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SEM picture (top view) of a microcavity formed by two PC mirrors (triangular lattice in direction, crystal period 340 nm) with a mirror distance of 25 rows of holes inside a so-called W7 PC waveguide. The light propagates from left to right through the cavity.
Calculated transmission spectra of microcavities as a function of normalized frequency for (a) TE and (b) TM polarized light. The solid lines show spectra without LCs, the dotted lines with LCs. The measurable wavelength region of structures with lattice periods of 400 and 340 nm for TE (above) and TM (below) polarized light exhibit sharp resonances near the air band edge (highlighted gray).
Measured resonance wavelengths of the microcavities as a function of the temperature for (a) TE and (b) TM polarized light. The step like jump of the wavelength at the clearing point at about 60 °C is twice as much as for TM than for TE polarization.
Schematic view of the assumed escaped-radial alignment of the director field inside the holes at low temperatures.
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