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29 November 2000 Fabrication and optical properties of an organic crystal waveguide
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A ridge waveguide of an organic salt, 4-N,N-methyl- stilbazorium tosylate, DAST, which has the largest second- order optical nonlinearities among organic materials, was fabricated for the first time to our knowledge. DAST crystal was covered by poly (methyl methacrylate) as a protect layer for a photo-resist solution, then standard photolithography and oxygen reactive ion etching (RIE) processes were applied. DAST ridge waveguide, 34x20 micrometers and 6x6 micrometers channel s with 2mm in length were successfully fabricated by this process. To reduce the refractive index of the crystal, photo bleaching was effectively applied for DAST crystal. So, photobleaching can be applied to fabricate a cladding layer for the ridge waveguide.
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Toshikuni Kaino, Kazuya Takayama, Cai Bin, and Kyoji Komatsu "Fabrication and optical properties of an organic crystal waveguide", Proc. SPIE 4106, Linear, Nonlinear, and Power-Limiting Organics, (29 November 2000);

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