Hsueh, W.J.W.J.HsuehWun, S.J.S.J.WunWEN-JENG HSUEH2020-01-172020-01-172011https://scholars.lib.ntu.edu.tw/handle/123456789/451916Simple expressions for the maximum omnidirectional bandgap of bilayer photonic crystalsjournal article10.1364/OL.36.0015812-s2.0-79956312753https://www.scopus.com/inward/record.uri?eid=2-s2.0-79956312753&doi=10.1364%2fOL.36.001581&partnerID=40&md5=7a7a318abb0ea0bb77fcfd6fc65e14bb