Tunable two-dimensional photonic crystals using liquid-crystal infiltration

被引:361
作者
Leonard, SW
Mondia, JP
van Driel, HM
Toader, O
John, S
Busch, K
Birner, A
Gösele, U
Lehmann, V
机构
[1] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada
[2] Univ Karlsruhe, Inst Theory Condensed Matter, D-76128 Karlsruhe, Germany
[3] Max Planck Inst Microstruct Phys, D-06120 Halle, Germany
[4] Infineon Technol AG, Corp Technol, D-81730 Munich, Germany
来源
PHYSICAL REVIEW B | 2000年 / 61卷 / 04期
关键词
D O I
10.1103/PhysRevB.61.R2389
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The photonic band gap of a two-dimensional photonic crystal is continuously tuned using the temperature dependent refractive index of a liquid crystal. Liquid crystal E7 was infiltrated into the air pores of a macroporous silicon photonic crystal with a triangular lattice pitch of 1.58 mu m and a band gap wavelength range of 3.3-5.7 mu m. After infiltration, the band gap for the H polarized field shifted dramatically to 4.4-6.0 mu m while that of the E-polarized field collapsed. As the sample was heated to the nematic-isotropic phase transition temperature of the liquid crystal (59 degrees C), the short-wavelength band edge of the H gap shifted by as much as 70 nm while the long-wavelength edge was constant within experimental error. Band structure calculations incorporating the temperature dependence of the liquid crystal birefringence can account for our results and also point to an escaped-radial alignment of the liquid crystal in the nematic phase.
引用
收藏
页码:R2389 / R2392
页数:4
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