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Polarization-independent one-way transmission of silicon annular photonic crystal heterojunctions

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To realize the one-way transmission is a key point in optical integration. As a step to this goal, heterojunctions composed of two 2D square-lattice silicon annular photonic crystals are constructed… Click to show full abstract

To realize the one-way transmission is a key point in optical integration. As a step to this goal, heterojunctions composed of two 2D square-lattice silicon annular photonic crystals are constructed and expected to realize polarization-independent optical diodes. Band structures are calculated by the plane wave expansion method, and the transmission characteristics are analyzed using the finite-different time-domain method. The directional bandgap difference causes the one-way transmission behavior, and an overlapping one-way transmission frequency range for TE and TM modes is observed. Moreover, the transmission spectra, contrast ratio and field distributions for two polarizations demonstrate polarization-independent one-way transmission. The transmission performance is further enhanced and the equal forward transmittance for two polarizations reaches 45%.

Keywords: transmission; one way; polarization independent; way transmission

Journal Title: AIP Advances
Year Published: 2018

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