We present fabrication of 3D photonic band gap woodpile crystals from photosensitive chalcogenide glass with the help of interference lithography and layer by layer construction. The alignment method is described, which is scalable to extremely small feature sizes required for photonic crystals in the visible region.
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Feigel, A., Kotler, Z., Sfez, B. et al. Interference lithography for 3D photonic band gap crystal layer by layer fabrication. MRS Online Proceedings Library 692, 291 (2001). https://doi.org/10.1557/PROC-692-K2.9.1