Terahertz-pulse emission through laser excitation of surface plasmons in a metal grating

G.H. Welsh, N.T. Hunt, K. Wynne

Research output: Contribution to journalArticle

96 Citations (Scopus)

Abstract

The second-order processes of optical-rectification and photoconduction are well known and widely used to produce ultrafast electromagnetic pulses in the terahertz frequency domain. We present a new form of rectification that relies on the excitation of surface plasmons in metal films deposited on a shallow grating. Multiphoton ionization and ponderomotive acceleration of electrons in the enhanced evanescent field of the surface plasmons results in a femtosecond current surge and emission of terahertz electromagnetic radiation. Using gold, this rectification process is third or higher-order in the incident field.
LanguageEnglish
Article number026803
Number of pages4
JournalPhysical Review Letters
Volume98
Issue number2
DOIs
Publication statusPublished - 10 Jan 2007

Fingerprint

rectification
plasmons
gratings
pulses
metals
excitation
lasers
electromagnetic pulses
metal films
electromagnetic radiation
gold
ionization
electrons

Keywords

  • optical-rectification
  • photoconduction
  • electromagnetic pulses
  • acceleration

Cite this

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title = "Terahertz-pulse emission through laser excitation of surface plasmons in a metal grating",
abstract = "The second-order processes of optical-rectification and photoconduction are well known and widely used to produce ultrafast electromagnetic pulses in the terahertz frequency domain. We present a new form of rectification that relies on the excitation of surface plasmons in metal films deposited on a shallow grating. Multiphoton ionization and ponderomotive acceleration of electrons in the enhanced evanescent field of the surface plasmons results in a femtosecond current surge and emission of terahertz electromagnetic radiation. Using gold, this rectification process is third or higher-order in the incident field.",
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Terahertz-pulse emission through laser excitation of surface plasmons in a metal grating. / Welsh, G.H.; Hunt, N.T.; Wynne, K.

In: Physical Review Letters, Vol. 98, No. 2, 026803, 10.01.2007.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Terahertz-pulse emission through laser excitation of surface plasmons in a metal grating

AU - Welsh, G.H.

AU - Hunt, N.T.

AU - Wynne, K.

PY - 2007/1/10

Y1 - 2007/1/10

N2 - The second-order processes of optical-rectification and photoconduction are well known and widely used to produce ultrafast electromagnetic pulses in the terahertz frequency domain. We present a new form of rectification that relies on the excitation of surface plasmons in metal films deposited on a shallow grating. Multiphoton ionization and ponderomotive acceleration of electrons in the enhanced evanescent field of the surface plasmons results in a femtosecond current surge and emission of terahertz electromagnetic radiation. Using gold, this rectification process is third or higher-order in the incident field.

AB - The second-order processes of optical-rectification and photoconduction are well known and widely used to produce ultrafast electromagnetic pulses in the terahertz frequency domain. We present a new form of rectification that relies on the excitation of surface plasmons in metal films deposited on a shallow grating. Multiphoton ionization and ponderomotive acceleration of electrons in the enhanced evanescent field of the surface plasmons results in a femtosecond current surge and emission of terahertz electromagnetic radiation. Using gold, this rectification process is third or higher-order in the incident field.

KW - optical-rectification

KW - photoconduction

KW - electromagnetic pulses

KW - acceleration

U2 - 10.1103/PhysRevLett.98.026803

DO - 10.1103/PhysRevLett.98.026803

M3 - Article

VL - 98

JO - Physical Review Letters

T2 - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 2

M1 - 026803

ER -