Guided acoustic waves Brillouin scattering in multi-core fibers

2017 ◽  
Author(s):  
H. Hagai Diamandi ◽  
Yosef London ◽  
Avi Zadok
Keyword(s):  
Acoustic Waves ◽  
Brillouin Scattering

scholarly journals Elastic Constants of Diamond-Like Carbon Films by Surface Brillouin Scattering

1999 ◽  
Vol 593 ◽  
Author(s):  
A.C. Ferrari ◽  
J. Robertson ◽  
R. Pastorelli ◽  
M.G. Beghi ◽  
C.E. Bottani
Keyword(s):  
Thin Films ◽  
Amorphous Carbon ◽  
Elastic Constants ◽  
Acoustic Waves ◽  
Brillouin Scattering ◽  
Surface Acoustic Waves ◽  
Carbon Films ◽  
Diamond Like Carbon ◽  
Amorphous Carbon Films ◽  
Tetrahedral Amorphous Carbon

ABSTRACTThe elastic constants of thin Diamond-Like Carbon (DLC) films supply important information, but their measurement is difficult. Standard nanoindentation does not directly measure the elastic constants and has strong limitations particularly in the case of hard thin films on softer substrates, such as tetrahedral amorphous carbon on Si. Surface acoustic waves provide a better mean to investigate elastic properties. Surface Brillouin scattering (SBS) intrinsically probes acoustic waves of the wavelength which is appropriate to test the properties of films in the tens to hundreds of nanometers thickness range. SBS can be used to derive all the isotropic elastic constants of hard-on-soft and soft-on-hard amorphous carbon films of different kinds, with thickness down to less than 10 nm. The results help to resolve the previous uncertainties in mechanical data. The Young's modulus of tetrahedral amorphous carbon (ta-C) turns out to be lower than that of diamond, while the moduli of hydrogenated ta-C (ta-C:H) are considerably lower than those of ta-C because of the weakening effect of C-H bonding.

Brillouin-Scattering Study on Mixing Effects of Acoustic Waves in Photoconductive CdS

1974 ◽  
Vol 36 (3) ◽  
pp. 747-752 ◽  
Author(s):  
Masayoshi Yamada ◽  
Chihiro Hamaguchi ◽  
Junkichi Nakai
Keyword(s):  
Acoustic Waves ◽  
Brillouin Scattering ◽  
Mixing Effects ◽  
Scattering Study

scholarly journals Elastic Constants of Diamond Like Carbon Films by Surface Brillouin Scattering

1999 ◽  
Vol 594 ◽  
Author(s):  
A. C. Ferrari ◽  
J. Robertson ◽  
R. Pastorelli ◽  
M. G. Beghi ◽  
C. E. Bottani
Keyword(s):  
Thin Films ◽  
Amorphous Carbon ◽  
Elastic Constants ◽  
Acoustic Waves ◽  
Brillouin Scattering ◽  
Surface Acoustic Waves ◽  
Carbon Films ◽  
Diamond Like Carbon ◽  
Amorphous Carbon Films ◽  
Tetrahedral Amorphous Carbon

AbstractThe elastic constants of thin Diamond-Like Carbon (DLC) films supply important information, but their measurement is difficult. Standard nanoindentation does not directly measure the elastic constants and has strong limitations particularly in the case of hard thin films on softer substrates, such as tetrahedral amorphous carbon on Si. Surface acoustic waves provide a better mean to investigate elastic properties. Surface Brillouin scattering (SBS) intrinsically probes acoustic waves of the wavelength which is appropriate to test the properties of films in the tens to hundreds of nanometers thickness range. SBS can be used to derive all the isotropic elastic constants of hard-on-soft and soft-on-hard amorphous carbon films of different kinds, with thickness down to less than 10 nm. The results help to resolve the previous uncertainties in mechanical data. The Young's modulus of tetrahedral amorphous carbon (ta-C) turns out to be lower than that of diamond, while the moduli of hydrogenated ta-C (ta-C:H) are considerably lower than those of ta-C because of the weakening effect of C-H bonding.

