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Nonlinear Inelastic Light Scattering in a Smectic Liquid Crystal

100%
Pura B., Jęda W., Zagórski A.
Acta Physica Polonica A
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1998
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vol. 93
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issue 3
465-470
EN
Results of measurements of the intensity of light scattered by a smectic liquid crystal are reported for three phases of the specimen. A strong dependence of the scattered intensity on the relative directions of polarization vector and molecular orientation is observed. A mechanism of light interaction with material is proposed, it is attributed to brillouin - like scattering of light on director - system excitations.
2
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Observation of Optical Bistability in Cholesteric Liquid Crystals

100%
Pura B., Gronowska I., Petykiewicz J.
Acta Physica Polonica A
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1997
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vol. 92
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issue 3
527-533
EN
In the paper, some experimental and theoretical results concerning optical bistability in cholesteric liquid crystals are presented. A strong primary laser beam interacted nonlinearly with the material and influenced a second (probe) beam in such a way that its transmitted part exhibited a bistable dependence on the intensity of the first beam. It was observed that such a character may be attributed to the intensity of the outgoing probe wave. The obtained results reflect the symmetry of the sample and are interpreted as second order nonlinearity effects.
3
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Comparison of Ultrafast Photodetectors Based on N^+GaAs and LT GaAs

88%
Białous M., Mogilinski R., Wierzbicki M., Świtkowski K., Pura B.
Acta Physica Polonica A
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2011
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vol. 119
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issue 3
382-386
EN
We present investigation of a photodetector based on nitrogen-ion-implanted GaAs. Device photoresponse signal shows 1.15 ps FWHM (400 GHz, 3 dB bandwidth) with the voltage amplitude ≈ 1 mV, measured using a constructed electro-optic sampling setup with 80 fs width, 795 nm wavelength and laser pulses repetition rate of 80 MHz. Changes in the shape of electrical signal for different beam powers excitation and voltage biases have been demonstrated, compared with LT GaAs photodetector based on the same finger geometry. Using technique of X-ray diffraction and diffuse scattering analyses we have observed the decrease of lattice constant, radius of nanoclusters after implantation, respectively, and linear density dislocations increased over twice.
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