We discuss asymmetric reflectance in surface plasmon Bragg gratings incorporating optical gain, referred to as
active asymmetric surface plasmon Bragg gratings. It is shown that balanced modulation of index and gain/loss with
quarter pitch spatial shift causes unidirectional coupling between contra-propagating modes in long-range surface
plasmon polariton Bragg gratings. Such gratings operate at the breaking threshold of parity-time symmetry
(exceptional point). Two active asymmetric surface plasmon Bragg gratings designs are proposed and their
performance is examined through modal and transfer matrix method computations.
Elham Karami Keshmarzi, Choloong Hahn, Seok Ho Song, Cha Hwan Oh, R. Niall Tait, and Pierre Berini, "Active asymmetric plasmonic Bragg gratings," Proc. SPIE 9920, Active Photonic Materials VIII, 99201T (Presented at SPIE Nanoscience + Engineering: September 01, 2016; Published: 16 September 2016); https://doi.org/10.1117/12.2238704.
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