The University of Southampton
University of Southampton Institutional Repository

Plasmonic amplification of free-electron evanescent fields

Plasmonic amplification of free-electron evanescent fields
Plasmonic amplification of free-electron evanescent fields
We show experimentally for the first time that free-electron evanescent fields can be amplified by a plasmonic nanolayer in a manner analogous to the way in which optical fields are amplified in the poor-man's superlens.

The manipulation of evanescent electromagnetic fields has been a key motivation in the field of plasmonics. However, one class of evanescent field has been excluded from consideration here - the evanescent field of moving free electrons. The electromagnetic energy of free electrons exists in the form of evanescent waves and it can be out-coupled to light only when the electrons are in close proximity to a 'slow-wave medium' or optical inhomogeneity. The former causes the well-known phenomenon of Cerenkov radiation, the latter diffraction or Smith-Purcell radiation. Here, in analogy to the 'poor-man's superlens', wherein the evanescent component of light from an object is restored by a thin silver layer to beat the diffraction limit, we demonstrate the use of an intermediate silver layer to amplify the free-electron evanescent field before it is out-coupled into light by a nano-grating. The presence of a silver layer provides for the excitation of phase-velocity matched surface plasmons, and leads to the amplification of the electrons' evanescent field.
So, J.-K.
06a7afea-61c2-439d-9ac4-047ea21a909b
Ou, J.Y.
3fb703e3-b222-46d2-b4ee-75f296d9d64d
Adamo, G.
a614528b-81c3-4f38-a709-5e582b03e7d2
García de Abajo, F.J.
68958b41-966f-49ef-9578-d0ffa446b33e
MacDonald, K.F.
76c84116-aad1-4973-b917-7ca63935dba5
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
So, J.-K.
06a7afea-61c2-439d-9ac4-047ea21a909b
Ou, J.Y.
3fb703e3-b222-46d2-b4ee-75f296d9d64d
Adamo, G.
a614528b-81c3-4f38-a709-5e582b03e7d2
García de Abajo, F.J.
68958b41-966f-49ef-9578-d0ffa446b33e
MacDonald, K.F.
76c84116-aad1-4973-b917-7ca63935dba5
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6

So, J.-K., Ou, J.Y., Adamo, G., García de Abajo, F.J., MacDonald, K.F. and Zheludev, N.I. (2013) Plasmonic amplification of free-electron evanescent fields. IPS Meeting 2013, Singapore. 04 - 06 Mar 2013.

Record type: Conference or Workshop Item (Other)

Abstract

We show experimentally for the first time that free-electron evanescent fields can be amplified by a plasmonic nanolayer in a manner analogous to the way in which optical fields are amplified in the poor-man's superlens.

The manipulation of evanescent electromagnetic fields has been a key motivation in the field of plasmonics. However, one class of evanescent field has been excluded from consideration here - the evanescent field of moving free electrons. The electromagnetic energy of free electrons exists in the form of evanescent waves and it can be out-coupled to light only when the electrons are in close proximity to a 'slow-wave medium' or optical inhomogeneity. The former causes the well-known phenomenon of Cerenkov radiation, the latter diffraction or Smith-Purcell radiation. Here, in analogy to the 'poor-man's superlens', wherein the evanescent component of light from an object is restored by a thin silver layer to beat the diffraction limit, we demonstrate the use of an intermediate silver layer to amplify the free-electron evanescent field before it is out-coupled into light by a nano-grating. The presence of a silver layer provides for the excitation of phase-velocity matched surface plasmons, and leads to the amplification of the electrons' evanescent field.

Full text not available from this repository.

More information

e-pub ahead of print date: 2013
Venue - Dates: IPS Meeting 2013, Singapore, 2013-03-04 - 2013-03-06
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 366513
URI: https://eprints.soton.ac.uk/id/eprint/366513
PURE UUID: 923dc64c-d544-4623-baa8-6a882842445d
ORCID for J.Y. Ou: ORCID iD orcid.org/0000-0001-8028-6130
ORCID for K.F. MacDonald: ORCID iD orcid.org/0000-0002-3877-2976
ORCID for N.I. Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

Catalogue record

Date deposited: 01 Jul 2014 11:29
Last modified: 20 Jul 2019 01:22

Export record

Contributors

Author: J.-K. So
Author: J.Y. Ou ORCID iD
Author: G. Adamo
Author: F.J. García de Abajo
Author: K.F. MacDonald ORCID iD
Author: N.I. Zheludev ORCID iD

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×