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Bragg Polarization Grating (BPG)

Traditional Optics Compared to ImagineOptix BPG

BPG – Tech Comparison (AR/VR)

Parameter Bragg PG Holographic Surface Relief
Field of View (FOV) 60° 19° 17.5°
Wavelength Range Tunable for Narrow or Wideband Narrowband Wideband
Total Waveguide Efficiency Up to 90% 15% 15%-20%
Grating Thickness d ~2 µm >100um >100um

 

Bragg PGs Have:

  • Lower cost than holographic or surface relief
  • High scalability for volume manufacturing
    • Simple replication process
  • High Uniformity
    • Output efficiency can have gradient
  • Very Low Haze
    • In noise floor of detector

Current Performance Specs

  • Sub-wavelength grating periods for all VIS
    • Current: 312nm
    • Development target: 275nm
  • On axis performance for wave-guiding

 

 

BPG – Tech Comparison (Telecom)

Parameter Bragg PG Reflection (Blazed) Transmission (Blazed)
Angle Range Wide Narrow Narrow
Peak Efficiency Up to 95% 70-90% 70%
Grating Thickness d ~2 µm >100um >100um

Bragg PGs have:

  • Lower cost than holographic or Blazed/Ruled
  • High scalability for volume manufacturing
    • Simple replication process
  • High uniformity
    • Output efficiency can have gradient
  • Very low haze
    • In noise floor of detector

BG – AR/VR Comparison Conclusions

Parameter Vive Hololens IO AR/VR
Size Medium/Bulky Large Compact
Weight 555g 579g <200g
Both AR + VR Capable VR only AR only AR + VR
Image Artifacts Severe God Rays Minimal None
Overall Image Quality Fair Very Good Excellent
  • Image Quality
    • Vive: worst image quality
    • Hololens & IO AR/VR: above average
  • Size & Weight
    • IO: less than half the weigh of the Vive & Hololens
    • IO: compact like a pair of sunglasses
  • AR/VR Capable
    • IO: only one with both AR & VR capability

Geometric Phase Lens (GPL)

Traditional Optics Compared to ImagineOptix GPL

Parameter Traditional Lens ImagineOptix GPL
Thickness 5-6mm <0.5mm thick
Weight 4-6g <1g
Aberrations Multiple (Spherical, Coma, Astigmatism, etc.) Aberration Free
Lens Type Limited to fabrication capabilities Any lens type or profile
Focus Primary Only Both Primary and Conjugate
Manufacturing Can be expensive and difficult to manufacture (grind, polish) Simple manufacturing process gives low cost and rapid prototyping
Chromatic Dispersion Positive Negative, used for correction

 

Polarization Grating (PG)

Comparison image of current holographic grating optics to ImagineOptix Polarization Grating

Parameter Holographic Grating ImagineOptix PG
Thickness 100-200um 2-4um
Orders Multiple Only +/- 1st orders only
Spectral Characteristics Broadband: No Broadband: Yes
Limited to narrow spectrum Can be tuned for narrow or  broadband

Polarization Conversion System (PCS)

Parameter Traditional PCS ImagineOptix PCS
Conversion Efficiency 55-65% 75-85%
Number of Components 4 elements Single monolithic element
Spectral Characteristics Need multiple alignments in assembly Easily added to existing designs
Change in Etendue More than double Increase only 50-75%

Multi-Twist Retarder (MTR)

Parameter Traditional Retarder ImagineOptix MTR
Retardation Values ¼λ, ½λ ¼λ, ½λ, fractional
Patterning No Multiple Domains

(any pattern)

Color Filter No Chromatic
Wavelength Narrow, Achromatic Narrow, Achromatic,

Super-Achromatic

(400-4000nm)

Thickness 100um-3mm 2-4 µm
# of Films Multiple Layers/Plates 1-3 Layers
Manufacturability Complex Simple Fabrication
Cost $$ – $$$$ $

Vortex Patterned retarder (vpr)

Parameter Traditional Vortex Retarder ImagineOptix VPR
Thickness 1-4mm thick <0.5mm thick
Wavelengths Limited Can be tuned for any wavelength from 400-4000nm
Charges Limited to two charges (m=1,2) Any charge is possible (m=1,2,3,4,8,16,32)
Only one charge per component Multiple charges in patterned/louvered domains: nearly any pattern, with resolution down to <5 µm
Manufacturing Complicated mastering, therefore expensive Simple manufacturing process gives low cost and rapid prototyping
Cost Can be expensive and difficult to manufacture (grind, polish) <$500