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Design of intelligent mesoscale periodic array structures utilizing smart hydrogelMesoscale Periodic Array Structures (MPAS, also known as crystalline colloidal arrays), composed of aqueous or nonaqueous dispersions of self-assembled submicron colloidal spheres are emerging toward the development of advanced optical devices for technological applications. This is because of their unique optical diffraction properties and the ease with which these intriguing properties can be modulated experimentally. Moreover our recent advancements in this area which include 'locking' the liquid MPAS into solid or semisolid polymer matrices for greater stability with longer life span, and incorporation of CdS quantum dots and laser dyes into colloidal spheres to obtain nonlinear optical (NLO) responses further corroborate the use of MPAS in optical technology. Our long term goal is fabrication of all-optical and electro-optical devices such as spatial light modulators for optical signal processing and flat panel display devices by utilizing intelligent nonlinear periodic array structural materials. Here we show further progress in the design of novel linear MPAS which have the ability to sense and respond to an external source such as temperature. This is achieved by combining the self-assembly properties of polymer colloidal spheres and thermoshrinking properties of smart polymer gels. At selected temperatures the periodic array efficiently Bragg diffracts light and transmits most of the light at other temperatures. Hence these intelligent systems are of potential use as fixed notch filters optical switches or limiters to protect delicate optical sensors from high intensity laser radiation.
Document ID
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Sunkara, H. B.
(NASA Marshall Space Flight Center Huntsville,AL United States)
Penn, B. G.
(NASA Marshall Space Flight Center Huntsville,AL United States)
Frazier, D. O.
(NASA Marshall Space Flight Center Huntsville,AL United States)
Weissman, J. M.
(Pittsburgh Univ. Pittsburgh, PA United States)
Asher, S. A.
(Pittsburgh Univ. Pittsburgh, PA United States)
Date Acquired
September 6, 2013
Publication Date
March 29, 1996
Subject Category
Nonmetallic Materials
Report/Patent Number
NAS 1.15:111442
Meeting Information
Meeting: 1996 ACS Spring Meeting
Location: New Orleans, LA
Country: United States
Start Date: March 24, 1996
End Date: March 29, 1996
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.
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