Study of a liquid crystal impregnated diffraction grating for active waveguide addressing

Colard, Matthias; Racine, B.; Meunier-Della-Gatta, Sylvia; Grosso, David; Kerzabi, Badre; Millard, Kyllian; Lee, Yann; Shum, A. N.; Haeberlé, Olivier; Martinez, Christophe

doi:10.1117/12.2607475

Cited by 7 publications

(4 citation statements)

References 14 publications

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“…These µ-displays do not allow for control over the emission properties, resulting in low power efficiency in the AR system, or a limited EyeBox (EB) and Field of View (FoV). This paper introduces an innovative display concept that uses photonic integrated circuits (PICs) in the visible range [8], [9], combined with active light extraction components using liquid crystals [10], [11] and pixelated holograms [12], [13]. This new approach aims to offer a more flexible integration with the optical combiner and to increase the energy efficiency of AR glasses.…”

Section: Introductionmentioning

confidence: 99%

Directional display for AR applications based on holography and photonic integrated circuits

Toubi,

Ghibaudo,

Martinez

2024

Optics, Photonics, and Digital Technologies for Imaging Applications VIII

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Conventionally, LCoS, µ-LEDs, and LBS are the principal micro-displays used in Near-Eye displays. We propose an alternative display concept, which offers increased flexibility for its integration with the optical combiner, resulting in a more efficient energy yield. The concept is based on photonic integrated circuits (PIC) in the visible range, active light extraction components using liquid crystals, and pixelated holograms. The combination of these elements enables the generation of an emissive point, whose properties: position, emission angle, and divergence are adjustable. We describe our concept and compare the expected performances with conventional solutions.

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Section: Introductionmentioning

confidence: 99%

Directional display for AR applications based on holography and photonic integrated circuits

Toubi,

Ghibaudo,

Martinez

2024

Optics, Photonics, and Digital Technologies for Imaging Applications VIII

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“…This beam is formed out of the interaction of thousands of randomly distributed Emissive Points (EPs) generated from a transparent Photonic Integrated Circuit (PIC) embedded within the lens. In particular, extraction occurs at crossings between waveguides and electrodes by means of a Liquid Crystal-based (LC) extraction system 12 . Each EP then interacts with a pre-recorded pixelated hologram that adjusts its phase and emission angle to form a plane-wave.…”

Section: Introductionmentioning

confidence: 99%

Multilayer photonic-integrated circuit design for dense random waveguide distribution addressing, application to near-eye display

Millard

Rainouard

Fowler

et al. 2023

Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR) IV

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Near-eye displays have become a technology of high interest for Augmented, Virtual and Mixed reality due to the unique immersive experience they provide to the user. The majority of these devices use macroscopic optical elements that make them bulky and heavy. Our team has proposed a disruptive near-eye display concept that uses the self-focusing effect to project an image to the user's retina. To form an image, emissive points are generated from a dense photonic integrated circuit embedded within the lens of a pair of smart glasses. In this work, we present the design of a dense routing architecture that addresses thousands of randomly distributed emissive points from a few hundred inputs. The circuit combines unbalanced waveguide splitter trees with a non-periodical addressing onto a dense waveguide network. We present the design optimization through numerical simulations and estimate the overall device performance based on simulation results. A waveguide interlayer crossing simulation indicates losses better than 0.003 dB/crossing, which guarantees low optical losses over thousands of crossings. By unbalancing correctly the splitter trees, we can obtain homogeneous power profiles over an emissive point distribution. The experimental validation of our design will be a major step towards the elaboration of a first prototype.

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“…In this paper, we focus on our experimental results on the activation of extraction grating. Simulations and theoretical dimensioning were carried out in a previous paper 4 .…”

Section: Introductionmentioning

confidence: 99%

Study and validation of switchable grating using liquid crystal for active waveguide addressing

Toubi

Colard

Lee

et al. 2023

Emerging Liquid Crystal Technologies XVIII

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In our Augmented Reality (AR) project, we are investigating the use of a retinal projection display based on the association of pixelated holograms and a dense distribution of waveguides. We study the use of gratings impregnated with liquid crystal to actively extract light from waveguides. We explore two extraction strategies: tuning the refractive index contrast between the grating teeth and grooves to erase the grating diffraction effect, and changing the index of the waveguide cladding to tune the evanescence of the guided mode. Firstly, we present and discuss the measurements of the diffraction efficiency of nano-imprint gratings impregnated with liquid crystal and refractive liquid index. Secondly, we discuss the results of integrated switchable extraction grating of the second strategy.

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Study of a liquid crystal impregnated diffraction grating for active waveguide addressing

Cited by 7 publications

References 14 publications

Directional display for AR applications based on holography and photonic integrated circuits

Directional display for AR applications based on holography and photonic integrated circuits

Multilayer photonic-integrated circuit design for dense random waveguide distribution addressing, application to near-eye display

Study and validation of switchable grating using liquid crystal for active waveguide addressing

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