Author Affiliations
Abstract
State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China
A new organic-inorganic hybrid material, which shows photo-induced reduction of refractive index as well as volume contraction, is prepared using a sol-gel method. This material is coated on a Si substrate by spin-coating to manufacture film. After irradiated by ultraviolet (UV) light with a deuterium lamp for 5 h, the thickness of film decreases largely by 55%, and the refractive index of film changes from 1.484 to 1.445 at 550 nm. The film’s optical thickness exhibits an exponential change with the increasing irradiation time. Futhermore, the photo-patternning of the organic-inorganic hybrid film without any further process (wet etching and thermal curing) is performed utilizing the volume contraction on UV-light irradiation. This film has potential applications for fabrication of patterned filter array and apodizing filter by direct light writing, and also demonstrates good temperature stability and immunity to visible light exposure.
光学薄膜 光敏材料 光敏性能 光致图形化 160.5335 Photosensitive materials 310.6860 Thin films, optical properties 100.4994 Pattern recognition, image transforms Chinese Optics Letters
2010, 8(4): 435