Experimental Studies on Sonic-Crystal Defect-Mode Waveguides Composed of a Periodic Chain of Single-Defects

单缺陷周期链组成的声晶体缺陷模波导的实验研究

基本信息

批准号：
18360176
负责人：
MIYASHITA Toyokatsu
金额：
$ 5.82万
依托单位：
Ryukoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

We have obtained the following results according to the purpose and plan of the research described in the application documents. In this report, a waveguide composed of a periodic chain of single-defects, or point-defects, are called a defect-mode waveguide.(1) Two methods to analyze the temporal and frequency characteristics of defects in an artificial crystal, namely, an internal excitation method which investigates them by exciting impulse, or burst sound pressure in a defect, and an external method by an excitation of a defect from the outside of the crystal.(2) Spatial confinement and frequency characteristics of a single-defect, or point-defect, embedded in a sonic crystal are investigated by both the external and internal methods, and the theoretical and experimental results had a good coincidence.(3) Temporal responses and frequency characteristics of two adjacent single-defects, which compose elementary parts of defect-mode waveguides, are investigated by FDTD simulations of t … More he wave propagation, by experimental external excitation method and by a coupled-mode theory. Well quantitatively agreed results indicated validity of the three methods.(4) Straight waveguides with and without a sharp bend composed of a chain of single defects proved to have a good 100% transmission in the pass-band by means of a FDTD simulation and an experimental external excitation.(5) Transmission characteristics of long defect-mode waveguides, which have a sharp bend and a branch or a crossroads, were measured by the ultrasonic waves of a frequency of 20〜40 kHz in air. The following items were confirmed, namely their high transmission per lattice constant in the pass band, and a high suppression in the forbidden band outside the pass band, and a good branching characteristics.(6) A high 50% mode coupling was obtained between a straight defect-mode waveguide and a neighboring defect-mode waveguide which has a sharp bend to remove from the former waveguide.(7) We have established a new coupled-mode theory which describes the behaviors of an arbitrary number of coupled modes of a chain of defect-modes. Quantitative preciseness of the results deduced by this theory was confirmed by the FDTD simulation and the experimental results described above. Less

我们根据申请文件中描述的研究的目的和计划获得了以下结果。在本报告中，由周期性的单被告或点 - 缺陷链组成的波导称为缺陷模式波导。（1）两种分析人工晶体中缺陷的临时和频率特征的方法，即人工晶体中的暂时性和频率特征，不，即，内部兴奋的方法通过令人兴奋的触发或外部的启发，或者通过一种触发或爆发的方式进行冲突，或者在某种程度上进行了侵害，或者是在某种程度上进行造成的污染，或者是在某种程度上进行造成的侵害，并且是一种造成的突发性，或者是在某种情况下进行侵害，并且是一种缺陷，或者是在某种程度上进行的，或者是在某种情况下进行侵害，并且是一种造成的突发性。（2）通过外部方法和内部方法和理论和实验结果既相当cysect。他通过实验性的外部兴奋方法和耦合模式理论挥舞传播。（4）通过有或没有急转弯的直轴指示的有效性。（4）通过fdtd模拟和实验性的外部兴奋，有和没有急转弯的弯曲，由单个缺陷链组成，在传球中具有良好的100％传播。（5）（5）逐渐弯曲的频率或分支的频率均匀弯曲的频率，该频率是一定的频率，这些频率是一定的，该频率是一定的，该频率是一定的，该频率是一定的，该频率是一定的，该频率是一定的，该频率是一定的，该频率是一定的，该频率是一定的，该频率是一定的，该频率是一定的，该频率是一定的，该频率是一定的，该频率是一定的，该频率是远远弯曲的，远远超出了一定的频率。在空中20-40 kHz。确认了以下项目，即在传球带中的每个晶格常数高传输，以及在传球带外的禁忌频带中的高抑制作用，并具有良好的分支特征。（6）在直型缺陷模式下获得了高50％模式的耦合，并且在邻近的缺陷模式之间获得了一个敏锐的弯曲，该弯曲弯曲的弯曲是从以前的warkguide中删除了（7），我们已经建立了一个新的capguide。缺陷模式链的任意数量耦合模式的行为。 FDTD模拟和上述实验结果证实了该理论推论的结果的定量精度。较少的