National Sun Yat-sen University of Kaohsiung

San Fang Chemical Industry Company, Ltd.

Bestac Advanced Material Co., Ltd.

Chun-Ta Wang

Chung-Chih Feng

I-Peng Yao

Tsung-Hsien Lin

Yung-Chang Hung

Cheng-Chang Li

Li-Min Chang

Kuan-Wu Lin

Wei-Te Liu

Yu-Chieh Li

Lyang-Gung Wang

Heng-Yi Tseng

Hung-Chang Jau

Duan-Yi Guo

Hsin-Ru Song

Jun-Ting Guo

Cheng-Kuan Wu

Yi-Te Chuang

Chao-Kuei Lee

Han-Wei Zhang

A cholesteric liquid crystal polarizing grating includes two substrates, two alignment layers, and a liquid crystal layer. An interlayer space is formed between the two substrates. The two alignment layers are respectively located on inner surfaces of the two substrates facing the interlayer space. Alignment directions of the alignment layers are periodically arranged. An alignment plane of each alignment layer is divided into a plurality of rows. The alignment directions in a same row are the same, and the alignment directions in adjacent rows rotate relative to each other. The plurality of rows with the alignment directions rotated by 180 degrees defines a grating period. The liquid crystal layer is located in the interlayer space. Liquid crystal molecules adjacent to the two alignment layers are arranged following the alignment direction of each alignment layer to form a polarizing grating with the grating period.

Cholesteric liquid crystal polarizing grating

A switching method for a liquid crystal polarizing grating is provided to solve the problems of low diffraction efficiency and incapability in switching between reflection and transmission modes of a conventional polarizing grating. The switching method includes five steps. In an initial step, no voltage is applied, and liquid crystal molecules of cholesteric liquid crystal layer of the liquid crystal polarizing grating are arranged in a planar structure. In a first step, a first alternating current voltage with a first frequency is applied. In a second step, a second alternating current voltage with a second frequency is applied. In a third step, a third alternating current voltage with a third frequency is applied. In a fourth step, a fourth alternating current voltage with a fourth frequency is applied, and the liquid crystal molecules are arranged in a uniform lying helix structure.

Switching method for switching a liquid crystal polarizing grating between trnsmission difraction and reflection difraction

A one-way glass with switching modes includes an absorbing layer located on a weak light side, a reflecting layer located on an intense light side, and a converting layer stacked between the absorbing layer and the reflecting layer. The absorbing layer absorbs first polarized light and allows second polarized light to pass through. The reflecting layer reflects the first polarized light and allows the second polarized light to pass through. Unpolarized light incident from the weak light side or from the intense light side is respectively converted into the polarized light. During the process of gradually adjusting the converting layer from a twisted state to a vertical state, rotated angles of polarization directions of the first polarized light and the second polarized light gradually decrease.

One-way glass with switching modes

The present invention relates to a polishing pad comprising a base sheet containing a restriction layer. The invention also relates to a polishing apparatus and a method for manufacturing a polishing pad.

Polishing pad, polishing apparatus and method for manufacturing polishing pad

A silicon based terahertz full wave liquid crystal phase shifter is provided. The liquid crystal phase shifter has a first silicon conductive substrate, a second silicon conductive substrate, a plurality of pads, and a liquid crystal. The first and second silicon conductive substrates, instead of the quartz glass and transparent electrode, such as ITO, are used as substrates and to provide electrodes of the liquid crystal phase shifter. Thus, the effect of the liquid crystal phase modulation of the liquid crystal phase shifter in the THz range can be improved.

Silicon based terahertz full wave liquid crystal phase shifter

The present invention relates to a sheet for mounting a workpiece and a method for making the same. The method includes the steps of: (a) providing a sheet body having a top surface, a bottom surface, at least one side surface and a plurality of pores, wherein some of the pores open at the side surface; and (b) sealing or narrowing the pores that open at the side surface. Since the pores that open at the side surface are sealed or narrowed, the slurry is prevented from entering into the interior of the sheet body. Therefore, the infiltration distance reaches a predetermined value slowly, thereby increasing the effective life of the sheet.

Sheet for mounting a workpiece and method for making the same

The present invention relates to a conductive polishing pad and a method for making the same. The conductive polishing pad includes a bottom layer, a conductive film and a polishing layer. The bottom layer includes a first high polymer and a fiber base. The first high polymer covers the fiber base, and has a plurality of first holes. The conductive film is disposed on the bottom layer. The polishing layer is disposed on the conductive film, and includes a second high polymer. The second high polymer has a plurality of second holes. Even though the bottom layer and the polishing layer are poor conductors, the conductivity thereof is raised by the conductive film, so that the polishing pad has good conductivity. Further, the polishing pad has a flexible surface, which prevents a surface of a workpiece to be polished from being scratched during polishing.

Conductive polishing pad and method for making the same

A groove structure for avoiding stripping of a polishing surface of a polishing pad, the polishing pad including a base material and a grinding layer. The base material has a surface. The grinding layer is disposed on the surface, and part of the surface around the edge of the base material is exposed. The grinding layer has a plurality of first grooves and second grooves, and the first grooves cross the second grooves to define a plurality of grinding areas. The exposed part of the surface around the edge of the base material is located between the first grooves, the second grooves and the edge of the polishing pad. The polishing pad contains more grinding liquid, to clean the small grinded pieces. The grinding layer does not have an acute structure and is not easily peeled to form the small grinded pieces. Therefore, grinding quality and grinding effect are improved.

Growing community of inventors

Kaohsiung, Taiwan

Chun-Ta Wang