1. Articles from Shan-Chuang Pei

    1-2 of 2
    1. Non-invasive characterization of the domain boundary and structure properties of periodically poled ferroelectrics

      Non-invasive characterization of the domain boundary and structure properties of periodically poled ferroelectrics
      Shaping the ferroelectric domains as waveguide, grating, lens, and prism are key to the successful penetration of periodically-poled ferroelectrics on various wavelength conversion applications. The complicated structures are, however, difficult to be fully characterized, especially the unexpected index contrast at the anti-parallel domain boundaries are typical in the order of 10−4 or less. An ultrahigh resolution optical coherence tomography was employed to fully characterize the domain boundary and structure properties of a periodically-poled lithium niobate (PPLN) waveguide with an axial resolution of 0.68 μm, an transversal resolution of 3.2 μm, and an index contrast sensitivity of 4x10 ...
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    2. Microstructural and microspectral characterization of a vertically aligned liquid crystal display panel

      Microstructural and microspectral characterization of a vertically aligned liquid crystal display panel
      e microstructural and microspectral characteristics of a vertically aligned liquid crystal display (VA-LCD) panel were obtained noninvasively for the first time. With 1 μm axial and 2 μm transversal resolutions, the cell gap profile beneath the patterned thin-film transistor of the VA-LCD panel can clearly be resolved. The thicknesses of the multiple thin-film layers and the embedded defects can also be unveiled. As far as spectral response is concerned, the light transmittance at the layer boundaries can be estimated from the measured reflectance, which is crucial information for the design of a highly transmissive panel. The color shift of the ...
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    1-2 of 2
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    1. (2 articles) National Taiwan University
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