Transient reflectance of gold was measured using ultrafast spectroscopy by varying the wavelength of the probe laser beam in the visible range. Based on the band structure of gold, the influence of the probe beam wavelength on the signal trend is analyzed in terms of sensitivity, effect of nonthermalized electrons, and relaxation rate. It is found that probing around 490 nm renders the best sensitivity and a simple linear relation between the transient reflectance and the electron temperature. The two-temperature model (TTM) is applied to calculate the electron-phonon coupling factor by fitting the transient reflectance signal. This work clarifies the ultrafast energy transfer dynamics in gold and the importance of using proper probe laser wavelength for modeling the transient heat transfer process in metal.
Issue Section:
Micro/Nanoscale Heat Transfer
Topics:
Electrons,
Phonons,
Reflectance,
Transients (Dynamics),
Signals,
Excitation,
Spectroscopy,
Probes,
Wavelength
References
References
1.
Kaganov
, M. I.
,
Lifshitz
, I. M.
, and
Tanatarov
, L. V.
, 1957
, “Relaxation Between Electrons and the Crystalline Lattice
,” Sov. Phys. JETP
, 4
(2
), pp. 173
–178
.2.
Anisimov.
, S. I.
,
Kapeliovich
, B. L.
, and
Perel'man
, T. L.
, 1974
, “Electron Emission From Metal Surfaces Exposed to Ultrashort Laser Pulses
,” Sov. Phys. JETP
, 39
(2
), pp. 375
–377
.3.
Qiu
, T. Q.
, and
Tien
, C. L.
, 1993
, “Heat Transfer Mechanisms During Short-Pulse Laser Heating of Metals
,” ASME J. Heat Transfer
, 115
(4
), pp. 835
–841
.10.1115/1.2911377
4.
Guo
, L.
,
Hodson
, S. L.
,
Fisher
, T. S.
, and
Xu
, X.
, 2012
, “Heat Transfer Across Metal-Dielectric Interfaces During Ultrafast-Laser Heating
,” ASME J. Heat Transfer
, 134
(4
), p. 042402
.10.1115/1.4005255
5.
Hopkins
, P. E.
,
Duda
, J. C.
,
Kaehr
, B.
,
Zhou
, X. W.
,
Yang
, C.-Y. P.
, and
Jones
, R. E.
, 2013
, “Ultrafast and Steady-State Laser Heating Effects on Electron Relaxation and Phonon Coupling Mechanisms in Thin Gold Films
,” Appl. Phys. Lett.
, 103
(21
), p. 211910
.10.1063/1.4833415
6.
Chen
, J. K.
,
Latham
, W. P.
, and
Beraun
, J. E.
, 2005
, “The Role of Electron–Phonon Coupling in Ultrafast Laser Heating
,” J. Laser Appl.
, 17
(1
), pp. 63
–68
.10.2351/1.1848522
7.
Hostetler
, J. L.
,
Smith
, A. N.
,
Czajkowsky
, D. M.
, and
Norris
, P. M.
, 1999
, “Measurement of the Electron-Phonon Coupling Factor Dependence on Film Thickness and Grain Size in Au, Cr, and Al
,” Appl. Opt.
, 38
(16
), pp. 3614
–3620
.10.1364/AO.38.003614
8.
Hohlfeld
, J.
,
Wellershoff
, S.-S.
,
Gudde
, J.
,
Conrad
, U.
,
Jahnke
, V.
, and
Matthias
, E.
, 2000
, “Electron and Lattice Dynamics Following Optical Excitation of Metals
,” Chem. Phys.
, 251
(1–3
), pp. 237
–258
.10.1016/S0301-0104(99)00330-4
9.
Smith
, A. N.
, and
Norris
, P. M.
, 2001
, “Influence of Intraband Transitions on the Electron Thermoreflectance Response of Metals
,” Appl. Phys. Lett.
, 78
(9
), pp. 1240
–1242
.10.1063/1.1351523
10.
Sun
, C.-K.
,
Vallee
, F.
,
Acioli
, L. H.
,
Ippen
, E. P.
, and
Fujimoto
, J. G.
