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Design and optimization of a high-efficiency nanoscale ±90° light-bending structure by mode selection and tailoring
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View: Figures


Image of FIG. 1.
FIG. 1.

Step-by-step design procedure to select modes appropriate for realizing light-bending. Values of are calculated for modes sustained by: (a) a GaP-filled slit in a planar Ag layer where the region above the slit is air and (b) a GaP-filled slit in the Ag layer where the top of the slit is coated with a layer of GaP and the region above the layer is air. [(c) and (d)] and [(e) and (f)] for plane-wave, SPP, and modes sustained in the slit and in the region above the slit.

Image of FIG. 2.
FIG. 2.

Selecting the light-bending structure parameters to yield high coupling efficiency. (a) plots the transverse distribution of the magnetic field intensity associated with the mode in a Ag–GaP–Ag waveguide formed by the slit for fixed parameters , , and . (b) plots the half-wavelength of the mode in the GaP layer as a function of the layer thickness. The dashed gray line indicates the lateral width of the mode in the slit. (c) depicts FDTD-calculated coupling efficiencies vs the GaP layer thickness at a fixed wavelength and the wavelength for a fixed GaP layer thickness .

Image of FIG. 3.
FIG. 3.

(a) Simulation geometry with detectors , , and used in the FDTD calculations. The detectors and measure the time-averaged magnetic field intensity, , of the mode in the GaP layer, and the detector measures radiated into the air region. (b) Snapshot of the instantaneous for normally-incident, free-space, TM-polarized illumination of the structure at . The inset in (b) is a magnified image of the mode emerging from the slit and splitting symmetrically into modes confined to the GaP layer.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Design and optimization of a high-efficiency nanoscale ±90° light-bending structure by mode selection and tailoring