Ultrafast Interferometric Studies of Multiple Scattering of Light in Photonic Structures

Liau, Yish-Hann; Scherer, Norbert F.

doi:10.1007/978-3-642-56546-5_119

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“…17 Recently, the propagating mode and the associated dispersion relation were shown to be strongly but controllably altered by periodic modulation of the interfacial dielectric properties. 18 Furthermore, the direct correlation of mesoscopic topographic features with SP-induced reactivity and nanometer-localized electron dynamics has been achieved in ultrafast scanning tunneling microscopy experiments. 19 Knowledge of the dynamics of electron relaxation is essential for elucidating the unique properties of the metallic states of materials.…”

Section: Introductionmentioning

confidence: 99%

“…Ultrafast laser systems can now routinely generate 20 fs laser pulses and have been employed to study the electron dynamics of metallic systems. 14,[17][18][19][25][26][27][28][29][30][31][32][33] The temporal resolution of intensity autocorrelation-based measurements is limited by the width of the autocorrelation function. Because of the extremely short time scale associated with the electronic dephasing, it is often assumed that the electron Fermi sea reaches thermal equilibrium within the (pump) pulse duration.…”

Section: Introductionmentioning

confidence: 99%

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Ultrafast Dephasing of Single Nanoparticles Studied by Two-Pulse Second-Order Interferometry

et al. 2001

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Two-pulse second-order interferometric autocorrelation responses of single Ag nanoparticles are reported. The surface plasmon-enhanced second harmonic generation interferogram for single Ag colloids shows significant broadening with respect to the laser pulse second-order autocorrelation. The interferometric autocorrelation response is described and analyzed with a density matrix formalism that incorporates (phenomenologically) the population and the polarization relaxation of the surface plasmon. The total dephasing time (T 2 ) of the surface plasmon in single Ag colloids is determined to be 10 fs. The present results are compared to previously reported values obtained from ensemble studies of Ag particles and from the line width of the absorption spectrum. Extension of the present ultrafast measurements, the first performed on single nanoparticles, to single molecules studies is discussed.

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Section: Introductionmentioning

confidence: 99%