Nataliya Berberova-Buhova, Assosiate professor, PhD, nberberova@iomt.bas.bg, 0876663319

2016   PhD student, "Physics of Wave Processes" - Bulgarian Academy of Sciences; Institute of Optical Materials and Technologies (IOMT-BAS), Sofia, Bulgaria

2011   master in “Quantum Electronics and Laser Physics” and “Wireless Networks and Devices”; Faculty of Physics of Sofia University "St. Kliment Ohridski", Sofia

03.2023 - up to now - Assosiate Professor at IOMT-BAS

2016-2023 Assistant professor at IOMT-BAS

2012-2016 Assistant at IOMT-BAS

• Holography, holographic printers, holographic displays, digital image processing;
• Optical metrology – stripe projection profilometry, holographic interferometry, dynamic speckle analysis;
• Polarization holography. Optical recording media. Anisotropic hybrid materials. Birefringence and dichroism. Theoretical modeling of the optical response of systems, scattering by spherical and cylindrical nanoparticles, effective refractive index;

·       scientific publications in Bulgarian and foreign journals , published in editions indexed in WoS and/or Scopus – 40;

·       citations – 102 in publications indexed in WoS and/or Scopus;

·       h-index: 7 (according to data from WoS and Scopus);

1. Head of the project "Mechanism for increasing birefringence in anisotropic media due to the addition of nanoparticles", FNI KP-06-M38/2 (2019-2021);

2. Head of the project "Investigation of the relief formation process during polarization holographic recording", FNI DM 08/1 (2016-2018);

3. Head of the project "Holographic recording of real 3D with object research approach in education", ДСД-15/21.08.2019 (2019-2020);

4. Project manager PROJECT BG051PO001-3.3.05-0001 (CONTRACT: No. Д02-584/10.06.2013 INDEX: МУ-10-11/2013) "Profilometric system for designing sinusoidal stripes with a spatial light module" ("SLM "). -Based Sinusoidal Fringe Projections under Coherent Illumination"), Ministry of Education, Science and Technology Competition for the selection of doctoral students, postdoctoral fellows and young scientists for one-month trainings in high-tech scientific complexes and infrastructures, BG051PO001/3.3-05 "Science and Business", financed by Operational " Development of Human Resources", 2013;

5. Project manager No. BG051PO001-3.3-05/0001 (CONTRACT No. ДО1-4115/17.06.2013 INDEX: П-7-14/2013) "Design of sinusoidal strips with a spatial light modulator in coherent lighting" ("SLM "). -Based Sinusoidal Fringe Projections under Coherent Illumination"), Ministry of Education, Science and Technology Project for support of specialized publications in refereed publications and publications with an impact factor, project No. BG051PO001-3.3-05/0001 under the "Science-Business" scheme, financed by Operational " Development of Human Resources", 2013

Participation in projects:

1. SRA Project Participant - 2019 "Research on Direct Data Acquisition and Compression in Digital Holography", 2019, Institute of Electronics and Telecommunications (Electronics and Telecommunications Research Institute), South Korea (ETRI);

2. SRA Project Participant - 2020 "Research on Polarization Hologram Recording and Dynamic Hologram Quantization", 2020, Institute of Electronics and Telecommunications (Electronics and Telecommunications Research Institute), South Korea (ETRI);

3. Participant in the SRA project - 2021 "Quality improvement in incoherent self-perturbation digital holography, polarization holography and dynamic speckle analysis", 2021, Institute of Electronics and Telecommunications (Electronics and Telecommunications Research Institute), South Korea (ETRI);

4. Participant in the SRA project - 2022 "Coherent acquisition and processing in incoherent digital holography, polarization holography and dynamic speckle metrology", 2022, Institute of Electronics and Telecommunications (Electronics and Telecommunications Research Institute), South Korea (ETRI);

5. Member of the team on the project "Reconfiguring optical elements based on holographic, computer-generated and chiral structures.", FNI КП-06-H38/15 (2019-2022), supervisor: Prof. Lian Nedelchev;

6. Member of the team on the project "New azo materials and application of their photophysical properties as devices for reverse optical recording.", FNI ДН 18/5 (2017-2021), supervisor: Assoc. Dr. Dimana Nazarova;

