title: Leaky-mode resonant reflectors with extreme bandwidths.
abstract: We present ultrawide flat-band reflectors enabled with multilevel resonant leaky-mode structures. The reflectors are designed using particle swarm optimization. We show that three-level silicon-on-insulator structures provide bandwidths of approximately 840 nm for TE polarization and approximately 835 nm for TM polarization, across which reflectance is greater than 99% and 97.5%, respectively. For the germanium-on-insulator system, the 99% TE and TM bandwidths are approximately 1100 nm and approximately 1050 nm. The results indicate the potential of multilevel resonant leaky-mode elements in electromagnetics and photonics.
authors.affiliation: Department of Electrical Engineering, University of Texas at Arlington, Arlington, Texas 76019, USA. saremi@uta.edu
authors.forename: Mehrdad
authors.initials: M
authors.lastname: Shokooh-Saremi
authors.forename: Robert
authors.initials: R
authors.lastname: Magnusson