19_12/2007Cover Picture: A Germanium Inverse Woodpile Structure with a Large Photonic Band Gap (Adv. Mater. 12/2007)

Germanium inverse woodpile 3D photonic crystals with a large (25%) photonic band gap in the infrared (background image) were fabricated through a multistep replication procedure. A polymer scaffold was first created by direct-write assembly, followed by the conformal growth of oxide and semiconductor layers, and removal of the polymer and oxide (foreground), as reported on p. 1567 by Paul Braun, Jennifer Lewis, and co-workers.

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