Wang Chun-Chih, Chen Lien-Wen
Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan.
Appl Opt. 2010 Jun 20;49(18):3452-7. doi: 10.1364/AO.49.003452.
We propose a tunable directional coupler based on a two-dimensional photonic crystal made of dielectric elastomer rods embedded in air background. In the interaction region, the inclusions are a dielectric elastomer cylindrical actuator made of a hollow cylinder sandwiched between two compliant electrodes. By applying a voltage between the compliant electrodes, the radial strain of the silicon-made actuator and the coupling characteristics of the photonic crystal coupler are investigated. The coupling length of the photonic crystal coupler depends on the voltage applied between the electrodes, which is analyzed by the plane wave expansion method. Due to the radial strain of the dielectric elastomer under external voltage, the tunable photonic crystal coupler is realized. Numerical simulations obtained by the finite-difference time-domain method confirmed the feasibility of the tunable photonic crystal coupler.
我们提出了一种基于二维光子晶体的可调谐定向耦合器，该光子晶体由嵌入空气背景中的介电弹性体棒制成。在相互作用区域，内含物是一个由夹在两个柔性电极之间的空心圆柱体构成的介电弹性体圆柱形致动器。通过在柔性电极之间施加电压，研究了硅制致动器的径向应变以及光子晶体耦合器的耦合特性。光子晶体耦合器的耦合长度取决于电极之间施加的电压，这通过平面波展开法进行分析。由于介电弹性体在外部电压下的径向应变，实现了可调谐光子晶体耦合器。通过时域有限差分法获得的数值模拟证实了可调谐光子晶体耦合器的可行性。
