Elastic-Constant Measurement in Oxide and Semiconductor Thin Films by Brillouin Oscillations Excited by Picosecond Ultrasound

Ogi, Hirotsugu; Shagawa, Tomohiro; Nakamura, Nobutomo; Hirao, Masahiko; Odaka, Hiroyuki; Kihara, Naoto

doi:10.1143/jjap.48.07ga01

Cited by 16 publications

(20 citation statements)

References 30 publications

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“…The total reflectivity changes periodically due to the moving ultrasonic pulse, causing backward diffraction of the probe light. From this oscillation (Brillouin oscillation) frequency, the acoustic-wave speed and the elastic constant are determined [18][19][20]. From the photothermal effect [15], the surface temperature change is proportional to the change in probe light reflectivity, from which we evaluated the thermal conductivity.…”

Section: Methodsmentioning

confidence: 99%

“…From the photothermal effect [15], the surface temperature change is proportional to the change in probe light reflectivity, from which we evaluated the thermal conductivity. The details of our optical system, the calculation of the acoustic-wave speed, and elasticity are shown elsewhere [20][21][22][23]. Just after the excitation, however, the reflectivity change is highly affected by the electron thermalization process, and we adopt a reference sample in this paper to compensate this effect.…”

Section: Methodsmentioning

confidence: 99%

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Phonon propagation in isotopic diamond superlattices

et al. 2021

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The out-of-plane thermal conductivity and elastic constant of epitaxial [100] 12 C/ 13 C superlattice diamonds with layer thicknesses of 1, 30, and 100 nm are evaluated by picosecond ultrasound spectroscopy. The measured elastic constants of the superlattices are equivalent to those of single-layer diamond thin films. This result confirms our success in synthesizing superlattice specimens with few defects at the interfaces. Therefore, the phonon transport behavior is governed by the mass difference, not the interfacial defects. The measured thermal conductivity of the superlattices is lower than that of a pure 12 C isotope diamond thin film. We estimated the lattice thermal conductivity using the lattice dynamics calculation, attributing the lowered thermal conductivity to the decrease in the phonon group velocity in superlattices. We further consider the effect of mini-umklapp scattering in the superlattice, which explains the dependence of the thermal conductivity on the layer thickness. We reveal that the mini-umklapp scattering effect becomes significant only for an isotope diamond superlattice because of the high Debye temperature and large relative mass difference.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Phonon propagation in isotopic diamond superlattices

et al. 2021

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“…For a material with a known refractive index, simple quantitative measurements of the speed of sound are possible. This feature has great potential and it has produced reports in both phononic28 and Brillouin microscopy29 fields.…”

Section: Phonons For Cell Imagingmentioning

confidence: 99%

High resolution 3D imaging of living cells with sub-optical wavelength phonons

Pérez-Cota

Smith

Moradi

et al. 2016

Sci Rep

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Label-free imaging of living cells below the optical diffraction limit poses great challenges for optical microscopy. Biologically relevant structural information remains below the Rayleigh limit and beyond the reach of conventional microscopes. Super-resolution techniques are typically based on the non-linear and stochastic response of fluorescent labels which can be toxic and interfere with cell function. In this paper we present, for the first time, imaging of live cells using sub-optical wavelength phonons. The axial imaging resolution of our system is determined by the acoustic wavelength (λa = λprobe/2n) and not on the NA of the optics allowing sub-optical wavelength acoustic sectioning of samples using the time of flight. The transverse resolution is currently limited to the optical spot size. The contrast mechanism is significantly determined by the mechanical properties of the cells and requires no additional contrast agent, stain or label to image the cell structure. The ability to breach the optical diffraction limit to image living cells acoustically promises to bring a new suite of imaging technologies to bear in answering exigent questions in cell biology and biomedicine.

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“…Thus, these phenomena are utilized for the measurement of material properties such as viscosity, [20][21][22][23][24][25][26][27] and elasticity. [28][29][30][31][32][33][34][35][36][37][38] In addition, wave propagation is associated with various phenomena, including scattering, diffraction, and radiation to another medium. They are investigated for measurements and applications, and for their simulation.…”

Section: Recent Trends In Measurement Techniques In Ultrasonic Electrmentioning

confidence: 99%

“…Therefore, the research related to ultrasonic nonlinearity has been valuable. 82 Ultrasonic properties of materials, phonon physics, acousto-optics Properties of materials viscosity [20][21][22][23][24][25][26][27] elasticity [28][29][30][31][32][33][34][35][36][37][38] Wave propagation [39][40][41][42][43] Waveguides 44) Piezoelectric materials [45][46][47][48][49][50][51][52][53][54] Quantum acoustics 55) Acousto-optics 30,31,34,39,40,[56][57][58][59][60][61][62][63]…”

Section: Transmittermentioning

confidence: 99%

Introduction of measurement techniques in ultrasonic electronics: Basic principles and recent trends

Mizutani¹,

Wakatsuki²,

Ebihara³

2016

Jpn. J. Appl. Phys.

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Measurementthe act of measuring physical properties that we performhas the potential to contribute to the successful advancement of sciences and society. To open doors in physics and other sciences, various measurement methods and related applications have been developed, and ultrasound has remained a useful probe, power source, and interesting measurement object for the past two centuries. In this paper, we first summarize the basic principles of ultrasound from the viewpoint of measurement techniques for readers who just have started studying or are interested in the field of ultrasonic electronics. Moreover, we also introduce recent studiesultrasonic properties of materials, measurement techniques, piezoelectric devices, nonlinear acoustics, biomedical ultrasound, and ocean acousticsand their trends related to measurement techniques in ultrasonic electronics to provide some ideas for related applications.

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Elastic-Constant Measurement in Oxide and Semiconductor Thin Films by Brillouin Oscillations Excited by Picosecond Ultrasound

Cited by 16 publications

References 30 publications

Phonon propagation in isotopic diamond superlattices

Phonon propagation in isotopic diamond superlattices

High resolution 3D imaging of living cells with sub-optical wavelength phonons

Introduction of measurement techniques in ultrasonic electronics: Basic principles and recent trends

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