A diffusive film characterized with a directional property was developed. This new type of diffusive film is achieved
with a new technology derived from holography. Directionality of diffusive film is characterized because it diffuses the
light from the determinate angle strongly more than other angles.
This discriminative property is consequence of the diffusive film structure that consists of different index transparent
materials.
Additionally, The film is a volume type diffuser, and the surfaces are almost flat so it is possible to laminated it to
various part of other elements without remarkable affecting the diffusing properties of the film. Moreover, durability of
this film is actually enough to consumer applications.
With these remarkable properties, this diffusive film can widely applied to display systems etc.
The characteristics of Phenanthrenquinone (PQ) doped Polymethyl methacrylate (PMMA) for recording edge-illuminated holographic spectral filters for dense wavelength division multiplexing applications are evaluated. Filter design includes the effects of material absorption and apodization of the index profile. Rigorous coupled wave theory and transfer matrix methods are used to simulate the performance of the filters for dense wavelength division multiplexing functions. The experimentally measured spectral FWHM bandwidths were 0.20 nm and the primary limitation of the grating performance was found to be residual material absorption.
To meet the requirements of DWDM spectral filters at 1550nm, we suggest a new design for holographic Bragg gratings in photopolymers. The design is based on an edge-illuminated hologram configuration. Using this configuration, it is not difficult to make a very long grating and to apply apodization to the grating profile. A larger range of filter functions can be realized by cascading several gratings with different properties or by combining the gratings with other planar optical elements. Here, we show both simulated and experimental results using this arrangement. Rouard's method is used to examine the properties of apodized grating, and the results indicate the potential for narrow spectral bandwidths and high side lobe suppression. Experimental results with two types of photopolymer, Aprillis ULSH-500-7A and Phenanthrenequinone-doped PMMA, provide evidence of the effectiveness of this arrangement.
In this presentation we discuss a digital signal processing approach to optical component design and the fabrication of components in photopolymer layers and ion exchange waveguides. This technique is useful in designing complex filters such asapodized and cascaded gratings. We then illustrate the design process for a new type of Bragg filter formed in an edge illuminated holographic photopolymer. The filter can readily be apodized to reduce side lobes and cascaded to form various types of passband filters. In order to integrate filters of different types with optical fiber networks we describe a selectively buried ion exchange waveguide that provides efficient coupling between optical fibers and polymer materials deposited on the surface of the waveguide.
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