2次元フォトニック結晶リング状共振器のマイクロ波モデル実験

摘要

For ring-like resonator in two-dimensional photonic crystal structure, the transmission characteristics with resonances were experimentally confirmed for microwave frequency. Measurement was done by using a model for frequency range from 3.6 to 4.2 GHz. Dielectric cylinders, which were made of ceramics, with diameter φ=7.5[mm], height h =29.1[mm], lattice period P=26.5[mm], and dielectric constant ε_r=36 around 4 GHz, were situated between ground and cover aluminum plates. Ring-like resonator was situated between a pair of straight waveguides as input/output ports, in which the separation distance between straight waveguides and a side of the resonator was one row of cylinder. First, in order to ensure that the microwave could be propagated along a waveguide, an isolated straight waveguide was measured. Next, we measured the ring-like resonator. Though transmission was observed along with straight input/output waveguide for almost all frequency range, typical frequencies which coupled to the resonator could not transmit through the straight output waveguide. Those typical signals were transmitted to output waveguides which were coupled by the resonator. The resonance frequency was well interpreted by wavelength in the waveguide, which were measured by first part of the experiment. By applying this characteristic, a circuit that separates the signal with specific frequency for wavelength division multiplexing (WDM) system can be composed.%現在，小型大規模集積回路の構成要素としてフォトニッタ結晶構造が注目されている.この構造を用いることで，異なる波長の波を取り出す周波数フィルタや，光の分岐型導波路を容易に構成することが可能となる.本報告では，三角格子構造を有するピラー型2次元フォトニック結晶を用いて，リング状共振器を構成し，3.6GHzから4.2GHzにおける共振特性の測定結果を示す.直線状導波路の横にリング状共振器を設置し，反射特性および透過特性の測定を行い，特定の周波数において透過量が減少することを確認した.