@conference {812491, title = {Photonic Time-Crystals and Momentum Band-Gaps}, booktitle = {CLEO: 2016, OSA Technical Digest}, year = {2016}, url = {https://www.osapublishing.org/abstract.cfm?uri=CLEO_QELS-2016-FM1D.4}, author = {Amr M. Shaltout and Jieran Fang and Alexander V. Kildishev and Valdimir M. Shalaev} }