relation: http://d-scholarship-dev.library.pitt.edu/17379/
title: Photochemically Controlled Photonic Crystals
creator: Kamenjicki, M
creator: Lednev, IK
creator: Mikhonin, A
creator: Kesavamoorthy, R
creator: Asher, SA
description: 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.
date: 2003-10-01
type: Article
type: PeerReviewed
format: text/plain
language: en
rights: attached
identifier: http://d-scholarship-dev.library.pitt.edu/17379/1/licence.txt
identifier:   Kamenjicki, M and Lednev, IK and Mikhonin, A and Kesavamoorthy, R and Asher, SA  (2003) Photochemically Controlled Photonic Crystals.  Advanced Functional Materials, 13 (10).  774 - 780.  ISSN 1616-301X     
relation: 10.1002/adfm.200304424