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Marinova V.,Institute of Optical Materials and Technologies | Marinova V.,National Chiao Tung University | Tomov V.,Bulgarian Academy of Science | Chuang C.I.,National Chiao Tung University | And 6 more authors.
Bulgarian Chemical Communications | Year: 2013

Strontium borate glasses SrB4O7 doped with Sm ions are prepared by conventional melting-quenching method. The effect of γ-ray irradiation on the glass samples is studied by measuring the absorption spectra and the photoluminescence. It is found that the γ-ray irradiation caused partial reduction of Sm3+ to Sm2+ at room temperature. Borate framework is supposed to be responsible for the Sm3+ to Sm2+ transition. © 2013 Bulgarian Academy of Sciences, Union of Chemists in Bulgaria. Source


Marinova V.,National Chiao Tung University | Marinova V.,Institute of Optical Materials and Technologies | Liu R.C.,National Chiao Tung University | Chen M.S.,National Chiao Tung University | And 3 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

A light-valve device, assembled by Ru-doped Bi12SiO20 (BSO) photoconductive substrate and polymer dispersed liquid crystal layer is proposed, in which all the processes are controlled by the near infrared light. Laser beam illumination (Gaussian shape) on BSO:Ru crystal caused charge carriers generation, which migrate and form an inhomogeneous distribution and subsequent space charge field. This surface-localized electromagnetic field penetrates into the PDLC layer and modulate the orientation of the liquid crystals, that caused reverse of the device initial opaque state to the highly transparent one. The proposed structure is simple and easy to fabricate, without requirements of ITO contacts and alignment layers and opens further possibilities for near-infrared applications. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only. Source


Dimitrov D.Z.,Institute of Optical Materials and Technologies
Bulgarian Chemical Communications | Year: 2013

Silicon nanostructures are attractive for optics and optoelectronics application to provide more efficient light absorption. Most common processes for formation of silicon surface nanostructures are rather expensive and require high temperatures, high vacuum and hazardous precursors. The silver nanoparticles assisted electroless etching process is a simple and cheap method for preparation of nanostructured silicon surfaces. The silver nanoparticles are deposited in-situ by electroless deposition from non- HF (Hydrofluoric acid) containing solution of activated persulfate. Silicon is selectively etched in HF based solutions with the help of silver nanoparticles. Both the etch process and the deposition of silver particles are studied. The experimental observations are used to get more insight into the etching mechanism. © 2013 Bulgarian Academy of Sciences, Union of Chemists in Bulgaria. Source


Dimitrov D.,Institute of Optical Materials and Technologies | Marinova V.,Institute of Optical Materials and Technologies | Tomov V.,Bulgarian Academy of Science | Rafailov P.,Bulgarian Academy of Science | Gospodinov M.,Bulgarian Academy of Science
Bulgarian Chemical Communications | Year: 2013

Topological insulator single crystals of Bi2(SexTe 1-x)3 and doped Bi2Se3 are prepared by modified Bridgman technique. The crystals are with high quality as confirmed by XRD and Raman spectroscopy measurements. These new materials are of great importance for the research on devices and technologies based on topological insulator properties. © 2013 Bulgarian Academy of Sciences, Union of Chemists in Bulgaria. Source


Kim Y.,Korea Electronics Technology Institute | Stoykova E.,Korea Electronics Technology Institute | Stoykova E.,Institute of Optical Materials and Technologies | Kang H.,Korea Electronics Technology Institute | And 3 more authors.
Optics Express | Year: 2015

The holographic wavefront printer decodes the wavefront coming from a three-dimensional object from a computer generated hologram displayed on a spatial light modulator. By recording this wavefront as an analog volume hologram this printing method is highly suitable for realistic color 3D imaging. We propose in the paper spatial partitioning of the spatial light modulator to perform mosaic delivery of exposures at primary colors for seamless reconstruction of a white light viewable color hologram. The method is verified for a 3 × 3 color partitioning scheme by a wavefront printer with demagnification of the light beam diffracted from the modulator. © 2015 Optical Society of America. Source

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