Martina Gerken and David A. B. Miller,
"Wavelength demultiplexer using the spatial dispersion of multilayer
thin-film structures, IEEE Photonics Technol. Lett. 15, 1097-1099
We demonstrate that a single
66-layer nonperiodic thin-film stack can be used to separate four
wavelength channels by spatial beam shifting. This device uses group
velocity effects similar to the superprism effect observed in photonic
crystals, but shows larger and more controlled shifts including
constant dispersion allowing for equidistant channel spacing.
Experimentally, a nearly linear 100-Ám shift is achieved between 827
and 841 nm. System considerations are discussed.
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