Generation of nonequilibrium electron and lattice temperatures in copper by picosecond laser pulses

Eesley, G. L.

doi:10.1103/physrevb.33.2144

Cited by 357 publications

(163 citation statements)

References 12 publications

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“…4d). The mean value of τ slow = 130 ± 10 ps (for both samples) suggests that ∆T is dominated by heat diffusion rates along the metal stripline 25 .…”

Section: Time-integrated and Time-resolved Photocurrent Spectroscopymentioning

confidence: 99%

Time-resolved ultrafast photocurrents and terahertz generation in freely suspended graphene

et al. 2012

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Graphene, a two-dimensional layer of carbon atoms, is a promising building block for a wide range of optoelectronic devices owing to its extraordinary electrical and optical properties, including the ability to absorb ~2% of incident light over a broad wavelength range. While the RC-limited bandwidth of graphene-based photodetectors can be estimated to be as large as 640 GHz, conventional electronic measurement techniques lack for analysing photocurrents at such frequencies. Here we report on time-resolved picosecond photocurrents in freely suspended graphene contacted by metal electrodes. At the graphene-metal interface, we demonstrate that built-in electric fields give rise to a photocurrent with a full-width-halfmaximum of ~4 ps and that a photothermoelectric effect generates a current with a decay time of ~130 ps. Furthermore, we show that, in optically pumped graphene, electromagnetic radiation up to 1 THz is generated. our results may prove essential to build graphene-based ultrafast photodetectors, photovoltaic cells and terahertz sources.

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“…4d). The mean value of τ slow = 130 ± 10 ps (for both samples) suggests that ∆T is dominated by heat diffusion rates along the metal stripline 25 .…”

Section: Time-integrated and Time-resolved Photocurrent Spectroscopymentioning

confidence: 99%

Time-resolved ultrafast photocurrents and terahertz generation in freely suspended graphene

et al. 2012

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“…This actually means that the imaginary character of (3) inter χ as well as, more generally, the sign and modulus of both electronic contributions, are expected to undergo spectral variations, which is rarely considered in the literature. As soon as the incident wave intensity is sufficiently high, the modification of the conduction electron distribution induced by photon absorption may result in a significant modification of the optical transition spectrum [60,61]. This is the Fermi smearing, which is not a pure electronic nonlinear effect but was demonstrated by Hache and co-workers to amount to an optical Kerr effect contribution [56], that they characterized by the hot electron susceptibility, (3) hot electrons χ .…”

Section: 4mentioning

confidence: 99%

Gold nanoparticle assemblies: interplay between thermal effects and optical response

et al. 2008

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The optical response of materials based on gold nanoparticle assemblies depends on many parameters regarding both material morphology and light excitation characteristics. In this paper, the interplay between the optical and thermal responses of such media is particularly investigated under its theoretical aspect. Both conventional and original modeling approaches are presented and applied to concrete cases. We first show how the interaction of light with matrix-embedded gold nanoparticles can result in the generation of thermal excitations through different energy exchange mechanisms. We then describe how thermal processes can affect the optical response of a nanoparticle assembly. Finally, we connect both aspects and point out their involvement in the nonlinear optical response of nanocomposite media. This allows us to tackle two key issues in the field of third-order nonlinear properties of gold nanoparticles: The influence of the generalized thermal lens in the long laser pulse regime and the hot electron contribution to the gold particle intrinsic third-order susceptibility, including its spectral dispersion and intensity-dependence. Additionally, we demonstrate the possible significant influence of the heat carrier ballistic regime and phonon rarefaction in the cooling dynamics of an embedded gold nanoparticle subsequent to ultrafast pulsed laser excitation.

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“…Only recently have we been able to observe this phenomenon using picosecond pulsed lasers [13,14]. This nonequilibrium heating can be obse!ygd in both semiconductors and metals.…”

Section: Tbermal Transport: Time Domainmentioning

confidence: 99%

“…2. We have used a heating pulsewidth oi 5 psec and a pulse energy oi 0.5 nJ, and during this time we see that the ele~tron temperature does exceed that lattice temperature by a iew degrees [14]. The use of substantially shorter pulses results in a larger electron-lattice temperature mismatch, and the equilibration time exceeds the laser pul sewidth.…”

Section: Tbermal Transport: Time Domainmentioning

confidence: 99%

Picosecond Transient Thermoreflectance: Time-Resolved Studies of Thin Film Thermal Transport

Eesley

1987

Review of Progress in Quantitative Nondestructive Evaluation

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Generation of nonequilibrium electron and lattice temperatures in copper by picosecond laser pulses

Cited by 357 publications

References 12 publications

Time-resolved ultrafast photocurrents and terahertz generation in freely suspended graphene

Time-resolved ultrafast photocurrents and terahertz generation in freely suspended graphene

Gold nanoparticle assemblies: interplay between thermal effects and optical response

Picosecond Transient Thermoreflectance: Time-Resolved Studies of Thin Film Thermal Transport

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