Browsing by Author "Liu, R. C."

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Characterization of doped Bi4Ge3O12 single crystals by light-induced absorption, electrical and photoelectrical measurements
(2007-02-01)
Petrova, D.
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Marinova, V.
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Liu, R. C.
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Lin, S. H.
;
Hsu, K. Y.
Measurement of light-induced absorption changes, dark- and photoconductivity have been performed on Bi4Ge3O12 crystals doped with Fe, Rh and Fe+Rh. All samples exhibited a strong photochromic effect at room temperature, which was fully reversible after thermal annealing. It was found that Rh-doped Bi4Ge3O12 crystals possess a lower dark conductivity (sigma(d) = 5.2 x 10(-14) (Omega.cm)(-1)) at room temperature in comparison with other investigated samples. New centers in the Bi4Ge3O12 inter-band structure, with thermal activation energies between 0.25 and 0.37 eV, have been created by doping with Fe and Rh. Fe-doped and Fe+Rh co-doped samples showed a non-linear photoconductivity dependence on light intensity, under illumination with a 514-nm laser.
Liquid crystal light valve operating at near infrared spectral range
(2016-04)
Marinova, V.
;
Chi, C. H.
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Tong, Z. F.
;
Liu, R. C.
;
Berberova, N.
A near infrared sensitive liquid crystal light valve, based on Ru-doped Bi12TiO20 (BTO:Ru) inorganic crystal and liquid crystal is proposed. The two-beam mixing experiments at Raman-Nath regime show promising gain value at 1064 nm. An image evolution through the proposed device is demonstrated supporting all optical switching property.