Transient grating measurements of picosecond acoustic pulses in metal films

Crimmins, Timothy F.; Maznev, A. A.; Nelson, Keith A.

doi:10.1063/1.123545

Cited by 53 publications

(38 citation statements)

References 17 publications

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“…These techniques use a laser-generated SAW, the wavelength of which is determined by the interference of two beams intersecting the sample at different angles 18,19 and obtained by passing the incident beam through a diffraction mask 20 or an absorption grating etched into, 21 or deposited 22 onto, the sample. Time-delayed laser probe pulses are then used to obtain the SAW velocity.…”

Section: Introductionmentioning

confidence: 99%

Elastic constants of single-crystalTiNx(001)(0.67⩽x⩽1.0)
Lee
¹
,
Ohmori
²
,
Shin
³

et al. 2005
Phys. Rev. B
81
5
61
1
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The elastic constants c 11 and c 44 of single-crystal NaCl-structure ␦-TiN x ͑001͒ layers, with x ranging from 0.67 to 1.0, were determined using sound velocity measurements. Picosecond ultrasonic optical pump/probe techniques were employed to generate and detect longitudinal sound waves and surface acoustic waves ͑SAW͒ in order to obtain c 11 ͑x͒ and c 44 ͑x͒, respectively. SAW generation was achieved by depositing a periodic series of Al bars on the TiN x ͑001͒ layers to spatially modulate the surface reflectivity. c 11 and c 44 were found to decrease continuously from 626 and 156 GPa with x = 1 to 439 and 92 GPa with x = 0.67. The Voit-Reuss-Hill average aggregate elastic moduli E VRH ͑x͒ obtained from our measured c 11 ͑x͒ and c 44 ͑x͒ values are in good agreement with previous TiN x ͑001͒ nanoindentation results.

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Section: Introductionmentioning

confidence: 99%

Elastic constants of single-crystalTiNx(001)(0.67⩽x⩽1.0)
Lee
¹
,
Ohmori
²
,
Shin
³

et al. 2005
Phys. Rev. B
81
5
61
1
View full text Add to dashboard Cite

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“…The signals in our experiments are all measured through optical heterodyne detection 13,18,19 of the diffracted field, as illustrated in Fig. 2.…”

Section: A Heterodyne Tg Detectionmentioning

confidence: 99%

Thermal, structural, and orientational relaxation of supercooled salol studied by polarization-dependent impulsive stimulated scattering

Glorieux

Nelson

Hinze

et al. 2002

The Journal of Chemical Physics

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On the mechanism of reorientational and structural relaxation in supercooled liquids: The role of border dynamics and cooperativity Impulsive stimulated thermal scattering study of structural relaxation in supercooled glycerol Time-resolved transient grating experiments with various polarizations are used to separate different responses and measure their dynamics in supercooled liquid salol. A contribution to signal from orientational alignment induced by flow that arises from thermal expansion is demonstrated. This contribution is distinct from that due to orientational alignment induced directly by the excitation light through the molecular polarizability anisotropy ͑i.e., through the optical Kerr effect͒. It is also distinct from signal contributions due to density modulations induced by thermal expansion. The results offer additional insight into salol dynamics and into time-dependent transient grating measurements of this class. Depending on the light polarizations used, any of the signal contributions can be eliminated or highlighted.

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“…Laser-based ultrasonic systems have seen widespread use in the measurement and characterization of thin films and micro-and nanoscale devices [1][2][3][4][5][6][7][8] . Most systems use pulsed-laser sources to generate ultrasound in the hundreds of megahertz to the low gigahertz range.…”

Section: Introductionmentioning

confidence: 99%

Ultra-broadband high-resolution photoacoustic / photothermal microscopy system for material characterization

Sampathkumar

2014

SPIE Proceedings

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A non-contact ultra-broadband photoacoustic (PA) / photothermal (PT) microscopy system has been developed to characterize material properties of specimens using optical transduction techniques. PT microscopy exploits optical changes induced by heat to highlight the presence of inhomogeneities such as defects, contaminants, inclusions, and impurities in materials. A monochromatic light source (e.g., a pulsed and amplitude-modulated laser) typically is used to create the PA effect. Heating the material produces a stress distribution that launches broadband ultrasonic emissions. Measurement of the ultrasonic emissions can be used to compute material properties like density, elastic modulus, anisotropy, etc. Sub-surface features can be detected using time-reversal and back-propagation techniques. In this work, PT-induced refractive index changes as well as the PA effect are detected optically on a microscopic scale using a Michelson-interferometer configuration. The system has a spatial resolution of ~600 nm with a detection bandwidth of 1 GHz and a displacement sensitivity of 1 pm per root Hz. Experimental results from thin films, coatings, nanoelectromechanical systems (NEMS) and biological samples demonstrate the versatility of the system as a nondestructive tool for material characterization.

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Transient grating measurements of picosecond acoustic pulses in metal films

Abstract: Transient grating measurement of surface acoustic waves in thin metal films with extreme ultraviolet radiation

Cited by 53 publications

References 17 publications

Elastic constants of single-crystalTiNx(001)(0.67⩽x⩽1.0)
Lee
¹
,
Ohmori
²
,
Shin
³

et al. 2005
Phys. Rev. B
81
5
61
1
View full text Add to dashboard Cite

Elastic constants of single-crystalTiNx(001)(0.67⩽x⩽1.0)
Lee
¹
,
Ohmori
²
,
Shin
³

et al. 2005
Phys. Rev. B
81
5
61
1
View full text Add to dashboard Cite

Thermal, structural, and orientational relaxation of supercooled salol studied by polarization-dependent impulsive stimulated scattering

Ultra-broadband high-resolution photoacoustic / photothermal microscopy system for material characterization

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Transient grating measurements of picosecond acoustic pulses in metal films

Abstract: Transient grating measurement of surface acoustic waves in thin metal films with extreme ultraviolet radiation

Cited by 53 publications

References 17 publications

Elastic constants of single-crystalTiNx(001)(0.67⩽x⩽1.0)Lee1, Ohmori2, Shin3 et al. 2005Phys. Rev. B815611View full textAdd to dashboardCite

Elastic constants of single-crystalTiNx(001)(0.67⩽x⩽1.0)Lee1, Ohmori2, Shin3 et al. 2005Phys. Rev. B815611View full textAdd to dashboardCite

Thermal, structural, and orientational relaxation of supercooled salol studied by polarization-dependent impulsive stimulated scattering

Ultra-broadband high-resolution photoacoustic / photothermal microscopy system for material characterization

Contact Info

Product

Resources

About

Elastic constants of single-crystalTiNx(001)(0.67⩽x⩽1.0)
Lee
¹
,
Ohmori
²
,
Shin
³

et al. 2005
Phys. Rev. B
81
5
61
1
View full text Add to dashboard Cite

Elastic constants of single-crystalTiNx(001)(0.67⩽x⩽1.0)
Lee
¹
,
Ohmori
²
,
Shin
³

et al. 2005
Phys. Rev. B
81
5
61
1
View full text Add to dashboard Cite