Prof. Lian Nedelchev Profile

Prof. Lian Nedelchev

Professor at IOMT - BAS

SPIE Involvement:

Author

Area of Expertise:

Polarization holography , Photoinduced anisotropy , Azopolymers , Polarimetry (optical) , Nanocomposites (in optics)

Proceedings Article | 15 August 2023 Poster + Paper

Intensity-based dynamic speckle method for analysis of variable-rate dynamic events

Elena Stoykova, Lian Nedelchev, Blaga Blagoeva, Branimir Ivanov, Mikhail Levchenko, Nataliya Berberova-Buhova, Dimana Nazarova

Proceedings Volume 12618, 1261829 (2023) https://doi.org/10.1117/12.2673462

KEYWORDS: Image segmentation, Speckle, Speckle pattern, Spatial light modulators, Polymers, Phase distribution, Light sources and illumination, Optical sensors, Computer simulations, Complex amplitude

Read Abstract +

Proceedings Article | 20 June 2021 Poster + Presentation + Paper

Recognition of small areas of activity by the pointwise intensity-based dynamic speckle analysis

E. Stoykova, N. Berberova, B. Blagoeva, D. Nazarova, L. Nedelchev, A. Machikhin

Proceedings Volume 11782, 117821U (2021) https://doi.org/10.1117/12.2592600

KEYWORDS: Speckle, Speckle pattern, Speckle analysis, Temporal resolution, Wave propagation, Visualization, Sensors, Reliability, Refractive index, Polymers

Read Abstract +

Proceedings Article | 1 April 2020 Open Access

Diffraction efficiency of polarization holographic gratings recorded in azopolymer thin films coated using different solvents

Blaga Blagoeva, Lian Nedelchev, Georgi Mateev, Elena Stoykova, Dimana Nazarova

Proceedings Volume 11367, 113671G (2020) https://doi.org/10.1117/12.2555756

KEYWORDS: Polarization, Diffraction, Diffraction gratings, Thin films, Holography, Birefringence, Surface properties

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 18 December 2019 Paper

Dynamic speckle analysis with two-wavelength acquisition

E. Stoykova, G. Mateev, B. Blagoeva, B. Ivanov, D. Nazarova, L. Nedelchev

Proceedings Volume 11338, 113383M (2019) https://doi.org/10.1117/12.2548141

KEYWORDS: Speckle pattern, Cameras, Speckle, Speckle analysis, Data acquisition, Fourier transforms, Statistical analysis, Correlation function, Content addressable memory, Data processing

Read Abstract +

Proceedings Article | 3 October 2019 Paper

Temperature dependence of the drying process in polymer solutions observed by dynamic speckle detection

E. Stoykova, B. Blagoeva, L. Nedelchev, D. Nazarova

Proceedings Volume 11207, 112071S (2019) https://doi.org/10.1117/12.2527432

KEYWORDS: Speckle pattern, Polymers, Speckle, Thin films, Speckle analysis, Surface roughness, Binary data, Polymer thin films, Glasses, Polarization

Read Abstract +

Proceedings Article | 22 July 2019 Paper

Tissue polarimetric study I: In search of reference parameters and depolarizing Mueller matrix model of ex vivo colon samples

Deyan Ivanov, Razvigor Ossikovski, Tatiana Novikova, Pengcheng Li, Ekaterina Borisova, Tsanislava Genova, Lian Nedelchev, Dimana Nazarova

Proceedings Volume 11075, 1107514 (2019) https://doi.org/10.1117/12.2526594

KEYWORDS: Tissues, Polarimetry, Tissue optics, Colon, Polarization, Tumors, Light scattering, Monte Carlo methods, Diagnostics, Scattering

Read Abstract +

Proceedings Article | 29 January 2019 Paper

Optical response of azopolymer (PAZO) layers doped with TiO2 nanoparticles

Nataliya Berberova, Peter Sharlandjiev, Dimana Nazarova, Lian Nedelchev

Proceedings Volume 11047, 110470F (2019) https://doi.org/10.1117/12.2516751

KEYWORDS: Particles, Scattering, Light scattering, Optical spheres, Refractive index, Nanoparticles, Composites, Dielectric polarization, Birefringence, Holography

Read Abstract +

Proceedings Article | 29 January 2019 Paper

Monitoring of a drying process in polymer water and methanol solutions by dynamic speckle metrology