7. Member of the team on the project "Reversible polarization holographic recording in anisotropic azopolymer nanocomposites", FNI ДН 08/10 (2016-2020), supervisor: Assoc. Dr. Dimana Nazarova;

8. Member of the team on the project "Holographic visualization, formation of light beams and speckle metrology with computer-generated holograms", FNI ДН 08/13 (2016-2020), supervisor: Prof. Elena Stoikova;

9. Member of the team on the project "Development of solid-state dye laser media with high photostability", ДМ18/7 - FNI (2017-2019), head of the chief assistant. Dr. Hristo Kisov

10. Member of the team on the project "New hybrid structures based on photorefractive liquid crystals and graphene", DFNI T02/26, (2015 - 2018), supervisor: Associate Professor Vera Marinova;

11. Member of the team on the project "Development of Optofluidics: Integration of optical control and photonics in microfluidics", DCOST 01/7, COST Co., 2016

12. Member of the project team "Development of test holographic images to popularize the values of Buddhism in our country" - Diamond Road, 2013-2015.

13. Member of the team on the project "High-resolution digital holography - a project for a modern approach to signal processing", Tampere University of Technology - 2014.

OSA, SPIE, EPS

• Photonica Best Poster Prize – third place - V International School and Conference on Photonics – Photonica 2015, August 24 – 28, 2015, Belgrade, Serbia;
• Award for the best article at the International Conference on Digital Presentation and Preservation of Cultural and Scientific Heritage—DiPP2014, September 18-21, 2014, Veliko Tarnovo, Bulgaria;
• Scholar in the competition "For women in science" 2017, topic: "Polarization holographic recording in azopolymer nanocomposites"
• Swiss scholarship - BAS (World Federation of Scientists - Professor A. Zichichi, Switzerland) 12.2015-12.2016

Scientific journals

1.     Stoykova, E., Blagoeva, B., Berberova-Buhova, N., Levchenko, M., Nazarova, D., Nedelchev, L., Park, J.. Intensity-based dynamic speckle method using JPEG and JPEG2000 compression. Applied Optics, 61, 5, OPTICA publishing group (formerly OSA), 2022, ISSN:1559-128X, DOI:https://doi.org/10.1364/AO.444831, B287-B296

2.     Stoykova, E, Levchenko, M, Blagoeva, B, Nazarova, D, Nedelchev, L, Berberova-Buhova, N, Choi, K, Park, J. Environmental Noise Impact on Dynamic Speckle Imaging. Optica Technical Digest Series, DH3D 2022, Optica Publishing Group, 2022, ISBN:978-1-957171-12-8, W1A.3-1-W1A.3-2  

3.     Berberova-Buhova, N., Sharlandjiev, P., Mateev, G., Nedelchev, L., Blagoeva, B., Stoykova, E., Nazarova, D.. Composite thin films of azopolymer and embedded gold nanosized particles: evaluation of the effective complex refractive index. Journal of Chemical Technology and Metallurgy, 57, 2, University of Chemical Technology and Metallurgy, 2022, ISSN:1314-7471, 241-246.

4.     Berberova-Buhova, N., Nedelchev, L., Stoykova, E., Nazarova, D.. Optical response evaluation of azopolymer thin solid films doped with gold nanoparticles with different sizes. Journal of Chemical Technology and Metallurgy, 57, 4, University of Chemical Technology and Metallurgy, 2022, ISSN:1314-7471, 671-675

5.     Stoykova, E., Nazarova, D., Nedelchev, L., Levchenko, M., Berberova-Buhova, N., Ivanov, B.. Normalization in dynamic speckle analysis for non-destructive monitoring of speed of processes. Journal of Physics: Conference Series, 2091, IOP Publishing, 2021, ISSN:1742-6596, DOI:http://dx.doi.org/10.1088/1742-6596/2091/1/012002, 012002-1-012002-8

6.     Stoykova, E., Nazarova, D., Nedelchev, L., Blagoeva, B., Berberova, N., Hong, K., Park, J.. Quantization of dynamic speckle patterns with spatially varying statistics. Applied Optics, 60, 4, Optical Society of America (OSA), 2021, ISSN:1559-128X, DOI:https://doi.org/10.1364/AO.405991, A155-A165

7.     Stoykova, E., Berberova, N., Blagoeva, B., Nazarova, D., Nedelchev, L., Machikhin, A.. Recognition of small areas of activity by the pointwise intensity-based dynamic speckle analysis. Proceedings of SPIE, 11782, SPIE, 2021, ISSN:0277-786X, DOI:10.1117/12.2592600, 117821U-1-117821U-6.

