Dr. Yuri Gritsai Profile

Dr. Yuri Gritsai

at SeeReal Technologies GmbH

SPIE Involvement:

Author

Publications (8)

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

Read Abstract +

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

Read Abstract +

Proceedings Article | 31 July 2007 Paper

Polymeric material for phase and phase-relief recording with enhancement and sensitivity in UV region

Yuri Gritsai, Uladzimir Mahilny

Proceedings Volume 6728, 67283I (2007) https://doi.org/10.1117/12.752475

KEYWORDS: Diffusion, Polymers, Modulation, Phase shift keying, Refractive index, Diffraction gratings, Glasses, Holography, Diffraction, Ultraviolet radiation

Read Abstract +

Proceedings Article | 3 September 2003 Paper

Resolution improvement of surface photorelief recording

Vladzimir Mahilny, Yuri Gritsai, Aliaksandr Stankevich, Aleksei Tolstik, Lutz Wenke

Proceedings Volume 5135, (2003) https://doi.org/10.1117/12.518102

KEYWORDS: Annealing, Aluminum, Polymers, Diffraction gratings, Holography, Pulsed laser operation, Modulation, Diffraction, Diffusion, Optical resolution

Read Abstract +