Electrostrictive in-situ nanoparticle detection with coherent Rayleigh-Brillouin scattering (Conference Presentation)

2017 ◽  
Author(s):  
Alexandros Gerakis ◽  
Mikhail N. Shneider ◽  
Yevgeny Raitses ◽  
Brentley C. Stratton
Keyword(s):  
Brillouin Scattering ◽  
Nanoparticle Detection

In situ brillouin scattering investigation of spin waves during the fcc to bcc transition of Fe/Cu[100] films

2003 ◽  
Vol 39 (5) ◽  
pp. 2708-2710 ◽  
Author(s):  
G. Carlotti ◽  
G. Gubbiotti ◽  
M. Madami ◽  
G. Socino ◽  
S. Tacchi
Keyword(s):  
Brillouin Scattering ◽  
Spin Waves

An all-optical, in situ diagnostic for large molecule and nanoparticle detection

2017 ◽  
Author(s):  
Alexandros Gerakis ◽  
Mikhail N. Shneider ◽  
Brentley C. Stratton ◽  
Yevgeny Raitses
Keyword(s):  
Large Molecule ◽  
Nanoparticle Detection ◽  
All Optical

scholarly journals Irradiation-Induced Amorphization and Elastic Shear Instability in Intermetallic Compounds

1989 ◽  
Vol 157 ◽  
Author(s):  
J. Koike ◽  
P. R. Okamoto ◽  
L. E. Rehn ◽  
R. Bhadra ◽  
M. H. Grimsditch ◽  
...  
Keyword(s):  
Shear Modulus ◽  
Structural Information ◽  
Brillouin Scattering ◽  
Shear Instability ◽  
Crystalline Lattice ◽  
Tandem Accelerator ◽  
Voltage Electron ◽  
Elastic Shear ◽  
State Amorphization

ABSTRACTPreviously we reported a substantial (∼ 50 %) decrease in shear modulus prior to amorphization in Kr irradiated Zr3Al, and proposed that amorphization is triggered when the crystalline lattice becomes unstable against shear stress. In the present work, the relation between amorphization and shear elastic instability has been investigated in two additional compounds (FeTi and NiAl) during room temperature irradiation with 1.7-MeV Kr+. A shear modulus was measured using Brillouin scattering; structural information was obtained in situ in a high voltage electron microscope interfaced to a tandem accelerator.During irradiation of FeTi, chemical disordering and a large (∼40 %) decrease of shear modulus were observed, and an amorphous phase developed subsequently. In contrast, NiAl remained crystalline and chemically ordered during irradiation, and exhibited only a ∼ 10 % decrease in shear modulus. Hence, these two results provide further support that a shear instability triggers irradiation-induced amorphization. The shear instability mechanism may also apply to other solid-state amorphization techniques, e.g. hydrogen charging and mechanical deformation.

scholarly journals Fiber-integrated Brillouin microspectroscopy: Towards Brillouin endoscopy

2017 ◽  
Vol 10 (06) ◽  
pp. 1742002 ◽  
Author(s):  
Irina V. Kabakova ◽  
YuChen Xiang ◽  
Carl Paterson ◽  
Peter Török
Keyword(s):  
Optical Fiber ◽  
Brillouin Scattering ◽  
Region Of Interest ◽  
The Body ◽  
Propagation Model ◽  
Micromechanical Characterization ◽  
First Time

Brillouin imaging (BI) for micromechanical characterization of tissues and biomaterials is a fast-developing field of research with a strong potential for medical diagnosis of disease-modified tissues and cells. Although the principles of BI imply its compatibility with in vivo and in situ measurements, the integration of BI with a flexible catheter, capable of reaching the region of interest within the body, is yet to be reported. Here, for the first time, we experimentally investigate integration of the Brillouin spectroscope with standard optical fiber components to achieve a Brillouin endoscope. The performance of single-fiber and dual-fiber endoscopes are demonstrated and analyzed. We show that a major challenge in construction of Brillouin endoscopes is the strong backward Brillouin scattering in the optical fiber and we present a dual-fiber geometry as a possible solution. Measurements of Brillouin spectra in test liquids (water, ethanol and glycerol) are demonstrated using the dual-fiber endoscope and its performance is analyzed numerically with the help of a beam propagation model.

Radiation-induced amorphization of intermetallic compounds

1989 ◽  
Vol 47 ◽  
pp. 650-651
Author(s):  
P. R. Okamoto
Keyword(s):  
Intermetallic Compounds ◽  
Brillouin Scattering ◽  
Voltage Electron ◽  
Glass Transformation ◽  
Progressive Loss ◽  
Fundamental Understanding ◽  
Ordered Intermetallic ◽  
Radiation Induced

Many ordered intermetallic compounds become amorphous when irradiated at low temperatures with energetic particles. There is still no fundamental understanding of why some compounds but not others are susceptible to amorphization. However, recent studies indicate that a progressive loss of chemical long-range order (LRO) is a necessary, though not a sufficient condition for the crystal-to-glass transformation. To shed further light on the role of chemical disordering, our work has focused on correlating the structural effects of chemical disorder on the shear modulus of a number of LI2, B2, and A-15 type intermetallic compounds under irradiation conditions where some become amorphous and others remain crystalline.The Brillouin scattering technique was used to measure the change in the velocity of sound (Vs) relative to that of the unirradiated state (Vos) in Zr3Al, FeAl, FeTi, NiAl, and Nb3Ir during irradiation at 298 K with 1-MeV Kr+ ions. The corresponding changes in the Bragg-Williams LRO parameter (S/So), and lattice expansion (Δa/ao) were measured by means of electron diffracting during in-situ irradiation with 1-MeV Kr in the ANL high voltage electron microscope.

In situ Brillouin scattering investigation of thin Fe/Cu(1 1 1) films

2004 ◽  
Vol 272-276 ◽  
pp. E807-E809
Author(s):  
S Tacchi ◽  
M Madami ◽  
G Gubbiotti ◽  
G Carlotti ◽  
L Verdini
Keyword(s):  
Brillouin Scattering

Thermomechanical Behaviour of AgNi Multilayers and Magnetoelastic Effects

1993 ◽  
Vol 308 ◽  
Author(s):  
V. Pelosin ◽  
B. Rodmacq ◽  
S.R. Teixeira ◽  
J. Hillairet ◽  
G. Carlotti
Keyword(s):  
Domain Walls ◽  
Defect Density ◽  
Brillouin Scattering ◽  
Magnetic Domain ◽  
Internal Stresses ◽  
State Of Stress ◽  
Thermomechanical Behaviour ◽  
Magnetic Domain Walls ◽  
Vibrating Reed

ABSTRACTThe elastic and anelastic properties of AgNi multilayers prepared by sputtering were investigated during the course of anneal cycles. The respective temperature variations of some of the elastic constants and moduli were followed by Brillouin scattering and dynamical methods based on use of a torsion pendulum and a vibrating-reed system. The last two enabled to investigate the internal damping associated with the presence of two-dimensional defects. It appears that the motion of interfaces and grain boundaries is inhibited by the high defect density. In contrast, substantial effects associated with the motion of the magnetic domain walls were evidenced. Concurrently, internal stresses were studied by in situ deflection measurements. Flow stress values on the order of 1 GPa were observed. Dilatometry experiments showed that a large part of the non-recoverable modifications in the state of stress induced by thermal cycling originates in the densification of the material.

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