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Acousto-Optic Diffraction by Shear Horizontal Surface Acoustic Waves in 36° Rotated Y-Cut X-Propagation Lithium Tantalate

100%

Rimeika R., Čiplys D., Shur M.

We have investigated the acousto-optic diffraction by shear horizontal surface acoustic waves in 36° rotated Y-cut X-propagation lithium tantalate (LiTaO_{{3}}) crystals. The measurements were performed at the optical wavelength 633 nm of He-Ne laser and acoustic wavelengths of 50-60 μ m. The anisotropic diffraction with the light polarization rotation in the transmission mode was observed. The measured and calculated values of the light incidence angle corresponding to the strongest diffraction differed significantly. A narrow strip of a thin metal film deposited on the crystal surface drastically affected the light diffraction. We attribute these effects to the conversion processes between the shear horizontal leaky surface acoustic wave and shear horizontal surface skimming bulk wave.

Investigation of a GaN-Based SAW Oscillator with respect to UV Illumination and Temperature

64%

Miškinis R., Jokubauskis D., Urba E., Smirnov D., Gaidamovičiūtė L., Mikalauskas K., Sereika A., Rimeika R., Čiplys D.

Acta Physica Polonica A

2015

vol. 127

issue 1

90-92

Oscillation frequency of a GaN-based surface acoustic wave delay-line oscillator is investigated in the temperature range from -20°C to +38°C, with and without UV illumination. The results imply that such an oscillator may be used for temperature sensing with the resolution of up to 1 mK. On the other hand, as the frequency downshift due to UV illumination does not exhibit a significant dependence on temperature, it may be expected that such a system, when used as a UV sensor, would not require applying a correction for temperature.

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2 Acta Physica Polonica A

2 2015

2 Rimeika R.

2 Čiplys D.

1 Gaidamovičiūtė L.

1 Jokubauskis D.

1 Mikalauskas K.

1 Miškinis R.

1 Sereika A.

1 Shur M.

1 Smirnov D.

1 Urba E.

Search results

Acousto-Optic Diffraction by Shear Horizontal Surface Acoustic Waves in 36° Rotated Y-Cut X-Propagation Lithium Tantalate

Investigation of a GaN-Based SAW Oscillator with respect to UV Illumination and Temperature