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An on-chip hybrid plasmonic light steering concentrator with ∼96% coupling efficiency

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Abstract

We, for the first time, propose and theoretically study a plasmonic light steering concentrator (PLSC) that is based on a hybrid photonic–plasmonic sandwich structure. In this device, a transverse electric (TE) polarization guided mode supported by a silicon-on-insulator (SOI) waveguide is vertically coupled to a metal–dielectric–metal sandwich structure, while the structure steers the light to a perpendicular metal taper and focuses the light on the apex of the taper with a small radius of 15 nm. Based on the coupled-mode theory, the two supermodes (quasi-TM modes) are clarified to illustrate the coupling mechanism of the device. We numerically obtain over 96% coupling efficiency at the 1500 nm telecommunication wavelength, and the mode width supported by the apex is limited laterally within the range of ∼110 nm, where the field enhancement calculated is found to be more than 107 compared to that of light in the silicon waveguide.

Graphical abstract: An on-chip hybrid plasmonic light steering concentrator with ∼96% coupling efficiency

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Publication details

The article was received on 09 Jan 2018, accepted on 31 Jan 2018 and first published on 31 Jan 2018


Article type: Paper
DOI: 10.1039/C8NR00213D
Citation: Nanoscale, 2018, Advance Article
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    An on-chip hybrid plasmonic light steering concentrator with ∼96% coupling efficiency

    T. Zhang, M. Wang, Y. Yang, F. Fan, T. Lee, H. Liu and D. Xiang, Nanoscale, 2018, Advance Article , DOI: 10.1039/C8NR00213D

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