Optical: systems and elements – Optical modulator – Having particular chemical composition or structure
Patent
1992-09-16
1994-08-09
Ben, Loha
Optical: systems and elements
Optical modulator
Having particular chemical composition or structure
359296, 359576, 359885, 359900, 252582, G02F 100, G02B 100, G02B 522
Patent
active
053371852
ABSTRACT:
A rigid three dimensional diffraction grating is provided in the form of an ABA block copolymer that forms domains. The A domain of the block copolymer is preferably polystyrene and the B domain of the copolymer is preferably a diene such as polybutadiene or polyisoprene. The molecular weight of the diene can be synthetically controlled to regulate the interelement spacing of the polystyrene domains and control the diffraction obtained from the grating.
REFERENCES:
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patent: 5131736 (1992-07-01), Alvarez
Campos-Lopez et al, "Thermodynamic and Structural Properties of Polystyrene-Poly. Butadiene-Polystyrene Block Copolymers", Macromolecules, vol. 6, No. 3 (1973), pp. 515-423.
Asher, Flaugh, and Washinger, "Crystalline Colloidal Bragg Diffraction Devices: the Basis For a New Generation of Raman Instrumentation", Spectroscopy, vol. 1, No. 12, 26-31.
Rundquist, Photinos, Jagannathan, and Asher, "Dynamical Bragg diffraction from crystalline colloidal arrays", J. Chem. Phys., vol. 91, pp. 4932-4941 (1989).
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Rundquist, Kesavamoorthy, Brnardic, Xu, Asher, "Photothermal Compression of Colloidal Crystals", J. Chem. Phys., vol. 94, pp. 711-717 (1991).
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Meier Joseph F.
Melamed Nathan T.
Ben Loha
Collins Darryl J.
Westinghouse Electric Corp.
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