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Martina Gerken and David A. B. Miller
"Multilayer Thin-Film Structures with High Spatial Dispersion,"
Applied Optics 42, 1330 – 1345 (2003) We
demonstrate how to design thin-film multilayer structures that
separate multiple wavelength channels with a single stack by spatial
dispersion, thus allowing compact manufacturable wavelength
multiplexers and demultiplexers and possibly beam-steering or
dispersion-control devices. We discuss four types of structure
-periodic one-dimensional photonic crystal superprism structures,
double-chirped structures exploiting wavelength-dependent penetration
depth, coupled-cavity structures with dispersion that is due to stored
energy, and numerically optimized nonperiodic structures utilizing a
mixture of the other dispersion effects. We experimentally test the
spatial dispersion of a 200-layer periodic structure and a 66-layer
nonperiodic structure. Probably because of its greater design freedom,
the nonperiodic structure can give both a linear shift with wavelength
and a larger usable shift than the thicker periodic structure gives.
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