Transflective spatial filter based on azo-dye-doped cholesteric liquid crystal films

Journal Article · Mon Jul 04 00:00:00 EDT 2005 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.1990248· OSTI ID:20702553

Lin, T -H; Fuh, Andy Y.-G. ^[1]

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1. Institute of Electro-optical Science and Engineering, National Cheng Kung University, Tainan, Taiwan 701 (China)

This work demonstrates the feasibility of exploiting the photoisomerization effect in azo-dye-doped cholesteric liquid crystal (DDCLC) films with a concomitant decline of the phase transition temperature from the cholesteric to an isotropic phase (T{sub Ch-I}) as a spatial filter. The fabrication depends on the fact that the various intensities of the diffracted orders are responsible for the various degrees of transparency associated with the photoisomerized DDCLC film. High- and low-pass images in the Fourier optical signal process can be simultaneously observed via reflected and transmitted signals, respectively. A simulation is also performed, and the results are consistent closely with experimental data.

• OSTI ID: 20702553
• Journal Information: Applied Physics Letters, Vol. 87, Issue 1; Other Information: DOI: 10.1063/1.1990248; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AZO DYES
DIFFRACTION
DOPED MATERIALS
EXPERIMENTAL DATA
FABRICATION
FILMS
FILTERS
FOURIER TRANSFORMATION
IMAGES
LIGHT TRANSMISSION
LIQUID CRYSTALS
OPACITY
OPTICS
PHASE TRANSFORMATIONS
PHOTOCHEMISTRY
REFLECTION
SIGNALS
SIMULATION
TRANSITION TEMPERATURE