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Showing 1 to 17 of 17 for “"Brillouin light scattering"”.
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Transparent Tissues and Porous Thin Films: A Brillouin Light Scattering Study
… tissues in the eye that control the focusing of light, while strains within nano-scale films and coatings in the next generation of microelectronic devices could have profound effects on their functionality. Measurement of the elastic properties of such microscale structures has however proven …
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Acoustic mode quantization in nanostructures
Brillouin light scattering has been employed to investigate the confined acoustic modes of three different nanostructures, viz. silica and polystyrene nanospheres, hollow carbon microspheres, and GeO2 nanocubes. The confined acoustic modes observed show significantly different features from those …
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Brillouin scattering from single-crystal dysprosium and gadolinium films
Brillouin light scattering studies have been made on the temperature dependence and dispersion of long-wavelength acoustic phonons in single-crystal Dy films and long-wavelength acoustic magnons in single-crystal Gd films. The spectra were analyzed by using elastic and magnetic continuum models for …
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Structural relaxations of glass-forming alkali-borate and alkali-tellurite in the GHz frequency range
The Brillouin light scattering technique was used to determine the high-frequency complex mechanical modulus of a series of strong glass-forming alkali-borate and fragile glass-forming alkali-tellurite systems. Lithium, sodium, and potassium, were added to the systems to determine their influence …
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Quantization of spin waves in ferromagnetic Ni80Fe20 nanoring
… lithography and their spin dynamicsmeasured by Brillouin light scattering with the magnetic field applied along long (easy) axes of the rings. The dispersionless behavior of the spin wave modes observed reveals their standing wave nature. Two-dimensional simulations and analytical calculations …
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Properties of cobalt/copper and cobalt/palladium multilayers.
… to investigate the magneto-optical properties. Brillouin light scattering spectroscopy was used to determine the effective elastic constants of the Co/Cu multilayers and the magnetic properties of the sputtered Co/Pd multilayers.
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Brillouin scattering investigation of nanomagnetic structures
Brillouin light scattering is employed to study the dynamical properties of arrays of vertical ferromagnetic nanowires and nanorings, which show great promise as high-density magnetic storage and sensor devices. Three closely related projects are reported: (1) observation of bulk magnon …
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Spin wave characterization in a 1D YIG magnonic crystal
… (YIG) magnonic crystal using time-resolved Brillouin light scattering (TR-BLS) measurements. Magnonic crystals are a promising candidate to aid in developing spin-based devices that exploit the spin of the electron since magnonic crystals can be used to control the information transmitted by …
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Studies of structure and dynamics of biological macro-molecular assemblies by low angle neutron diffraction and inelastic X-ray scattering
… Na-DNA molecules with the inelastic X-ray scattering (IXS). In the second part, we have developed a new efficient method to calculate the inter-particle structure factor in a simple fluid interacting with a two-Yukawa term potential and apply it to study the kinetic phase diagram and …
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Hypersonic phononic crystals
… of a lattice constant and composition using Brillouin light scattering and numerical simulations. This set of relatively simple multilayer structures represents an excellent platform to gain a basic understanding of phononic band gap phenomena. In addition, their in-plane phonon dispersion is …
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STRAIN AND TEMPERATURE MEASUREMENT FROM DISTRIBUTED FIBER OPTIC SENSORS IN PERFORMANCE-BASED FIRE ENGINEERING
… temperature measurements based on Rayleigh and Brillouin light scattering. The first part aims to quantify the Rayleigh scattering based measurement accuracy of distributed fiber optic sensors under a heating-holding load protocol and characterize the effect of polymer coating on the sensors as …
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Brillouin scattering from single-crystal dysprosium and gadolinium films
"Brillouin light scattering studies have been made on the temperature dependence and dispersion of long-wavelength acoustic phonons in single-crystal Dy films and longwavelength acoustic magnons in single-crystal Gd filins. The spectra were analyzed by using elastic and magnetic continuum models …
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Elasticity across the post-stishovite transition in subducted basalt
… Specifically, I measured sound velocities using Brillouin light scattering and impulsive stimulated light scattering, Raman shifts of optic modes using Raman spectroscopy, and atomistic properties using synchrotron single-crystal X-ray diffraction in diamond anvil cells at high pressure. Sound …
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Microstructural Analysis of Garnet-Heavy Metal Heterostructures
… behavior allows REIGs to be studied via light techniques such as magnetooptical Kerr effect imaging and Brillouin light scattering [7]. While these magnetic interactions show promise for REIGs in spintronics applications, integrating these materials on Si requires further microstructure …
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Toward ultra-broadband photoacoustic spectroscopy of supercooled liquids
… of 10 MHz to 1 GHz with impulsive stimulated light scattering (ISS) and 8 GHz to 200 GHz with picosecond ultrasonics. In this work, I present advances in photoacoustic techniques with the goal of extending the range of frequencies accessible by these methods. To achieve higher-frequency …
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Nanostructured magnetic materials for integrated magnonic devices
… coupling. Additionally, the field-dependent Brillouin Light Scattering (BLS) spectra unveil distinct spin wave modes, with ES films showing well-resolved bulk and Damon-Eshbach surface spin wave modes, while non-ES films exhibit mode doublets below a certain applied field threshold. These …
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Unique templating of and applications enabled through mesoporous colloids
… and used as a template for silicon deposition. Brillouin Light Scattering (BLS) experiments conducted on a silicon templated silica colloidal crystal show unusual behavior in the BLS spectrum where the Stokes and anti-Stokes phonon intensities were asymmetrical. The dispersion relationship …