Optical also has unique equipment capable of making extremely fine
pitch gratings on a wafers scale at low cost and with quick turnaround
times. The image indicates a grating with a depth of 395 nm and a width
of 294 nm. These gratings allow for light to be very efficiently diffracted
at grazing incident angles. Useful when dense wavebands need to be separated
or when large diffraction angles need to be generated, this capability
opens up a range of other applications.
For example, by making the pitch smaller than
the wavelength, form bi-refringence can be achieved and pixilated polarization
imagers can be created as well as wafer scale retarders. Yet another application
is the creation of moth's eye" type anti-reflection surface structures
eliminating the need for antireflective coatings.
- Wire grid and pixilated wire grid polarizers
- Polarization imagers
- Pixilated polarization imagers
- Anti-reflection surfaces without the need for
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