, 1994
, “Femtosecond-Tunable Measurement of Electron Thermalization in Gold
,” Phys. Rev. B
, 50
(20
), pp. 15337
–15348
.10.1103/PhysRevB.50.15337
11.
Fann
, W. S.
,
Storz
, R.
,
Tom
, H. W. K.
, and
Bokor
, J.
, 1992
, “Direct Measurement of Nonequilibrium Electron-Energy Distributions in Subpicosecond Laser-Heated Gold Films
,” Phys. Rev. Lett.
, 68
(18
), pp. 2834
–2837
.10.1103/PhysRevLett.68.2834
12.
Groeneveld
, R. H. M.
,
Sprik
, R.
, and
Lagendijk
, A.
, 1992
, “Effect of a Nonthermal Electron Distribution on the Electron-Phonon Energy Relaxation Process in Noble Metals
,” Phys. Rev. B
, 45
(9
), pp. 5079
–5082
.10.1103/PhysRevB.45.5079
13.
Fann
, W. S.
,
Storz
, R.
,
Tom
, H. W. K.
, and
Bokor
, J.
, 1992
, “Electron Thermalization of Gold
,” Phys. Rev. B
, 46
(20
), pp. 13592
–13595
.10.1103/PhysRevB.46.13592
14.
Hopkins
, P. E.
,
Phinney
, L. M.
, and
Serrano
, J. R.
, 2011
, “Re-examining Electron-Fermi Relaxation in Gold Films With a Nonlinear Thermoreflectance Model
,” ASME J. Heat Transfer
, 133
(4
), p. 044505
.10.1115/1.4002778
15.
Hopkins
, P. E.
,
Kassebaum
, J. L.
, and
Norris
, P. M.
, 2009
, “Effects of Electron Scattering at Metal–Nonmetal Interfaces on Electron-Phonon Equilibration in Gold Films
,” J. Appl. Phys.
, 105
(2
), p. 023710
.10.1063/1.3068476
16.
Lundstrom
, M.
, 2000
, Fundamentals of Carrier Transport
, Cambridge University
, Cambridge, UK
.17.
Chowdhury
, I. H.
, and
Xu
, X.
, 2003
, “Heat Transfer in Femtosecond Laser Processing of Metal
,” Numer. Heat Transfer, Part A
, 44
(3
), pp. 219
–232
.10.1080/716100504
18.
Brorson
, S. D.
,
Kazeroonian
, A.
,
Moodera
, J. S.
,
Face
, D. W.
,
Cheng
, T. K.
,
Ippen
, E. P.
,
Dresselhaus
, M. S.
, and
Dresselhaus
, G.
, 1990
, “Femtosecond Room-Temperature Measurement of the Electron-Phonon Coupling Constant λ in Metallic Superconductors
,” Phys. Rev. Lett.
, 64
(18
), pp. 2172
–2175
.10.1103/PhysRevLett.64.2172
19.
Elsayed-Ali
, H. E.
,
Juhasz
, T.
,
Smith
, G. O.
, and
Bron
, W. E.
, 1991
, “Femtosecond Thermoreflectivity and Thermotransmissivity of Polycrystalline and Single-Crystalline Gold Films
,” Phys. Rev. B
, 43
(5
), pp. 4488
–4491
.10.1103/PhysRevB.43.4488
20.
Choi
, G.-M.
,
Wilson
, R. B.
, and
Cahill
, D. G.
, 2014
, “Indirect Heating of Pt by Short-Pulse Laser Irradiation of Au in a Nanoscale Pt/Au Bilayer
,” Phys. Rev. B
, 89
(6
), p. 064307
.10.1103/PhysRevB.89.064307
21.
Ehrenreich
, H.
, and
Phillip
, H. R.
, 1962
, “Optical Properties of Ag and Cu
,” Phys. Rev.
, 128
(4
), pp. 1622
–1629
.10.1103/PhysRev.128.1622
22.
Eesley
, G. L.
, 1983
, “Observation of Nonequilibrium Electron Heating in Copper
,” Phys. Rev. Lett.
, 51
(23
), pp. 2140
–2143
.10.1103/PhysRevLett.51.2140
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