光在周期介電係數排列形成的非等向性光子晶體中，具有不同方向大小的群速度和相速度；且由於其較ㄧ般晶體戲劇性變化的色散曲線，當光自均勻介質入射時，微小的入射波長或角度變化可大幅度地改變群速度和相速度。我們利用對群速度和相速度的調制分別設計出群速度稜鏡和相速度稜鏡，並模仿傳統稜鏡的接力分光，將兩稜鏡組合以求得更高的波長解析。

為了減少稜鏡組合(邊界數目增加)造成的能量傳輸損耗，我們試著改變均勻介質和光子晶體間的邊界介電係數分佈，以提高光的穿透率或出射率。我們以有限元素分析法(finite-difference time domain method－FDTD)計算入射光在不同邊界時的穿透率，並討論因入射介質介電係數改變、晶體邊界介電係數分佈變化造成的晶體能帶位移和能隙擴大、穿透率大幅變化的現象。

實驗上，我們利用半導體製程技術蝕刻矽晶片堆疊成具不同邊界的矩形基元二維正方晶格光子晶體，並以pump-probe技術量測不同邊界光子晶體在兆赫頻段下的穿透率分佈；和模擬結果相同，我們看到當邊界改變時，第二能帶的穿透率會有明顯的變化。

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