8.     Stoilova, A., Mateev, G., Nazarova, D., Nedelchev, L., Stoykova, E., Blagoeva, B., Berberova, N., Georgieva, S., Todorov, P.. Polarization holographic gratings in PAZO polymer films doped with particles of biometals. Journal of Photochemistry and Photobiology A: Chemistry, 411, Elsevier, 2021, ISSN:1010-6030, DOI:10.1016/j.jphotochem.2021.113196, 113196-1-113196-6.

9.     Nedelchev, L., Mateev, G., Strijkova, V., Salgueiriño, V., Schmool, D., Berberova-Buhova, N., Stoykova, E., Nazarova, D.. Tunable Polarization and Surface Relief Holographic Gratings in Azopolymer Nanocomposites with Incorporated Goethite (α-FeOOH) Nanorods. Photonics, 8, MDPI, 2021, ISSN:2304-6732, DOI:https://doi.org/10.3390/photonics8080306, 306-1-306-12

10.  Mateev, G., Nedelchev, L., Nazarova, D., Blagoeva, B., Berberova, N., Stoykova, E.. Photoinduced chirality in azopolymer based nanocomposites with different TiO2 nanoparticles concentrations. Journal of Physics: Conference Series, 1859, IOP Publishing Ltd., 2021, ISSN:1742-6596, DOI:10.1088/1742-6596/1859/1/012010, 012010-1-012010-5

11.  Blagoeva, B., Nedelchev, L., Nazarova, D., Berberova-Buhova, N., Stoykova, E., Park, J.. Chiral Structures Induced by Elliptically Polarized Light in Amorphous and Liquid Crystalline Azopolymers. OSA Technical Digest, DH-2021, OPTICA publishing group (formerly OSA), 2021, ISBN:978-1-943580-89-7, DOI:https://doi.org/10.1364/DH.2021.DM6E.7, DM6E.7-1-DM6E.7-2  

12.  Blagoeva, B., Berberova, N., Nazarova, D., Nedelchev, L., Mateev, G., Stoykova, E., Otsetova-Dudin, E, Sharlandjiev, P.. Modelling of the diffraction efficiency of surface relief gratings with varying spatial frequencies, height and shape of the relief. Journal of Physics: Conference Series, 1859, IOP Publishing Ltd., 2021, ISSN:1742-6596, DOI:10.1088/1742-6596/1859/1/012003, 012003-1-012003-5

13.  Berberova-Buhova, N., Nedelchev, L., Mateev, G., Stoykova, E., Strijkova, V., Nazarova, D.. Influence of the size of Au nanoparticles on the photoinduced birefringence and diffraction efficiency of polarization holographic gratings in thin films of azopolymer nanocomposites. Optical Materials, 121, Elsevier, 2021, ISSN:0925-3467, DOI:https://doi.org/10.1016/j.optmat.2021.111560, 111560-1-111560-9

14.  Nazarova, D., Mateev, G., Nedelchev, L., Stoykova, E., Blagoeva, B., Berberova, N., Hong, K., Park, J.. Polarization holographic gratings with enhanced parameters recorded in azopolymer based nanocomposite materials. Optik - International Journal for Light and Electron Optics, 226, 2, Elsevier, 2020, ISSN:0030-4026, DOI:https://doi.org/10.1016/j.ijleo.2020.165882, 165882-1-165882-11

15.  Berberova, N, Sharlandjiev, P, Nazarova, D, Nedelchev, L. Optical response of azopolymer (PAZO) layers doped with TiO2 nanoparticles. Proceedings of SPIE, 11047, SPIE, 2019, ISSN:0277-786X, DOI:10.1117/12.2516751, 110470F-1-110470F-4

16.  Stoykova, E, Hoonjong, K, Youngmin, K, Nazarova, D, Nedelchev, L, Ivanov, B, Berberova, N, Mateev, G. Evaluation of activity from binary patterns in dynamic speckle analysis. Optics and Lasers in Engineering, 111, Elsevier, 2018, ISSN:0143-8166, DOI:10.1016/j.optlaseng.2018.07.020, 50-57

