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(Color) Example designs (A1, A2, A3) of mode-gap confined PCS nanocavities realized by waveguide width modulation. Basic line-defect widths of (W0.90) and (W0.98) were used in this study. Holes marked A, B, C are shifted by distances of , respectively, in the transverse direction (following the corresponding arrow).
(Color) (a) Resonant wavelength , value, and modal volume of a high- resonant mode of A1 obtained by FDTD as a function of hole shift . , , and were , , and , respectively. (b) Calculated structure and vertical magnetic field profile of the resonant mode of the cavity A1 for the plane in FDTD calculation. An intensity scale is provided at the bottom of the figure.
(Color) (a) A SEM top view of nanocavity sample A1 around the nanocavity. Transmission spectra measured for sample of A1 (b), A2 (c), and A3 (d). In (b), the black and red lines correspond to a reference (a PCS waveguide without a nanocavity) and the nanocavity, respectively. The solid blue line indicates a Lorentzian fitting to determine the linewidth shown in every figure. and mean loaded value and unloaded value, respectively.
(a) A design of a two-hole-shifted nanocavity. , slab thickness, and hole-shift were 420, 108, 204, and , respectively. (b) A transmission spectrum measured for a sample. The solid line shows a Lorentzian fitting of the plot.
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