Triply Periodic Bicontinuous Structures as Templates for Photonic Crystals: A Pinch-off Problem


  • This research is supported by the Office of Naval Research (ONR), Grant # N00014-05-0303 and NSF NIRT ECS-0303981. S.Y. is thankful for the 3M Nontenured Faculty Grant. J.H.M. acknowledges the Korea Research Foundation postdoc fellowship (# KRF-2005-000-10299). S.-M.Y. is supported by the Creative Research Initiative Program of MOST/KOSEF. Supporting Information is available online from Wiley InterScience or from the author.


original image

Triply periodic diamond, cubic, and gyroid structures are studied as templates for the fabrication of 3D photonic crystals (see figure). The achievable backfilling volume fraction and bandgap properties are analyzed by considering the pinch-off of level surfaces. The conformal coating on such templates is found to result in incomplete filling and loss of the photonic bandgap. An attempt to solve this problem is made by using electrophoretic deposition, which results in a nearly completely filled 3D titania structure.