New Route to Three‐Dimensional Photonic Bandgap Materials: Silicon Double Inversion of Polymer Templates

cient refractive-index contrast to open a complete photonic bandgap. In this report, we overcome these problems by employing a novel, versatile, scalable, and cost-effective silicon double-inversion method to synthesize the first Si replica of a polymeric photonic crystal. This method can be applied to any photoresist template produced by direct-laser writing (DLW), holographic laser lithography, or combinations thereof. It also incorporates a template-independent step to fine-tune the filling fraction of the high-index material, thereby allowing larger PBGs to be obtained than with the template alone. The procedure exclusively comprises straightforward, inexpensive, industry-compatible steps, perfectly suitable for mass production of complex and functionalized photonic-crystal-based de

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