The third-order nonlinear optical susceptibility of gold

被引:190
作者
Boyd, Robert W. [1 ,2 ,3 ,4 ,5 ]
Shi, Zhimin [6 ]
De Leon, Israel [3 ,4 ]
机构
[1] Univ Rochester, Inst Opt, Rochester, NY 14627 USA
[2] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA
[3] Univ Ottawa, Dept Phys, Ottawa, ON K1N 6N5, Canada
[4] Univ Ottawa, Sch Elect Engn & Comp Sci, Ottawa, ON K1N 6N5, Canada
[5] Univ Glasgow, Dept Phys & Astron, SUPA, Glasgow, Lanark, Scotland
[6] Univ S Florida, Dept Phys, Tampa, FL 33620 USA
关键词
Nonlinear optics; Gold; Plasmonics; Third-order nonlinear susceptibility; COMPOSITE-MATERIALS; ABSORPTION; FILM;
D O I
10.1016/j.optcom.2014.03.005
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We critically analyze reported measured values of the third-order nonlinear optical susceptibility chi((3)) of bulk gold. Reported values of this quantity span a range of more than three orders of magnitude. Much of this variation results from the use of different measurement procedures which are sensitive to different contributions to the nonlinear optical response. For example, values measured through use of third-harmonic generation or non-degenerate four-wave mixing tend to be significantly lower than those obtained from measurements of the intensity-dependent refractive index. We ascribe this behavior to the fact that the first two processes respond only to "instantaneous" nonlinearities, whereas the nonlinear refractive index has a contribution from the much stronger but much slower "hot electron," or "Fermi-smearing" mechanism, which has a response time of the order of picoseconds. The data also reveal that the hot-electron contribution has a strong dependence on laser wavelength, because of the turn-on of the 5d to 6sp transition at about 550 nm It is hoped that the compilation presented here will prove useful in establishing what value of chi((3)) is most appropriate for adoption under various laboratory conditions. (C) 2014 Published by Elsevier B.V.
引用
收藏
页码:74 / 79
页数:6
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