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Integrated RGB Beam Combiner in Al2O3 Photonic Circuits with On-Chip Modulation for AR/VR Displays

Vahram Voskerchyan

Abstract

Aluminum oxide is a promising material for visible-light integrated photonics due to its low optical loss and wide transparency window across the RGB spectrum. This work presents the design and experimental demonstration of an integrated RGB beam combiner for applications in AR/VR, holography, 3D displays, and autostereoscopic display systems. The device employs Mach--Zehnder modulators for individual color modulation and gratings for out-of-plane emission. The experimental results demonstrate independent RGB routing, far-field beam combining, and thermo-optic modulation with an extinction ratio of up to 6.3~dB, highlighting the potential of Al$_2$O$_3$ photonic integrated circuits for compact dynamic color control at the pixel level.

Integrated RGB Beam Combiner in Al2O3 Photonic Circuits with On-Chip Modulation for AR/VR Displays

Abstract

Aluminum oxide is a promising material for visible-light integrated photonics due to its low optical loss and wide transparency window across the RGB spectrum. This work presents the design and experimental demonstration of an integrated RGB beam combiner for applications in AR/VR, holography, 3D displays, and autostereoscopic display systems. The device employs Mach--Zehnder modulators for individual color modulation and gratings for out-of-plane emission. The experimental results demonstrate independent RGB routing, far-field beam combining, and thermo-optic modulation with an extinction ratio of up to 6.3~dB, highlighting the potential of AlO photonic integrated circuits for compact dynamic color control at the pixel level.

Paper Structure

This paper contains 8 sections, 16 figures.

Table of Contents

  1. Introduction
  2. Concept
  3. Design and Simulations
  4. Fabrication
  5. Experimental Results
  6. Outlook
  7. Acknowledgments

Figures (16)

  • Figure 1: (a) Concept for a single RGB pixel in the proposed beam combiner design. (b) 3D visualization and schematic layout.
  • Figure 2: Platform layer stack and refractive index profile.
  • Figure 3: (a) Angle of emission from RGB gratings. (b) Upward directionality versus the length of RGB gratings.
  • Figure 4: Phase versus amplitude change in the Mach--Zehnder modulator.
  • Figure 5: Full mask layout of the fabricated system.
  • ...and 11 more figures