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Photochemically Controlled Photonic Crystals

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

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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.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Kamenjicki, M
Lednev, IK
Mikhonin, A
Kesavamoorthy, R
Asher, SAasher@pitt.eduASHER
Date: 1 October 2003
Date Type: Publication
Journal or Publication Title: Advanced Functional Materials
Volume: 13
Number: 10
Page Range: 774 - 780
DOI or Unique Handle: 10.1002/adfm.200304424
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 1616-301X
Date Deposited: 27 Feb 2013 18:46
Last Modified: 02 Feb 2019 16:55


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