由於我們超導實驗室利用不同成長條件可長出不同平面晶向的YBCO，為了瞭解這些樣品有何不同，我們利用波長800nm的超快脈衝雷射來研究在室溫下不同平面晶向的超導薄膜YBCO的光學反應，實驗總共分為三個部份，(1) 兆赫波時域光譜(THz-Time Domain Spectroscopy, THz-TDs)；(2) 光激發-兆赫波探測(Optical pump-THz probe, OPTP)；(3) 同色光激發-探測(Optical pump-probe)，第一部份的實驗則是得到不同平面晶向的YBCO有不同的折射率，進而去推算介電常數與電導率並得到0度平面晶向的YBCO較45度平面晶向更具金屬性。在第二部份及第三部份的探測-激發實驗中，我們得到探測光的能量分別在4.1meV & 1.55eV對YBCO有不同反應，在1.55eV的探測光情況下是有帶間躍遷的發生，兆赫波因為能量極低所以不容易產生載子躍遷行為。不同平面晶向的YBCO對兆赫波探測的反應也有差異，例如在45度平面晶向的情況中，訊號就有負的指數衰減，而0度平面晶向的樣品卻無此現象，因此這些不同的樣品被光激發後的瞬時載子鬆弛行為與能帶間的躍遷機制是可被討論與分析的。

We utilized 800nm pulse laser to study the optical properties of YBCO with different in-plane orientations. There are three parts in this experiment. (1) THz-Time Domain Spectroscopy (THz-TDS). (2) Optical pump-THz probe (OPTP) measurement. (3) Optical pump-probe. In first part of experiment, we study the conductivity of YBCO with different in-plane orientations, and conclude that the 0 degree in-plane orientation film is more metallic. The results are quite different with different probe beam energy (4.1meV & 1.55eV) in second and third part of experiment. We use these results to analyze the carrier dynamics of YBCO with different in-plane orientations.

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