16 September 2016 Active asymmetric plasmonic Bragg gratings
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Abstract
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.
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Elham Karami Keshmarzi, Elham Karami Keshmarzi, Choloong Hahn, Choloong Hahn, Seok Ho Song, Seok Ho Song, Cha Hwan Oh, Cha Hwan Oh, R. Niall Tait, R. Niall Tait, Pierre Berini, Pierre Berini, } "Active asymmetric plasmonic Bragg gratings", Proc. SPIE 9920, Active Photonic Materials VIII, 99201T (16 September 2016); doi: 10.1117/12.2238704; https://doi.org/10.1117/12.2238704
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