<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Photochemically Controlled Photonic Crystals"^^ . "We have developed photochemically controlled photonic crystals that may be useful in novel recordable and erasable memories and/or display devices. These materials can operate in the UV, visible, or near-IR spectral regions. Information is recorded and erased by exciting the photonic crystal with ∼360 nm UV light or ∼480 nm visible light. The information recorded is read out by measuring the photonic crystal diffraction wavelength. The active element of the device is an azobenzene-functionalized hydrogel, which contains an embedded crystalline colloidal array. UV excitation forms cis-azobenzene while visible excitation forms trans-azobenzene. The more favorable free energy of mixing of cis-azobenzene causes the hydrogel to swell and to red-shift the photonic crystal diffraction. We also observe fast nanosecond, microsecond, and millisecond transient dynamics associated with fast heating lattice constant changes, refractive index changes, and thermal relaxations."^^ . "2003-10-01" . . "13" . "10" . . "Advanced Functional Materials"^^ . . . "1616301X" . . . . . . . . . . . . . . . . . . . "IK"^^ . "Lednev"^^ . "IK Lednev"^^ . . "M"^^ . "Kamenjicki"^^ . "M Kamenjicki"^^ . . "A"^^ . "Mikhonin"^^ . "A Mikhonin"^^ . . "SA"^^ . "Asher"^^ . "SA Asher"^^ . . "R"^^ . "Kesavamoorthy"^^ . "R Kesavamoorthy"^^ . . . . . . "Photochemically Controlled Photonic Crystals (Plain Text)"^^ . . . "licence.txt"^^ . . . "Photochemically Controlled Photonic Crystals (Other)"^^ . . . . . . "indexcodes.txt"^^ . . "HTML Summary of #17379 \n\nPhotochemically Controlled Photonic Crystals\n\n" . "text/html" . .