Observation of strongly enhanced ultrashort pulses in 3-D metallic funnel-waveguide.
Opt Express
; 22(14): 17360-9, 2014 Jul 14.
Article
em En
| MEDLINE
| ID: mdl-25090549
ABSTRACT
For strong field enhancement of ultrashort light pulses, a 3-D metallic funnel-waveguide is analyzed using the finite-difference time-domain (FDTD) method. Then the maximum intensity enhancement actually developed by the funnel-waveguide upon the injection of femtosecond laser pulses is observed using two-photon luminescence (TPL) microscopy. In addition, the ultrafast dephasing profile of the localized field at the hot spot of the funnel-waveguide is verified through the interferometric autocorrelation of the TPL signal. Finally it is concluded the funnel-waveguide is an effective 3-D nanostructure that is capable of boosting the peak pulse intensity of stronger than 80 TWcm(-2) by an enhancement factor of 20 dB without significant degradation of the ultrafast spatiotemporal characteristics of the original pulses.
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MEDLINE
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En
Ano de publicação:
2014
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Article