Abstract
| Language | English |
|---|---|
| Article number | 026803 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 98 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 10 Jan 2007 |
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Keywords
- optical-rectification
- photoconduction
- electromagnetic pulses
- acceleration
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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 journal › Article
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 -