Tunable photonic crystals fabricated in III-V semiconductor slab waveguides using infiltrated liquid crystals

Schuller, Ch.; Klopf, F.; Reithmaier, J. P.; Kamp, M.; Forchel, A.
April 2003
Applied Physics Letters;4/28/2003, Vol. 82 Issue 17, p2767
Academic Journal
Microcavity structures formed by two-dimensional photonic crystal mirrors with triangular lattice and a crystal period of 280 nm suitable for transmission experiments at about 1 μm were fabricated in III-V semiconductor planar waveguides. The photonic crystals were filled with a liquid crystal of type E7. The wavelength of the resonance peak can be shifted by the temperature-dependent refractive index of the liquid crystal. The temperature shift follows the typical refractive index behavior of liquid crystals, with a jump in wavelength at the clearing point (about 60°C) and a continuous shift below. The wavelength jump is about 4 nm within a few Kelvin, while the total shift amounts to 9 nm between 20 and 70°C. The experimental results agree well with the calculated temperature dependent photonic band structure by assuming a preferential alignment of the liquid-crystal molecules parallel to the holes.


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