arXiv 1601.013092016-01-06physics.optics

Towards nanoscale multiplexing with parity-time symmetric plasmonic coaxial waveguides

Hadiseh Alaeian, Brian Baum, Vladan Jankovic, Mark Lawrence, Jennifer A. Dionne

备注：: 11 pages, 11 figures
发表信息：: Phys. Rev. B 93, 205439 (2016)
DOI：: 10.1103/PhysRevB.93.205439

英文摘要：

We theoretically investigate a nanoscale mode-division multiplexing scheme based on parity-time (PT) symmetric coaxial plasmonic waveguides. Coaxial waveguides support paired degenerate modes corresponding to distinct orbital angular momentum states. PT symmetric inclusions of gain and loss break the degeneracy of the paired modes and create new hybrid modes without orbital angular momentum. This process can be made thresholdless by matching the mode order with the number of gain and loss sections within the coaxial ring. Using both a Hamiltonian formulation and degenerate perturbation theory, we show how the wavevectors and fields evolve with increased loss/gain and derive sufficient conditions for thresholdless transitions. As a multiplexing filter, this PT symmetric coaxial waveguide could help double density rates in on-chip nanophotonic networks.

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