Ultrafast laser pulse chirp effects on laser-generated nanoacoustic strains in Silicon

被引：5

作者：

Bakarezos, M. ^{[1
,2
]}

Tzianaki, E. ^{[3
]}

Petrakis, S. ^{[1
]}

Tsibidis, G. ^{[4
]}

Loukakos, P. A. ^{[4
]}

Dimitriou, V. ^{[1
]}

Kosmidis, C. ^{[3
]}

Tatarakis, M. ^{[1
]}

Papadogiannis, N. A. ^{[1
,2
]}

机构：

[1] Technol Educ Inst Crete, Ctr Plasma Phys & Lasers, Sch Appl Sci, Tria Monastiria 74100, Rethymno, Greece

[2] Technol Educ Inst Crete, Sch Appl Sci, Dept Mus Technol & Acoust Engn, 1 E Daskalaki Str, Rethimnon 74133, Greece

[3] Univ Ioannina, Sch Sci, Phys Dept, GR-45110 Ioannina, Greece

[4] Inst Elect Struct & Laser, Fdn Res & Technol Hellas FORTH, N Plastira 100, Iraklion 70013, Greece

来源：

ULTRASONICS | 2018年 / 86卷

关键词：

Picosecond ultrasonics; Ultrafast acoustics; Laser ultrasonics; Nanoacoustic strains; Laser pulse chirp; Silicon; ULTRATHIN GOLD-FILMS; PICOSECOND ULTRASONICS; ELECTRON THERMALIZATION; PHONON ATTENUATION; VIBRATIONAL-MODES; DYNAMICS; SURFACE; METALS; THIN; SPECTROSCOPY;

D O I：

10.1016/j.ultras.2018.01.008

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

Nanoacoustic strains are generated in Silicon by chirped femtosecond laser pulses using thin Titanium films as transducers. We investigate the effect that the generating laser pulse chirp has on the amplitude of the induced strains, manifested as Brillouin oscillations observed in degenerate femtosecond pumpprobe transient reflectivity measurements. The strain amplitude is larger when negatively chirped pulses are used, which is attributed to the more efficient conversion of laser pulse light into acoustic strain in the Titanium transducer. Our present studies clearly show that the dependence of the Brillouin amplitude and the lattice strain is a non-monotonous function of the laser chirp parameter. An optimum negative laser pulse chirp is found for which the strain amplitude is maximized. A detailed thermomechanical model satisfactorily supports the experimental findings. In such a way, it is possible to suppress or enhance the induced nanoacoustic strain amplitude, thus all-optically controlling it by at least a factor of two. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：14 / 19

页数：6

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