17.  Stoykova, E, Blagoeva, B, Nazarova, D, Nedelchev, L, Nikova, T, Berberova, N, Kim, Y, Kang, H. Evaluation of temporal scales of migration of cosmetic ingredients into the human skin by two-dimensional dynamic speckle analysis. Optical and Quantum Electronics, 50, Springer, 2018, ISSN:1572-817X (Online), DOI:10.1007/s11082-018-1440-1, 191-1-191-10

18.  Nedelchev, L, Ivanov, D, Berberova, N, Strijkova, V, Nazarova, D. Polarization holographic gratings with high diffraction efficiency recorded in azopolymer PAZO. Optical and Quantum Electronics, 50, Springer, 2018, ISSN:1572-817X (Online), DOI:10.1007/s11082-018-1479-z, 212-1-212-9

19.  Nazarova, D, Sharlandjiev, P, Berberova, N, Blagoeva, B, Stoykova, E, Nedelchev, L. Diffraction efficiency calculations of polarization diffraction gratings with surface relief. Journal of Physics: Conference Series, 992, IOP Publishing, 2018, ISSN:1742-6596, DOI:10.1088/1742-6596/992/1/012018, 012018-1-012018-5

20.  Mateev, G, Nedelchev, L, Ivanov, D, Tomova, R, Petrova, P, Strijkova, V, Berberova, N, Nazarova, D. Polarization holographic gratings in azopolymer PAZO recorded with different recording beams polarizations. Journal of Physics: Conference Series, 992, IOP Publishing, 2018, ISSN:1742-6596, DOI:10.1088/1742-6596/992/1/012056, 012056-1-012056-5

21.  Berberova, N, Sharlandjiev, P, Stoilova, A, Nedelchev, L, Nazarova, D, Blagoeva, B. Optical constants of azopolymer PAZO thin films in the spectral range 320 – 800 nm. Journal of Physics: Conference Series, 992, IOP Publishing, 2018, ISSN:1742-6596, DOI:10.1088/1742-6596/992/1/012019, 012019-1-012019-5

22.  Stoyкova, E., Mateev, G., Nazarova, D., Berberova, N., Ivanov, B.. Pointwise intensity-based dynamic speckle analysis with binary patterns. Proc. SPIE, 10329, SPIE, 2017, DOI:10.1117/12.2270153, 103293Y

23.  Stoykova, Е, Berberova, N, Nazarova, D, Ivanov, B. SLM-based Testing of Algorithms in Dynamic Speckle Metrology. OSA Technical digest, OSA Publishing,

24.  Stoykova, E, Berberova, N, Kim, Y, Nazarova, D, Ivanov, B, Gotchev, A, Hong, J, Kang, H. Dynamic speckle analysis with smoothed intensity-based activity maps. Optics and Lasers in Engineering, 93, 93, 2017, DOI:10.1016/j.optlaseng.2017.01.012, 55-65.

25.  N. Berberova, D. Daskalova, V. Strijkova, D. Kostadinova, D. Nazarova, L. Nedelchev, E. Stoykova, V. Marinova, C.H. Chi, S.H. Lin, “Polarization holographic recording in thin films of pure azopolymer and azopolymer based hybrid materials”, Optical Materials, 64, 212-216, 2017;

26.  Elena Stoykova, Dimana Nazarova, Nataliya Berberova, Atanas Gotchev, Branimir Ivanov, Georgy Mateev, “Dynamic laser speckle metrology with binarization of speckle patterns”, Proc. of SPIE, 10226,102260R, 2017;

27.  D. Nazarova, L. Nedelchev, D. Ivanov, B. Blagoeva, N. Berberova, E. Stoykova, G. Mateev, D. Kostadinova, “Laser induced optically and thermally reversible birefringence in azopolymers”, Proc. of SPIE, 10226, 1022608, 2017;

28.  L. Nedelchev, D. Nazarova, B. Blagoeva, D. Ivanov, D. Daskalova, N. Berberova, G. Mateev, D. Kostadinova, “Time dependent spectral birefringence excited with laser light in azopolymers and azopolymers doped with ZnO”, Proc. of SPIE, 10226, 1022606, 2017;

