美国匹兹堡大学的一研究组已制作一类新型材料，可能预示另一代光通信和光计算器件的来临。Ｓ．Ａｓｈｅｒ等把聚合化学材料和胶体的独特特性结合，制作了一种具新奇光学特性的三维光栅。光束可使光栅的衍射特性发生通断变化，并在纳秒时间内使材料从玻璃般透明变成类似乳白玻? A research group at the University of Pittsburgh in the United States has produced a new class of materials that could signal the advent of another generation of optical communications and optical computing devices. S. Asher et al. Combined the unique properties of polymeric chemistry with colloids to create a three-dimensional grating with novel optical properties. The beam can make the grating diffraction characteristics change off and on, and in nanosecond time to make the material from the glass-like transparent into a milky white glass?