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-wavelength light guiding in waveguides in square-lattice-of-rod photonic crystal slab
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5.Magnetic field of this mode is mostly parallel to the slab plane, and the electric field is mostly parallel to the rods.
6.Oscillating structure of the spectra in Fig. 3 originated from the slight discontinuity of the rod-PC-slab waveguide, which occurred along its length at 80 μm intervals due to discontinuity in the electron-beam writing field.
7.Extinction ratio measured with a polarizer was 23 dB. We consider that the extinction ratio of the waveguide was worse than this principally due to imperfect coupling of the optical fibers to the waveguide; the calculated vertical radius of the TM-like guided mode was 0.73 μm, and the horizontal radius was as small as 0.24 μm.
8.Transmission spectrum for the TM-polarization light in Fig. 3 indicates a transmittance of −22.4 dB (0.575%), not −18.5 dB. This is because we used low coherence light for the measurement of the transmittance spectra in Fig. 3, while we used high coherence light to obtain the maximum transmittance.
9.For this calculation, we took into consideration only the field-profile overlap between the guided mode light of the waveguide and the focused light from the hemispherical-end optical fibers. The effect of the impedance mismatch was ignored. Therefore, we expect that the real input and output coupling losses were larger than the calculated ones.
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