Abstract
We describe a systematic investigation on void structures fabricated by femtosecond laser irradiation inside dielectric materials for fabrication of a compact optical circuit. Void shapes fabricated in 5 different dielectric materials were compared and the physical constants determining the void shape were discussed. A long void array is obtainable in a material which has a low critical power for self-focusing. It was also indicated that the coefficient of thermal expansion is a dominant governing factor to fabricate a precise void which has a clear boundary. Furthermore, we propose and design a Mach-Zehnder interferometer in fused silica composed of optical waveguides and photonic crystals to verify practical application of a void array. Simulation results of the optical propagation in a Mach-Zehnder interferometer indicated that the photonic crystals using a void array have potential to fabricate compact optical circuits.
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Terakawa, M., Toratani, E., Shirakawa, T. et al. Fabrication of a void array in dielectric materials by femtosecond laser micro-processing for compact photonic devices. Appl. Phys. A 100, 1041–1047 (2010). https://doi.org/10.1007/s00339-010-5942-3
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DOI: https://doi.org/10.1007/s00339-010-5942-3