Optical microfabrication of highly reflective volume Bragg gratings

Vincent K.S. Hsiao, Tzu Chau Lin, Guang S. He, Alexander N. Cartwright, Paras N. Prasad, Lalgudi V. Natarajan, Vincent P. Tondiglia, Timothy J. Bunning

研究成果: 雜誌貢獻期刊論文同行評審

40 引文 斯高帕斯(Scopus)


An approach for fabricating wide-bandwidth and highly reflective Bragg grating structures with the technique of holographic photopolymerization of a liquid crystal (LC) polymer composite is presented. The key to this fabrication method that distinguishes it from previous methods is the use of a nonreactive solvent, acetone, to dissolve the photoinitiator and coinitiator in an acrylate monomer/LC mixture. The addition of acetone results in the creation of controllable periodic voids inside the thin film after the acetone evaporates. Peak reflectivity as high as 80% and a broad reflection bandwidth of 80 nm were observed in the reflection gratings formed with acetone present in the starting mixture. It was estimated from a fit to the experimental data that the resulting index mismatch was approximately 0.2; consistent with the presence of air voids. It is determined that tunable wavelength, diffraction efficiency, and bandwidth of reflection notches can be achieved by backfilling with fluids of different refractive indices.

頁(從 - 到)1-3
期刊Applied Physics Letters
出版狀態已出版 - 28 3月 2005


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