Dr. Oksana V. Sakhno Profile

Dr. Oksana V. Sakhno

at Fraunhofer-IAP

SPIE Involvement:

Conference Program Committee | Author

Proceedings Article | 21 May 2018 Presentation + Paper

Bragg polarization gratings used as switchable elements in AR/VR holographic displays

Oksana Sakhno, Yuri Gritsai, Hagen Sahm, Joachim Stumpe, Michael Wegener

Proceedings Volume 10676, 106760F (2018) https://doi.org/10.1117/12.2309788

KEYWORDS: Polarization, Diffraction, Diffraction gratings, Holography, Switching, Polymers, Liquid crystals, Digital holography

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The high coherence of laser light sources is a key to the application of diffractive optics usable in holographic AR/VR displays. This can be combined with switchable diffractive elements, which are advantageous for several optical functions used in immersive holographic displays such as shutters, polarization filters, for rapid beam deflection and selection. We demonstrate a compact, effective and robust diffraction wide-angle switchable beam-deflecting device based on circular polarization gratings possessing Bragg-performances (Bragg-PG) and a polarization switch. Such grating/polarization switch pair may, for instance, be a discrete switchable deflection element or as a switching element for pre-deflection with field lenses for application in holographic AR/VR displays. Micrometer-thick circular polarization gratings characterized by high diffraction efficiency (DE > 95%), large diffraction angles (< 30°) and wide angular and wavelength acceptance were developed. In the presented embodiment, the output signal is controlled between the zero- and first-diffraction orders by the handedness of circular polarization of the incident light. Forming a stack of two such oppositely aligned gratings can double the deflection angle. These gratings are the result of a two-step photochemichal/thermal processing procedure of a photocrosslinkable liquid crystalline polymer (LCP). The holographic patterning provides a high spatial resolution (period < 700 nm) and the arbitrary orientation of the LC director as well as high optical quality and thermal and chemical stability of the final gratings. Highly efficient (diffraction efficiency, DE > 95% in the vis spectral range) and stable symmetric and slanted circular Bragg polarization gratings were fabricated using the developed material and processing technique. The high usable diffraction angles combined with high DE make the Bragg-PG attractive for HMD AR/VR applications because of the system inherent short focus lengths and large numerical apertures needed to meet the low space budget in HMD and other optical systems.

Proceedings Article | 14 May 2010 Paper

All-optical fabrication of 2D and 3D photonic microstructures in polymeric materials

Yuri Gritsai, Leonid Goldenberg, Olga Kulikovska, Oksana Sakhno, Joachim Stumpe

Proceedings Volume 7716, 77161V (2010) https://doi.org/10.1117/12.853811

KEYWORDS: Diffraction, Photomasks, Diffraction gratings, Polymers, Holography, Polarization, Holographic materials, Refractive index, Modulation, Nanocomposites

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Proceedings Article | 25 September 2009 Paper

Holographic patterning of organic-inorganic photopolymerizable nanocomposites

Oksana Sakhno, Leonid Goldenberg, Tatiana Smirnova, J. Stumpe

Proceedings Volume 7487, 74870H (2009) https://doi.org/10.1117/12.846463

KEYWORDS: Holography, Nanocomposites, Polymers, Diffraction gratings, Composites, Diffraction, Metals, Silver, Gold, Titanium dioxide

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Proceedings Article | 26 October 2004 Paper

POLIPHEM: new type of nanoscale polymer-LC-switchable photonic devices

Oksana Sakhno, Sergey Slussarenko, Joachim Stumpe

Proceedings Volume 5521, (2004) https://doi.org/10.1117/12.566074

KEYWORDS: Polymers, Diffraction gratings, Holography, Liquid crystals, Diffraction, Electro optics, Refractive index, Photopolymerization, Anisotropy, Modulation

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Proceedings Article | 15 December 2000 Paper

Holographic recording in thick photopolymer films

Tatiana Smirnova, Oksana Sakhno

Proceedings Volume 4087, (2000) https://doi.org/10.1117/12.406297

KEYWORDS: Holography, Diffraction gratings, Holograms, Diffraction, Volume holography, Modulation, Data storage, Adaptive optics, Holographic optical elements, Scattering

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Proceedings Article | 3 October 2000 Paper

PPC: self-developing photopolymers for holographic recording

Tatiana Smirnova, Oksana Sakhno

Proceedings Volume 4149, (2000) https://doi.org/10.1117/12.402466

KEYWORDS: Holography, Polymers, Holograms, Diffraction gratings, Photopolymers, Holographic optical elements, Refractive index, Thermodynamics, Polymerization, Diffraction

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Proceedings Article | 14 June 2000 Paper

Self-processing photopolymers for holographic recording in spectral range 500 to 700 nm

Tatiana Smirnova, Oksana Sakhno, Eugene Tikhonov, V. Shibanov, Pavel Ezhov

Proceedings Volume 4148, (2000) https://doi.org/10.1117/12.388445

KEYWORDS: Holography, Photopolymers, Holograms, Visible radiation, Polymerization, Optical components, Lenses, Optical filters, Optical pattern recognition, Composites

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Proceedings Article | 23 September 1998 Paper

Kinetic peculiarities of holographic recording in photopolymers

Tatiana Smirnova, Oksana Sakhno

Proceedings Volume 3488, (1998) https://doi.org/10.1117/12.323717

KEYWORDS: Holography, Polymers, Photopolymers, Polymerization, Holographic materials, Refractive index, Photorefractive polymers, Diffusion, Holograms, Picosecond phenomena

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Proceedings Article | 20 April 1998 Paper

Temperature behavior and the optical damage threshold of holographic gratings based on photopolymerizable materials

Oksana Sakhno, Tatiana Smirnova, Eugene Tikhonov

Proceedings Volume 3359, (1998) https://doi.org/10.1117/12.306268

KEYWORDS: Polymers, Holography, Laser damage threshold, Temperature metrology, Diffraction gratings, Holograms, Refractive index, Holographic optical elements, Diffraction, Modulation

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Showing 5 of 9 publications

Conference Committee Involvement (3)

Photosensitive Materials and their Applications III

8 April 2024 | Strasbourg, France

Photosensitive Materials and their Applications II

5 April 2022 | Strasbourg, France

Photosensitive Materials and their Applications

6 April 2020 | Online Only, France

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