Ultrafast optical generation of coherent phonons inCdTe1−xSexquantum dots

Tailored Hypersound Generation in Single Plasmonic Nanoantennas

“…For short (~100fs) excitation pulse-width and periods on the tens of picosecond, the dominant mechanism is the displacive one, ending up in a cosine-type oscillation [13,19,23]. However, the phase is the most sensitive of the parameters to test either the underlying mechanisms or any coupling between modes [20], at times making interpretation difficult [24,28].…”

“…Techniques for detection and control of coherent optical and acoustic phonons have been intensively studied, as well as the various physical underlying generation mechanisms discussed [16][17][18][19][20][21]. In plasmonic nanostructures, light pulse absorption generates a population of hot electrons which can be further enhanced by the resonant excitation of surface plasmons.…”

Phonon spectroscopy of CdSe1–xTex nanocrystals grown in a borosilicate glass

“…The studies of phonon spectra of other ternary II-VI nanocrystals are extremely scarce [15,16]. In both reported cases the spectra for just one CdSe 1-x Te x composition were presented.…”

Dynamics of coherent phonons in CsPbCl3 nanocrystals studied by femtosecond laser spectroscopy

“…The origin of phonon generation in both regimes is the fact that (real or virtual) electron occupation exerts a force on the ions in the crystal causing lattice distortions. This makes it possible to describe the modulation of the light transmission by coherent phonon www.pss-c.com oscillations in both the transparent and opaque materials by a unified theory using two complex tensors [3,12]. In fact the situation is more complicated, involving multi-particle interactions and correlations, which make the theory rather difficult [13].…”

“…Applications in THz spectroscopy and coherent control of ionic motion in solids are also anticipated. Phonons play an important role in carrier dephasing and relaxation in semiconductor nanocrystals [2] but only a few reports appeared on coherent optical-phonon generation in the nanocrystals [3]. We reported recently on the generation of coherent optical phonons in CsPbCl 3 nanocrystals in CsCl matrix by femtosecond laser-pulse illumination [4,5].…”