasmon wavelength in the nanobubble regions. Such an increase is attributed to the high sensitivity of graphene plasmons to its dielectric environment. Our work presents a novel scheme for plasmonic hotspot formation and sheds light on future applications of graphene nanobubbles for plasmon-enhanced IR spectroscopy.",

keywords = "FDTD simulation, Graphene nanobubbles, heterostructures, nanoinfrared imaging, plasmon hotspots",

author = "Z. Fei and Foley, \{J. J.\} and W. Gannett and Liu, \{M. K.\} and S. Dai and Ni, \{G. X.\} and A. Zettl and Fogler, \{M. M.\} and Wiederrecht, \{G. P.\} and Gray, \{S. K.\} and Basov, \{D. N.\}",

note = "Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

year = "2016",

month = dec,

day = "14",

doi = "10.1021/acs.nanolett.6b04076",

language = "English",

volume = "16",

pages = "7842--7848",

journal = "Nano Letters",

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TY - JOUR

T1 - Ultraconfined Plasmonic Hotspots Inside Graphene Nanobubbles

AU - Fei, Z.

AU - Foley, J. J.

AU - Gannett, W.

AU - Liu, M. K.

AU - Dai, S.

AU - Ni, G. X.

AU - Zettl, A.

AU - Fogler, M. M.

AU - Wiederrecht, G. P.

AU - Gray, S. K.

AU - Basov, D. N.

PY - 2016/12/14

Y1 - 2016/12/14

N2 - We report on a nanoinfrared (IR) imaging study of ultraconfined plasmonic hotspots inside graphene nanobubbles formed in graphene/hexagonal boron nitride (hBN) heterostructures. The volume of these plasmonic hotspots is more than one-million-times smaller than what could be achieved by free-space IR photons, and their real-space distributions are controlled by the sizes and shapes of the nanobubbles. Theoretical analysis indicates that the observed plasmonic hotspots are formed due to a significant increase of the local plasmon wavelength in the nanobubble regions. Such an increase is attributed to the high sensitivity of graphene plasmons to its dielectric environment. Our work presents a novel scheme for plasmonic hotspot formation and sheds light on future applications of graphene nanobubbles for plasmon-enhanced IR spectroscopy.

AB - We report on a nanoinfrared (IR) imaging study of ultraconfined plasmonic hotspots inside graphene nanobubbles formed in graphene/hexagonal boron nitride (hBN) heterostructures. The volume of these plasmonic hotspots is more than one-million-times smaller than what could be achieved by free-space IR photons, and their real-space distributions are controlled by the sizes and shapes of the nanobubbles. Theoretical analysis indicates that the observed plasmonic hotspots are formed due to a significant increase of the local plasmon wavelength in the nanobubble regions. Such an increase is attributed to the high sensitivity of graphene plasmons to its dielectric environment. Our work presents a novel scheme for plasmonic hotspot formation and sheds light on future applications of graphene nanobubbles for plasmon-enhanced IR spectroscopy.

KW - FDTD simulation

KW - Graphene nanobubbles

KW - heterostructures

KW - nanoinfrared imaging

KW - plasmon hotspots

UR - https://www.scopus.com/pages/publications/85006285068

U2 - 10.1021/acs.nanolett.6b04076

DO - 10.1021/acs.nanolett.6b04076

M3 - Article

AN - SCOPUS:85006285068

SN - 1530-6984

VL - 16

SP - 7842

EP - 7848

JO - Nano Letters

JF - Nano Letters

IS - 12

ER -

Ultraconfined Plasmonic Hotspots Inside Graphene Nanobubbles

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Keywords

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