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-PL spectra of (a) H0, (b) H1, and (c) L3 nanocavities for various lattice periods with . Cavity resonant modes were assigned based on FDTD calculations. SEM images of H0, H1, and L3 cavities are shown above the corresponding spectra. Arrows in the SEM images of H0 and L3 show the direction of shift in the air hole. Amount of shift is .
(a) Emission spectra of different cavity structures showing the cavity mode around the wavelength of 1135 nm. PL spectra obtained from a non-patterned area are also shown. For easy to see, spectra for the different cavities are shifted. (b) Polarization-resolved PL spectra for the H1 cavity. (c) Field distributions of the dominant electric field components and far-field radiation diagrams for the cavity modes. In the radiation diagrams, center circles express the collection angle for .
(a) Emitted mode intensity as a function of mode volume . (b) as a function of . Blue dashed line shows the dependence for reference. In both figures, the bars show the range of the experimental results for four samples with the same structure and balls indicate their averages.
Cavity characteristics for each mode [: resonant wavelength, : cavity mode volume, : vertical , : measured in experiments, and : lens collection efficiency. , , and were calculated by 3D-FDTD simulations].
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