Coherent phonon emission in the supersonic expansion of photoexcited electron-hole plasma in Ge

Chigarev, N. V.; Paraschuk, Dmitry Yu.; Pan, X. Y.; Gusev, Vitalyi

doi:10.1103/physrevb.61.15837

Cited by 40 publications

(32 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Consequently, the characteristic spatial profile of the emitted coherent acoustic phonons contains information on the light-matter energy conversion process. In bulk solids, the analysis of coherent acoustic phonons packet has permitted to understand the evolution in time and in space of the different electron-acoustic phonons interactions like the thermoelastic process (ultrafast heating of the lattice) [13][14][15], the deformation potential process (electronic pressure) [16][17][18] and even, reported recently, the spatial electron-hole separation in semiconductors (i.e. the photoinduced Dember electric field) [19].…”

mentioning

confidence: 99%

Ultrafast acousto-plasmonics in gold nanoparticle superlattices

et al. 2015

Self Cite

View full text Add to dashboard Cite

We report the investigation of the generation and detection of GHz coherent acoustic phonons in plasmonic gold nanoparticles superlattices (NPS). The experiments have been performed from an optical femtosecond pump-probe scheme across the optical plasmon resonance of the superlattice. Our experiments allow to estimate the collective elastic response (sound velocity) of the NPS as well as an estimate of the nano-contact elastic stiffness. It appears that the light-induced coherent acoustic phonon pulse has a typical in-depth spatial extension of about 45 nm which is roughly 4 times the optical skin depth in gold. The modeling of the transient optical reflectivity indicates that the mechanism of phonon generation is achieved through ultrafast heating of the NPS assisted by light excitation of the volume plasmon. These results demonstrate how it is possible to map the photon-electron-phonon interaction in subwavelength nanostructures.PACS numbers: 78.67. Pt, 73.20.Mf, Plasmon assisted subwavelength light transmission is a key physical mechanism for modern nano-optics and nano-plasmonics [1]. The propagation of plasmonpolariton waves in nano particles nanostructures (chains, arrays) is at the core of intense fundamental investigations and has led to numerous reports [2-6]. For plasmonic applications, it is obviously crucial to understand and control the damping of these plasmonpolariton waves, i.e. the collective propagation distance. This propagation distance as well as a more general description of the dispersion curves for both longitudinal and transverse light electric field have already been obtained for supported 1D chains [2][3][4][5]. The propagation distance is currently limited by the intrinsic electronphonon, electron-defect interaction within each particle as well as radiation loss. In some particular 2D optical spectroscopy imaging, it has been shown recently that the propagation/distribution of the plasmon-polariton could even be mapped for 1D nanoparticles chains [2,6]. The visualization of these plasmons at the interface air/nanostructure with near-field imaging [5] or with an electron beam imaging [7] were also reported. This stateof-art 2D imaging is however limited to 1D or 2D systems, i.e. to surface plasmonics and no local measurement of volume plasmon-polariton propagation has been reported for 3D nanoparticles arrays so far. Most of the plasmonic responses in nanoparticles superlattices are obtained indeed from far field optical absorbance measurements [8,9]. Because of the difficulty to probe the innner part of a plasmonic superlattices, no quantitative depth profiling description of the plasmon-polariton propagation have been reported to date. However, it is known that ultrafast optical techniques can provide a picture in time and space of the light-matter interaction [10][11][12]. In particular, in case of femtosecond light pulses, the light-matter coupling can lead to the emission of coherent acoustic phonons that occurs all over the spatial extension where the light energy is converted in...

show abstract

mentioning

confidence: 99%

Ultrafast acousto-plasmonics in gold nanoparticle superlattices

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…These effects have been studied extensively in ultrafast linear and nonlinear reflectivity experiments [1][2][3][4][5][6][7][8] and, more recently, in time-resolved x-ray Bragg scattering experiments [9][10][11][12][13][14][15]. X-ray diffraction has the advantage that it can provide quantitative structural information.…”

mentioning

confidence: 99%

Transient Strain Driven by a Dense Electron-Hole Plasma

et al. 2003

View full text Add to dashboard Cite

show abstract

“…These e-h and temperature distributions lead to an initial stress mediated by the deformation potential and the thermal expansion coefficient, respectively. For semiconductors the deformation potential mechanism is often the dominant mechanism, and this is expected to be the case here [3,[5][6][7]. We therefore assume that the spatial distribution of the initial stress is proportional to that of the initial excited e-h density, independent of the excess electron energy.…”

Section: Discussionmentioning

confidence: 99%

Wavelength selective photoexcitation of picosecond acoustic-phonon pulses in a triple GaAs/Al0.3Ga0.7As quantum well structure

Matsuda

Ishii

Fukui

et al. 2002

Physica B: Condensed Matter

View full text Add to dashboard Cite

Ultrashort coherent phonon-pulse generation and detection is investigated in a GaAs-Al 0:3 Ga 0:7 As quantum well structure containing three wells of different widths using an optical pump and probe method. The pump photon energy is tuned to the region of the hh1-e1 transition energies of the wells and the probe photon energy is chosen for detection of the phonon pulses that reach the sample surface. By studying the dependence of the probe reflectance change on the pump photon energy, we demonstrate the possibility of wavelength-selective excitation of picosecond acoustic-phonon pulses in quantum wells. r

show abstract

Coherent phonon emission in the supersonic expansion of photoexcited electron-hole plasma in Ge

Cited by 40 publications

References 15 publications

Ultrafast acousto-plasmonics in gold nanoparticle superlattices

Ultrafast acousto-plasmonics in gold nanoparticle superlattices

Transient Strain Driven by a Dense Electron-Hole Plasma

Wavelength selective photoexcitation of picosecond acoustic-phonon pulses in a triple GaAs/Al0.3Ga0.7As quantum well structure

Contact Info

Product

Resources

About