本論文利用光配向技術結合樣品的旋轉使液晶樣品配向成單面或雙面的放射狀與同心圓狀排列，製作方法簡單，僅需一次曝光過程即可完成，且製作過程不用外加電壓或聚合物來固定結構。其中單面光配向達成扭轉放射/同心圓狀液晶結構可用來當作一偏振調制元件，可將水平方向的線性偏振光轉換成放射狀或弧對稱狀線性偏振光，此外，我們可以透過改變用來達成光配向用的線性偏振光方位角的不同，得到界於放射狀與同心圓狀間不同漩渦程度排列的液晶配向，進而得到不同漩渦程度的軸對稱線性偏振光。此外，我們也對上述各種配向元件進行模擬，模擬結果與實驗結果也相當符合。
我們進一步透過雙面配向的機制製作出雙面的放射狀與同心圓狀液晶樣品，透過電光特性的量測得知此軸對稱液晶排列結構非常一致且整齊，若將其設計為一個1/2波板，則可以應用作偏振調制元件，入射線性偏振光將被調制為軸對稱線性偏振光出射。

This work demonstrates axially symmetric polarization modulators based on photo-alignment in dye-doped liquid crystal (DDLC) films. A linear-shape and linearly polarized beam is applied onto a rotated homogeneous DDLC cell to achieve three axially symmetric polarizations - radial, azimuthal and vortical. Additionally, the spiral degree of the axially symmetric vortical polarization can be controlled by varying the polarization of the pumping light. In addition, simulations on above devices are performed and the simulation results agree well with the experiment.
Furthermore, we also demonstrate two type double-side axially symmetric LC structures which have radial and azimuthal symmetry base on DDLC film by using double-side photoalignment technique. The axially symmetric structure is very uniform based on the measurements of its electro-optical (E-O) characteristics and the cell is simple to fabricate. Notably, the devices having axially symmetric structure have high potential for uses as spatial polarization converters, if the cell is designed to function as a λ/2 axially-symmetric DDLC plate. The polarization of an incident linearly polarized light onto the radial symmetric and azimuthal symmetrical cells will be converted to light beam with axially symmetric polarization.

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