國立臺灣大學應用力學研究所吳政忠2006-07-262018-06-292006-07-262018-06-292005-07-31http://ntur.lib.ntu.edu.tw//handle/246246/21737經由兩種不同彈性材料組成之週期性 結構，在適當調整其材料常數及排列方式 後，通過之聲波有頻溝現象存在，此類結 構稱為聲子晶體(phononic crystals)。本計 畫旨在研究聲子晶體之頻溝現象，藉由建 立之電腦叢集針對彈性波之波導現象進行 討論，並延伸至彈性波於晶體結構內偏折 現象之分析，如一維通道、雙通道耦合等。 本計劃亦利用叢集電腦系統及平行化程式 進一步以有限差分法分析表面波之頻散關 係，並於具缺陷聲子晶體中之傳播行為進 行研究。實驗分析上，利用聲波耦合模態 設計一高頻表面聲波遲延器，做為測試聲 子晶體頻溝之激發與接收裝置。依據聲波 頻溝現象之分析，配合表面聲波濾波器之 設計，製作有限維度之聲子晶格(晶格尺吋 在數十微米等級)，驗證並分析其頻譜響 應。The purpose of this research is to study the characteristics of acoustic band gaps in two-dimensional phononic crystals. The phononic crystal is a kind of periodic elastic material structure that there are some band gaps in which the elastic wave propagation of particular frequency is forbidden. In this project, personal computer clusters were employed and adjusted to meet the requirements of RAM and CPU time. A parallel computer program based on the finite-difference time-domain (FDTD) method was developed and discussed. The FDTD program was then used to calculate the propagating phenomena of BAW and SAW modes in two-dimensional phononic crystals. In the experimental part, high frequency SAW device was fabricated and integrated to the phononic crystal to study the band-gap characteristics. Finally, the experimental results were compared with that of the numerical results, and the potential applications were also discussed.application/pdf877912 bytesapplication/pdfzh-TW國立臺灣大學應用力學研究所聲子晶體頻溝電腦叢集有 限差分法表面聲波聲波通道Phononic crystalsBand gapsClusterFinite-difference time-domainSAWWaveguidesreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/21737/1/932212E002025.pdf