@article {836866, title = {Patterning Hierarchy in Direct and Inverse Opal Crystals}, journal = {Small}, volume = {8}, year = {2012}, note = {This work was supported by the Air Force Office of Scientific Research Award $\#$ FA9550-09-1-0669- DOD35CAP. L.M. acknowl- edges fellowship support from the Department of Homeland Security (DHS). M.K. acknowledges funding from the Alexander von Humboldt Foundation. Electron microscopy and photolitho- graphy were performed at Harvard{\textquoteright}s Center for Nanoscale Systems. Fabrication was partially supported by the National Science Foun- dation{\textquoteright}s MRSEC Award $\#$DMR-0820484. We thank Dr. Mughees Khan for nanofabrication of the blade surface used in this work.}, pages = {1904-1911}, doi = {10.1002/smll.201102691}, author = {L. Mishchenko and Hatton, B. and Kolle, M. and Aizenberg, J.} }