29.  Hoonjong Kang, Elena Stoykova, Nataliya Berberova, Jiyong Park, Dimana Nazarova, Joo Sup Park, Youngmin Kim, Branimir Ivanov, Nikola Malinowski, “Three-dimensional imaging of cultural heritage artifacts with holographic printers”, Proc. of SPIE, 10226, 102261I, 2017;

30.  D. Nazarova, E. Stoykova, L. Nedelchev, B. Ivanov, N. Berberova, N. Malinowski, “Monitoring of a drying process in azopolymer water solutions by dynamic speckle detection”, Bulgarian Chemical Communications, 48, Special Issue G, 49-52, 2016;

31.  L. Nedelchev, D. Ivanov, G. Mateev, B. Blagoeva, D. Kostadinova, N. Berberova, D. Nazarova, “Multiple cycles of recording/reading/erasing birefringence in azopolymers”, Bulgarian Chemical Communications, 48, Special Issue G, 33-36, 2016;

32.  P. Sharlandjiev, D. Nazarova, N. Berberova, “Digital Image processing: denoising by adaptive median filtering and wavelet transform”, Bulgarian Chemical Communications, 48, Special Issue G, 33-36, 2016;

33.  P. Sharlandjiev, N. Berberova, D. Nazarova, G. Stoilov, “Phase recovery from fringe patterns with global carriers: approach based on Hilbert transform and wavelet de-noising techniques, Bulgarian Chemical Communications, 48, Special Issue G, 29-32, 2016;

34.  Lian Nedelchev, Dimana Nazarova, Nataliya Berberova, Georgi Mateev, Desislava Kostadinova, Rosalía Mariño-Fernández, Verónica Salgueiriño and David Schmool, “Enhanced photoanisotropic response in azopolymer doped with elongated goethite nanoparticles”, Journal of Physics: Conference Series (JPCS) 700 (1), 012031, 2016;

35.  Nataliya Berberova, Dimana Nazarova, Lian Nedelchev, Blaga Blagoeva, Desislava Kostadinova, Vera Marinova, Elena Stoykova, “Photoinduced variation of the Stokes parameters of light passing through thin films of azopolymer based hybrid organic/inorganic materials”, Journal of Physics: Conference Series (JPCS), 700, 012032, 2016;

36.  V. Marinova, C. H. Chi sub>, Z. F. Tong, N. Berberova, R. C. Liu, S. H. Lin,Y. H. Lin, sup> E. Stoykova and K. Y. Hsu, “Liquid crystal light valve operating at near infrared spectral range”, Optical and Quantum Electronics (Springer), 48 (4), 1-6, 2016;

37.  E. Stoykova, N. Berberova, D. Nazarova, A. Gotchev, “Intensity-based pointwise processing in dynamic laser speckle analysis”, IEEE 11 sup>th conference Lasers and Electro-Optics Pasific Rim (CLEO-PR), 2, 1-2, 2015;

38.  Elena Stoykova, Dimana Nazarova, Natalia Berberova, Atanas Gotchev, “Performance of intensity – based non- normalized pointwise algorithms in dynamic speckle analysis”, Optics Express 23 (19):25128-25142, doi: 10.1364/OE.23.025128, 2015;

39.  Elena Stoykova, Natalia Berberova, T. Nikova, “Dynamic laser speckle measurement with enhanced visualization of activity map”, Proc. SPIE, Proc. SPIE 9447, doi:10.1117/12.2176147, 2015;

40.  Lian Nedelchev, Dimana Nazarova, Georgi Mateev, Nataliya Berberova,“Birefringence induced in azopolymer (PAZO) films with different thickness”, Proc. SPIE 9447, 18th International School on Quantum Electronics: Laser Physics and Applications, 94471I; doi:10.1117/12.2176158, 2015;

41.  N.Berberova, E.Stoykova, B. Ivanov, “SLM-based optical simulator for dynamic speckle analysis”, Proc. SPIE 9286, Second International Conference on Applications of Optics and Photonics, 928654, doi:10.1117/12.2063631, 2014;   

42.  N.Berberova, E. Stoykova, H. Kang, J. S. Park, B. Ivanov, “SLM- based sinusoidal fringe projection under coherent illumination”, Optics Commun. 304, 116- 122, ISSN: 0030-4018, 2013;

