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Terahertz emission by diffusion of carriers and metal-mask dipole inhibition of radiation

Terahertz emission by diffusion of carriers and metal-mask dipole inhibition of radiation
Terahertz emission by diffusion of carriers and metal-mask dipole inhibition of radiation
Terahertz (THz) radiation can be generated by ultrafast photo-excitation of carriers in a semiconductor partly masked by a gold surface. A simulation of the effect taking into account the diffusion of carriers and the electric field shows that the total net current is approximately zero and cannot account for the THz radiation. Finite element modelling and analytic calculations indicate that the THz emission arises because the metal inhibits the radiation from part of the dipole population, thus creating an asymmetry and therefore a net current. Experimental investigations confirm the simulations and show that metal-mask dipole inhibition can be used to create THz emitters.
1094-4087
8898-8906
Barnes, M.E.
02cc9817-23c5-4ddb-855b-1ca14818e67d
McBryde, D.
112ee464-9d3c-410d-b789-6a883417f221
Daniell, G.J.
82c59eea-5002-4889-8823-2c6e5b3288d3
Whitworth, G.
7f515d9b-6515-43cd-b3df-5a4a32f4539a
Chung, A.L.
7112496f-1459-4e30-938a-f36ea2b135b6
Quarterman, A.H.
337f5bd1-5420-45fb-a7e1-f3955c1bfe62
Wilcox, K.G.
b7c8da76-3530-4cbf-aaec-ffa11c347230
Brewer, A.
04aea7ed-1892-4302-bbcc-abbd26d5afde
Beere, H.E.
4068dbab-16c4-444e-8c9c-d56f71da5c50
Ritchie, D.A.
83562b7e-0986-4822-9cfe-8c4ac95596c7
Apostolopoulos, V.
8a898740-4c71-4040-a577-9b9d70530b4d
Barnes, M.E.
02cc9817-23c5-4ddb-855b-1ca14818e67d
McBryde, D.
112ee464-9d3c-410d-b789-6a883417f221
Daniell, G.J.
82c59eea-5002-4889-8823-2c6e5b3288d3
Whitworth, G.
7f515d9b-6515-43cd-b3df-5a4a32f4539a
Chung, A.L.
7112496f-1459-4e30-938a-f36ea2b135b6
Quarterman, A.H.
337f5bd1-5420-45fb-a7e1-f3955c1bfe62
Wilcox, K.G.
b7c8da76-3530-4cbf-aaec-ffa11c347230
Brewer, A.
04aea7ed-1892-4302-bbcc-abbd26d5afde
Beere, H.E.
4068dbab-16c4-444e-8c9c-d56f71da5c50
Ritchie, D.A.
83562b7e-0986-4822-9cfe-8c4ac95596c7
Apostolopoulos, V.
8a898740-4c71-4040-a577-9b9d70530b4d

Barnes, M.E., McBryde, D., Daniell, G.J., Whitworth, G., Chung, A.L., Quarterman, A.H., Wilcox, K.G., Brewer, A., Beere, H.E., Ritchie, D.A. and Apostolopoulos, V. (2012) Terahertz emission by diffusion of carriers and metal-mask dipole inhibition of radiation. Optics Express, 20 (8), 8898-8906. (doi:10.1364/OE.20.008898).

Record type: Article

Abstract

Terahertz (THz) radiation can be generated by ultrafast photo-excitation of carriers in a semiconductor partly masked by a gold surface. A simulation of the effect taking into account the diffusion of carriers and the electric field shows that the total net current is approximately zero and cannot account for the THz radiation. Finite element modelling and analytic calculations indicate that the THz emission arises because the metal inhibits the radiation from part of the dipole population, thus creating an asymmetry and therefore a net current. Experimental investigations confirm the simulations and show that metal-mask dipole inhibition can be used to create THz emitters.

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More information

e-pub ahead of print date: 2 April 2012
Published date: 9 April 2012
Organisations: Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 356135
URI: https://eprints.soton.ac.uk/id/eprint/356135
ISSN: 1094-4087
PURE UUID: e3d84865-cfc3-4d5b-ad20-cd2320259ef6

Catalogue record

Date deposited: 11 Sep 2013 09:11
Last modified: 18 Jul 2017 03:40

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