Stimulated Brillouin scattering of an electromagnetic wave in a magnetoactive dissipative multi-ion-species plasma

1995 ◽  
Vol 53 (2) ◽  
pp. 127-133 ◽  
Author(s):  
M. Bose
Keyword(s):  
Growth Rate ◽  
Electromagnetic Wave ◽  
Acoustic Waves ◽  
Brillouin Scattering ◽  
Negative Ions ◽  
Stimulated Brillouin Scattering ◽  
Magnetized Plasma ◽  
Ion Acoustic Waves ◽  
Stimulated Brillouin ◽  
Ion Species

Stimulated Brillouin scattering of an electromagnetic wave is investigated analytically in a dissipative magnetized plasma in the presence of negative ions. With an increase in the number of negative ions (maintaining quasi-neutrality), it is found that the growth rate of ion-acoustic waves decreases very slowly up to 50% concentration (i.e. half of the total ionic contribution) of negative ions. Further increase in the number density of negative ions beyond 50% results in a sharp fall in growth rate.

Acoustic Microscopy and Surface Brillouin Scattering of Amorphous Carbon Pressure-Synthesized From C60

2001 ◽  
Vol 675 ◽  
Author(s):  
Pavel V. Zinin ◽  
Murli. H. Manghnani ◽  
Sergey Tkachev ◽  
Xinya Zhang ◽  
Alexander G. Lyapin ◽  
...  
Keyword(s):  
Longitudinal Wave ◽  
Elastic Properties ◽  
Amorphous Carbon ◽  
Acoustic Waves ◽  
Brillouin Scattering ◽  
Longitudinal Velocity ◽  
Acoustic Microscopy ◽  
High Pressure And Temperature ◽  
Carbon Network ◽  
Surface Rayleigh Wave

ABSTRACTHere, we report successful measurements by surface Brillouin scattering (SBS) and scanning acoustic microscopy (SAM) of the elastic properties of small specimens of amorphous carbon obtained from C60 under high pressure and temperature. The superhard phases of amorphous carbon were synthesized from C60 at pressure 13 – 13.5 GPa and temperature 800–900°C. Two types of acoustic waves have been detected by SBS in superhard samples: surface Rayleigh wave and bulk longitudinal wave. The longitudinal velocity (νL) in the hardest sample is slightly lower than longitudinal wave velocity in diamond in [110] direction. Simultaneous measurements of the Rayleigh and longitudinal wave velocities make it possible to determine shear and bulk elastic moduli of the specimens. Obtained elastic properties for amorphous carbon synthesized under pressure 13.5 GPa and temperature 900°C are close to those for diamond, indicating that bonds among amorphous carbon network are diamond bonding dominated.

scholarly journals Time-domain Brillouin Scattering as a Local Temperature Probe in Liquids

MRS Advances ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 9-14
Author(s):  
Ievgeniia Chaban ◽  
Hyun D. Shin ◽  
Christoph Klieber ◽  
Rémi Busselez ◽  
Vitaly Gusev ◽  
...  
Keyword(s):  
Light Scattering ◽  
Frequency Shift ◽  
Time Domain ◽  
Acoustic Waves ◽  
Brillouin Scattering ◽  
Local Temperature ◽  
Pump Probe ◽  
Probe Technique ◽  
Temperature Probe

ABSTRACTWe present results of time-domain Brillouin scattering (TDBS) to determine the local temperature of liquids. TDBS is based on an ultrafast pump-probe technique to determine the light scattering frequency shift caused by the propagation of coherent acoustic waves in a sample. Since the temperature influences the Brillouin scattering frequency shift, the TDBS signal probes the local temperature of the liquid. Results for the extracted Brillouin scattering frequencies recorded at different liquid temperatures and at different laser powers are shown to demonstrate the usefulness of TDBS as a temperature probe.

Brillouin Scattering Studies of Surface Acoustic Waves in SiC

2004 ◽  
Vol 457-460 ◽  
pp. 653-656 ◽  
Author(s):  
G.T. Andrews ◽  
Maynard J. Clouter ◽  
B. Mroz ◽  
Y. Shishkin ◽  
Yue Ke ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Brillouin Scattering ◽  
Surface Acoustic Waves
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