Results 41 to 50 of about 1,812 (181)

Optimization of a perfect absorber multilayer structure by genetic algorithms [PDF]

, 2018
Background: An increasing interest has been recently grown in the development of nearly perfect absorber materials for solar energy collectors and more in general for all the thermophotovoltaic applications.
Li Voti, Roberto
core   +1 more source

Competition between inverse piezoelectric effect and deformation potential mechanism in undoped GaAs revealed by ultrafast acoustics

EPJ Web of Conferences, 2013
By using the picosecond ultrasonics technique, piezoelectric effect in GaAs undoped sample at both faces (A[111] and B[-1-1-1]) is experimentally studied.
Pezeril T., Ruello P., Vaudel G., Gusev V.   +3 more
doaj   +1 more source

High-Acoustic-Impedance Tantalum Oxide Layers for Insulating Acoustic Reflectors [PDF]

, 2012
This work describes the assessment of the acoustic properties of sputtered tantalum oxide films intended for use as high-impedance films of acoustic reflectors for solidly mounted resonators operating in the gigahertz frequency range.
Capilla Osorio, José, Clement Lorenzo, Marta, Devos, Arnaud, Iborra Grau, Enrique, Olivares Roza, Jimena, Sangrador García, Jesús   +5 more
core   +2 more sources

Ta2O5/SiO2 insulating acoustic mirrors for AlN-based X-band BAW resonators [PDF]

, 2011
This work describes the performance of AlN-based bulk acoustic wave resonators built on top of insulating acoustic reflectors and operating at around 8 GHz.
Capilla Osorio, José, Clement Lorenzo, Marta, Devos, Arnaud, Felmetsger, Valeriy, Olivares Roza, Jimena   +4 more
core   +1 more source

Characterization of thin-film adhesion and phonon lifetimes in Al/Si membranes by picosecond ultrasonics

New Journal of Physics, 2017
We quantitatively study interfacial adhesion in a two-layer membrane system consisting of Al and Si with femtosecond time-resolved laser spectroscopy. High-frequency acoustic pulses in the sub-THz regime are utilized to characterize the membrane system ...
Martin Grossmann, Martin Schubert, Chuan He, Delia Brick, Elke Scheer, Mike Hettich, Vitalyi Gusev, Thomas Dekorsy   +7 more
doaj   +1 more source

Photoelastic properties of zinc-blende (AlGa)N in the UV: picosecond ultrasonic studies [PDF]

, 2018
Picosecond ultrasonics was used to study the photoelastic properties of zinc-blende (cubic) c-AlₓGa₁₋ₓN with x around 0.5 The velocities for longitudinal sound in the alloys were measured using ultrafast UV pump-probe experiments with (AlGa)N
Akimov, Andrey V., Kent, Anthony J., Mellor, Christopher J., Novikov, Sergei V., Whale, Josh   +4 more
core   +2 more sources

Picosecond ultrasonics with a free-running dual-comb laser

Optics Express, 2021
We present a free-running 80-MHz dual-comb polarization-multiplexed solid-state laser which delivers 1.8 W of average power with 110-fs pulse duration per comb. With a high-sensitivity pump-probe setup, we apply this free-running dual-comb laser to picosecond ultrasonic measurements.
Justinas Pupeikis, Benjamin Willenberg, Francois Bruno, Mike Hettich, Alexander Nussbaum-Lapping, Matthias Golling, Carolin P. Bauer, Sandro L. Camenzind, Abdelmjid Benayad, Patrice Camy, Bertrand Audoin, Christopher R. Phillips, Ursula Keller   +12 more
openaire   +4 more sources

Direct Observation of Propagating Gigahertz Coherent Guided Acoustic Phonons in Free Standing Single Copper Nanowires

, 2014
We report on gigahertz acoustic phonon waveguiding in free-standing single copper nanowires studied by femtosecond transient reflectivity measurements.
Amziane A., Bannov N., Belliard L., Bernard Perrin, Bienville T., Boukai A. I., Burgin J., Cardinal M. F., Chang D. E., Chree C., Cyril Jean, Feng X. L., Hirsch L. R., Huang X., Jais P. M., Juvé V., Kelf T. A., Khelfa H., Laurent Belliard, Ledbetter H., Liang H., Lin K.-H., Loïc Becerra, Maier S. A., Major T. A., Major T. A., Mante P.-A., Marco Cassinelli, Maria Eugenia Toimil-Molares, Mingo N., Molares M. T., Mounier D., Novo C., Olivier Thomas, Pochhammer L., Ristow O., Royer D., Silk M., Siry P., Staleva H., Staleva H., Staleva H., Thomas W. Cornelius, Thomsen C., van Dijk M., Vertikov A., Zijlstra P.   +46 more
core   +2 more sources

Controlled lasing from active optomechanical resonators [PDF]

, 2014
Planar microcavities with distributed Bragg reflectors (DBRs) host, besides confined optical modes, also mechanical resonances due to stop bands in the phonon dispersion relation of the DBRs.
Akimov, A. V., Bayer, M., Brodbeck, S., Brueggemann, C., Czerniuk, T., Glavin, B. A., Hoefling, S., Kamp, M., Schneider, C., Tepper, J., Yakovlev, D. R.   +10 more
core   +3 more sources

Nonlinear Acoustics at GHz Frequencies in a Viscoelastic Fragile Glass Former [PDF]

, 2014
Using a picosecond pump-probe ultrasonic technique, we study the propagation of high-amplitude, laser-generated longitudinal coherent acoustic pulses in the viscoelastic fragile glass former DC704. We observe an increase of almost ten percent in acoustic
Gusev, Vitalyi E., Klieber, Christoph, Nelson, Keith A., Pezeril, Thomas   +3 more
core   +3 more sources