Diffractive structures are typically linear or crossed microstructures that are small enough to diffract light (10 micron to sub-micron).   A linear diffraction grating may be made using holographic interference.   A popular film called rainbow is used in many packaging designs for an eye catching rainbow color effect.   It can also be used in a diffractive micro-flake to produce a diffractive pigment.   Another use might be a Holographic Optical Element (HOE) or a Computer Generated Hologram (CGH).   A CGH can be a stepped microstructure that forms an image.   These microstructures can be originated in many ways such as Holographic interference, Lithographic techniques, Laser or Ion beam etching.

Moth-eye

WFT has experience working on Moth-eye structures since 1990.  WFT has successfully produced Artificial Motheye structures that have excellent anti-reflectivity across a broad spectrum from a gradient index micro-structured profile.  These micro-structures can be produced on a thin film but are difficult to emboss due to their large surface area.  They are sensitive to finger oils and are not very durable.  They are best used for internal surface that do not come in direct contact with the outside world.  WFT has used these structures primarily for R&D purposes to demonstrate our abilities to originate, tool and reproduce nanometer sized structures on a roll of film.

Artificial Moth-eye structures are produced by recording in photo resist interference fringes generated at the intersection of two coherent laser beams. WFT used this holographic lithography process to produce a moth-eye master tool, which is then used to produce roll-to-roll material.

For additional information regarding our micro-structured films please contact our sales department at Information@wft.bz.

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