Izentis offers both amplitude and phase transmission gratings.A grating where lightpasses through an opaque surface with multiple slits is known as an amplitude transmissiongrating, since the light varies as a periodic step function in amplitude. A more efficient transmission grating has aperiodic structure that alters the phase of the light without blocking the light. (The efficiency is defined by the ratio of lightintensity in a given non-zero diffraction order to monochromatic incoming light.)Thesegratings are known as phase gratings. An example is periodically-etched glass, suchthat the optical path difference between the etched and non-etched regions is halfa wavelength. Such a design suppresses the zeroth order which vastly improves efficiency. Please contact us for more information and quotes on transmission gratings.
Photograph and scanning electron micrograph of a freestanding transmission grating fabricated by Dr. Bruccoleri. This is an example of an amplitude grating for soft x-rays.
Scanning electron micrograph taken of the bottom surface of a freestanding transmission grating fabricated by Dr. Bruccoleri. The cross supports can be made narrower for applications that require higher x-ray throughput.