| http://www.w3.org/ns/prov#value | - A target surface (not shown) would be positioned above the diffraction grating 600. [0072] In operation, as the incident light 604 is illuminated onto the diffraction grating 600, a first portion of the light 604 is immediately reflected off of the diffracting grating fingers 630 which, in this embodiment, have been coated with a reflective material, such as aluminum.
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