E. Stoykova, B. Blagoeva, T. Nikova, D. Nazarova, L. Nedelchev

Proceedings Volume 11047, 110470W (2019) https://doi.org/10.1117/12.2516355

KEYWORDS: Polymers, Speckle pattern, Speckle, Speckle metrology, Binary data, Correlation function, Speckle analysis, Statistical analysis, Image processing

Read Abstract +

Proceedings Article | 29 January 2019 Paper

Multiwavelength polarimetry of gastrointestinal ex vivo tissues for tumor diagnostic improvement

Deyan Ivanov, Tsanislava Genova-Hristova, Ekaterina Borisova, Lian Nedelchev, Dimana Nazarova

Proceedings Volume 11047, 1104707 (2019) https://doi.org/10.1117/12.2516645

KEYWORDS: Tissues, Tumors, Polarimetry, Polarization, Diagnostics, Tissue optics, Light scattering, Colon, Statistical analysis, Biomedical optics

Read Abstract +

Proceedings Article | 5 January 2017 Paper

Laser induced optically and thermally reversible birefringence in azopolymers

D. Nazarova, L. Nedelchev, D. Ivanov, B. Blagoeva, N. Berberova, E. Stoykova, G. Mateev, D. Kostadinova

Proceedings Volume 10226, 1022608 (2017) https://doi.org/10.1117/12.2262357

KEYWORDS: Birefringence, Polymers, Polarization, Thermography, Laser optics, Anisotropy, Chromophores, Thin films, Holographic materials, Holography

Read Abstract +

Proceedings Article | 5 January 2017 Paper

Time dependent spectral birefringence excited with laser light in azopolymers and azopolymers doped with ZnO

L. Nedelchev, D. Nazarova, B. Blagoeva, D. Ivanov, D. Daskalova, N. Berberova, G. Mateev, D. Kostadinova

Proceedings Volume 10226, 1022606 (2017) https://doi.org/10.1117/12.2262608

KEYWORDS: Birefringence, Zinc oxide, Absorbance, Nanoparticles, Nanocomposites, Polarization, Polarizers, Transmittance, Thin films, Spectroscopy

Read Abstract +

Proceedings Article | 8 January 2015 Paper

Birefringence induced in azopolymer (PAZO) films with different thickness

Lian Nedelchev, Dimana Nazarova, Georgi Mateev, Nataliya Berberova

Proceedings Volume 9447, 94471I (2015) https://doi.org/10.1117/12.2176158

KEYWORDS: Birefringence, Polymers, Absorbance, Laser beam diagnostics, Thin films, Sodium, Polarimetry, Anisotropy, Polarization, Absorption

Read Abstract +

Proceedings Article | 15 March 2013 Paper

Influence of the size of nanoparticles doped in series of azopolymers on the photoinduced birefringence

Dimana Nazarova, Lian Nedelchev, Violeta Dragostinova, Nataliya Berberova

Proceedings Volume 8770, 877009 (2013) https://doi.org/10.1117/12.2013646

KEYWORDS: Birefringence, Nanoparticles, Neptunium, Zinc oxide, Polymers, Nanocomposites, Doping, Absorbance, Polarimetry, Scattering

Read Abstract +

Proceedings Article | 22 April 2005 Paper

Polarization multiplexing of holograms in azopolymer films

Lian Nedelchev, Detelina Ilieva, Tzveta Petrova, Natalia Tomova, Violeta Dragostinova, Ludmila Nikolova

Proceedings Volume 5830, (2005) https://doi.org/10.1117/12.618409

KEYWORDS: Polarization, Holograms, Multiplexing, Polymers, Diffraction gratings, Diffraction, Picosecond phenomena, Beam splitters, Prisms, Spatial frequencies

Read Abstract +

Proceedings Article | 9 April 2001 Paper

Characteristics of high-efficiency polarization holographic gratings

L. Nedelchev, Todor Todorov, Ludmila Nikolova, Tsveta Petrova, Natalia Tomova, Violeta Dragostinova

Proceedings Volume 4397, (2001) https://doi.org/10.1117/12.425161

KEYWORDS: Polarization, Diffraction, Modulation, Holography, Diffraction gratings, Polarimetry, Optical components, Jones vectors, Refractive index, Polymers

Read Abstract +

Showing 5 of 15 publications

Conference Committee Involvement (1)

Holography: Advances and Modern Trends IX

7 April 2025 | Prague, Czech Republic

Keywords/Phrases

Search In:

Publication Years