Geometric Phase Lens Technical Details

SPECIFICATIONS

  • Typical Transmittance: 95-99%
  • Phase precision: As low as 0.02 mrad/µm
  • Available F-numbers: F/1.0 – F/100+
    • For IR, minimum F-number is F/0.5
  • Smallest Grating Period: <2um at edge
  • Typical Bandwidths (narrowband type): ±6% around 1550nm, 800nm, 633nm, 532nm, or 455nm; other wavelengths custom
  • Typical Bandwidths (broadband type): 450-650nm, 500-900nm, 1-4 µm; other wavelength ranges custom
  • Size: Up to 300 x 300mm sq
    • Round or arbitrary cut samples are custom
  • GPL Arrays
    • Minimum Lenslet Size: 15 µm
    • 1um transition region between lenses
  • Patterning: Any lens/array shape possible
  • Larger custom lens sizes are available with additional NRE

BENEFITS

Because of their unique phase manipulation mechanism and radically different fabrication, GP Lenses offer:

  • Effectively spherical wavefront, without aberration
  • Aspherical and cylindrical wavefronts, without aberration
  • Precision wavefront compensation of other elements
  • Ultra-low loss
  • Low F-numbers available
  • Thickness is largely independent of lens F/# and size
  • High transmission across visible or infrared wavelengths
  • Polarization dependent, with a positive or negative focal length controlled by the input polarization
  • Chromatic dispersion inverse to refractive lenses, allowing convenient compensation

Polarization Directed Flat Lenses

  • Unique Flat Lens Design
  • Polarization Dependent Focal Length
  • Excellent Transmission from 450 – 650nm

Polarization Directed Flat Lenses are flat lenses formed with polymerized liquid crystal thin-films that create a focal length that is dependent on polarization state. These unique lenses will have either a positive or negative focal length depending on the phase of the input polarization. With right handed circularly polarized light, the lenses will produce one focal length, while left handed circularly polarized light will present a focal length with the opposite sign. Unpolarized light will produce a positive and negative focal length at the same time. Both output waves are circularly polarized and orthogonal to each other. These Polarization Directed Flat Lenses are approximately 0.45mm thick, effectively simulating an ideal thin lens and are free from spherical aberration.

Additional Information

GP Lenses can be used in combination with refractive lenses, for ultra compact systems, and/or for chromatic aberration correction. Complex phase profiles can be made, much more easily than traditional diamond turning. Microlens arrays may be square, rectangular, or hexagonal, and lenslets may have radically different focal lengths. While transmission GP Lenses are most common, they can instead be made on mirrored substrates achieving reflective –mode.

Principle:

GPL Phase Equation
  • Structure is nonlinear orientation angle
  • Phase = (see image on right)
  • Phase can be aspheric, aberration-corrected, or any function
  • Polarization selects ± focal length
GPL example
  • Broadband
  • Real transmittance into Obj + Conj beams ~99% !
  • If RHC input, all is focusing 99.4%
  • If LHC input, all is diverging 99.2%
  • If other, both waves are present
Image of GPL output

FAQs

Can you reduce the weight of my large optical elements?

Yes. Our optics are thin films that have very little weight. Even large size films are a fraction of the weight and thickness of traditional optical elements.
Yes. By using a combination of GPLs and CC-GPLs and potentially some standard lenses, you can correct aberrations, get rid of expensive optical materials and make the lens system shorter in length.
Yes. This would just be a custom GPL solution.
Yes. Because our films are flat, we can fabricate and laminate them together in a single monolithic component.
Yes. Our GPLs can be customized to add aberrations for correction.

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