Transient reflecting grating for sub-surface analysis: GHz ultrasonic and thermal spectroscopies and imaging

Sawada, Tsuguo; Harata, Akira

doi:10.1007/bf01538191

Cited by 16 publications

(11 citation statements)

References 30 publications

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“…In addition to the report, we found from diffraction theory considerations that the refractive index modulation was a minor component of the signal. 31,42 Therefore, we can see that the TRG oscillations in the surface signal consist of the modulation of the surface deformation as the main component and that of the refractive index as the minor component, both of which are induced by acoustic waves localized near the surface. The oscillating signal contains information in the ⌳/2 region from the surface, that is, 1 m in this case, because the acoustic waves which causes the surface displacement are localized in the surface region of the waves' half-wavelength.…”

Section: Resultsmentioning

confidence: 97%

“…[22][23][24][25][26][27][28][29][30][31][32][33] Two temporally coincident laser pulses ͑pump pulses͒ with the same wavelength produce optical interference fringes on and under the sample surface. These optical fringes cause spatial modulations of the refractive index and surface displacement.…”

Section: Principlementioning

confidence: 99%

“…Elastic and thermal properties of thin films and multilayer thin films were estimated by this technique. [29][30][31][32][33] Some chemical or physical applications were also made for measurements of ultrafast carrier dynamics. [34][35][36][37][38] This method has advantages of providing noncontact, nondestructive, and interface-selective measurements, and high temporal resolution.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Generation and observation of GHz ultrasonic waves on liquid surfaces and a liquid/liquid interface by transient reflecting grating method

Ikeda

Katayama

Tanaka

et al. 1999

The Journal of Chemical Physics

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We optically generated and observed GHz ultrasonic waves on liquid surfaces and a liquid/liquid interface for the first time using the transient reflecting grating (TRG) method. Four kinds of samples were used for measurement of the surfaces; two types of black ink, an aqueous solution of crystal violet (CV aq solution) and ethanol aqueous solutions of CV. A cyclohexane/CV aq solution interface was used for measurement of the liquid/liquid interface. The 0.7 GHz and 0.6 GHz ultrasonic waves were generated on the liquid surfaces and the liquid/liquid interface, respectively. These ultrasonic waves resemble longitudinal acoustic waves partly localized at the surface, and they cause surface displacement. The amplitudes of TRG signals from surfaces of the CV mixed solvent solutions were found to be greatly affected by both the viscosity and surface tension. This result indicated the viscosity and interface tension must be considered as perturbations in the elastic theory. The strong dependence on interface tension showed the high selectivity of the TRG signals for the interface.

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Section: Resultsmentioning

confidence: 97%

Section: Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Generation and observation of GHz ultrasonic waves on liquid surfaces and a liquid/liquid interface by transient reflecting grating method

Ikeda

Katayama

Tanaka

et al. 1999

The Journal of Chemical Physics

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“…Impulsive stimulated thermal scattering, has been used extensively in a transient grating configuration in transmission and reflection modes to examine acoustic waves in roughly the 10 MHz-10 GHz frequency range. [1][2][3][4] For the case of an opaque thin-film sample, two excitation pulses are crossed to produce an optical interference pattern with fringe spacing ⌳. Optical absorption and sudden heating at the interference maxima ͑the transient grating ''peaks''͒ gives rise to thermal expansion which launches acoustic waves of wavelength ⌳ that propagate in the plane of the film.…”

Section: Transient Grating Measurements Of Picosecond Acoustic Pulsesmentioning

confidence: 99%

Transient grating measurements of picosecond acoustic pulses in metal films

Crimmins

Maznev

Nelson

1999

Applied Physics Letters

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“…We have also used the TRG method to generate and detect the surface acoustic wave ͑SAW͒ of over GHz frequency that is applicable to determination of the elastic property of the surface. [16][17][18] In our previous paper, 19 we reported on TRG signal enhancement under an SPR condition for the Kretschmann configuration. Under SPR with the pump beams, we observed a signal intensity 11 times larger than that under a nonresonant condition, which we attributed to high conversion efficiency from light to heat.…”

Section: Introductionmentioning

confidence: 96%

Detection of photoinduced electronic, thermal, and acoustic dynamics of gold film using a transient reflecting grating method under three types of surface plasmon resonance conditions

et al. 1998

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Mechanisms of unusual signal enhancement observed for transient reflecting grating ͑TRG͒ experiments are investigated under three types of surface plasmon resonance ͑SPR͒ conditions, where two pump beams only, a probe beam only, or two pump beams and a probe beam, excite surface plasmon. A gold thin film deposited on a glass prism is measured in the Kretschmann configuration with a temporal resolution of tens of picoseconds. The signal under each SPR condition exhibits different characteristic features in signal intensity and transient behavior unlike the usual non-SPR TRG experiments. Under SPR with pump beams, high conversion efficiency from light to heat allows detection of a TRG signal 11 times larger in magnitude and much lower in background level than under a non-SPR with them. Under SPR with the probe beam, diffraction caused by heat-induced spatial modulation as described by complex reflection Fresnel coefficients is theoretically proved to enhance the TRG signal and to change transient behavior, which provides a way to get selective observation of heat diffusion near the surface. When both pump and probe beams excite surface plasmons, an additional signal is observed, almost at the same time as the optical pulse, having 100 times larger intensity than the other signals, which is due to electrons excited at the gold surface.

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Transient reflecting grating for sub-surface analysis: GHz ultrasonic and thermal spectroscopies and imaging

Cited by 16 publications

References 30 publications

Generation and observation of GHz ultrasonic waves on liquid surfaces and a liquid/liquid interface by transient reflecting grating method

Generation and observation of GHz ultrasonic waves on liquid surfaces and a liquid/liquid interface by transient reflecting grating method

Transient grating measurements of picosecond acoustic pulses in metal films

Detection of photoinduced electronic, thermal, and acoustic dynamics of gold film using a transient reflecting grating method under three types of surface plasmon resonance conditions

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