43.  B. Ivanov, E. Stoykova, N. Berberova, T. Nikova, E. Krumov, N. Malinowski, “ Dynamic speckle technique as a leaf contamination sensor,” Bulg. Chem.Commun. 45, Special Issue B (pp. 149-153), 2013;

44.  E. Stoykova, N. Berberova, J.S. Park, H. Kang, V. Sainov, “Pattern projection profilometry with sinusoidal gratings under coherent illumination”, 3D Research Springer 04 (01) 5, ISSN: 2092-6731, 2013;

45.  N. Berberova, E. Stoykova, J.S. Park, H. Kang, V. Sainov, “Speckle suppression in pattern projection profilometry with a thin sinusoidal grating by polychromatic illumination”, Proc. SPIE 8770, 17th Intl. School on Quantum Electronics: Laser Physics and Applications, 87700R (March 15, 2013);  doi: 10.1117/12.2013646;

46.  D. Nazarova, L. Nedelchev, V.Dragostinova, N. Berberova, “ Influence of the size of nanoparticles doped in series of azopolymers of the photoinduced birefringence”, Proc. SPIE 8770, 17th International School on Quantum Electronics: Laser Physics and Applications, 877009 (March 15, 2013);  doi: 10.1117/12.2013646;

47.  N.Berberova, E. Stoykova and V. Sainov, “Generation of sinusoidal fringes with a holographic phase grating and a phase-only spatial light modulator”, Phys. Scr. T149, 014020 (4pp), IOP publishing: doi:10.1088/0031-8949/2012/T149/014020, 2012;

48.  E.Stoykova, B. Ivanov, N. Berberova, T. Nikova, “Pointwise implementation of dynamic speckle metrology”, Proc. of Optical Society of Korea Summer annual meeting 2014,M1D-III2, 109-110 (2014);

49.  H. Kang, E. Stoykova, N. Berberova, J.Park, S. Hong, Y.Kim, J.-S. Park, B. Ivanov, D. Nazarova, N. Malinowski, “Digital Holographic Printing Methods for 3D Visualization of Cultural Heritage Artifacts”, R. Pavlov and P.Stanchev (Eds.), Digital Presentation and Preservation of Cultural and Scientific Heritage International Conference,Proceedings vol. 4. 69-78, (2014); ISSN:1314-4006 (Print);

50.   P.Sharlandjiev, D. Nazarova, N. Berberova, “Digital Image Denoising by Adaptive Median Filtering and Wavelet Transform”, R. Pavlov and P.Stanchev (Eds.), Digital Presentation and Preservation of Cultural and Scientific Heritage International Conference,Proceedings vol. 4. 213-217, (2014); ISSN:1314-4006 (Print);

51.  E. Stoykova, H. Kang, N. Berberova, B. Ivanov, and S. Woo, “Using LED Illumination in Fringe Projection Profilometry with a Sinusoidal Phase Grating”, W. Osten(ed.), Fringe 2013, 835-838, (Springer 2013), SBN: 978-3-642-36358-0 (Print), 978-3-642-36359-7 (Online);

52.  N.Berberova, E. Stoykova, H.Kang, J.-S. Park, B. Ivanov, “SLM- based fringe projection under coherent illumination,” W. Osten (ed.), Fringe 2013, 883-886, (Springer 2013), SBN: 978-3-642-36358-0 (Print), 978-3-642-36359-7 (Online);

53.  E. Stoykova, N. Berberova, H. Kang, and V. Sainov, "Sinusoidal Phase Grating as a Diffractive Optical Element for Profilometry," in Digital Holography and Three-Dimensional Imaging, OSA Technical Digest (online) (Optical Society of America, 2013), paper DW3A.2.;

54.  E. Stoykova, A. Baldjiev, B. Ivanov, N. Berberova, V. Sainov, „Holographic and optical elements for shape and displacement measurement”, Proc. of Optical Society of Korea Winter annual meeting 2012, T2C-III1 (invited lecture), 133-134 (2012);

55.  E. Stoykova, N. Berberova, S.S. Woo, H. Kang, V. Sainov, „SLM-based phase-measuring profilometry under coherent illumination”, Proc. of Optical Society of Korea Summer annual meeting 2012, T2C-III2, 285-286 (2012);