報告題目：Efficient Octave Spanning Super-continuum Generation from Ta2O5 based Nonlinear Waveguide
簡介：李晁逵 （Chao-Kuei Lee），臺灣中山大學（高雄）光電工程學系教授。2003年在臺灣交通大學（新竹）獲得博士學位， 2004年起，任教于臺灣中山大學（高雄），擔任光電工程學系飛秒與量子調控實驗室負責人，是物理系雙聘教授。主要從事超快量子電子學、二維材料、拓撲絕緣體、非線性光學、太赫茲光學的研究。主要研究方向是（1）利用脈沖激光技術，產生和表征超快光子信號，（2）太赫茲光子學，（3）二維材料的動態性質以及應用，（4）可用于硅基光子學和寬頻帶的相干光源，（5）非線性光波導的構筑和表征。在Science、Nature子刊等期刊發表SCI論文70余篇，平均每篇引用次數超過10。
摘要: To achieve high bit rate signal processing in the integrated optical system, the ultrafast all optical modulator is regarded as the key element in the modern optical communication system. Up to date, number of material systems, such as Si, SiO, SiN and so on, have been chosen for nonlinear optical processing in waveguide photonics fields. However, the physical limitation on application is on the inevitable linear or nonlinear absorption performance. Recently, a low-loss and high-Q Ta2O5 based micro-ring resonator is developed and presented. The micro-ring resonator and channel waveguide with core area of the 700 by 400 nm2 were fabricated on amorphous Ta2O5 thin films prepared by reactive sputtering with Q as high as 2x105. Meanwhile, the nonlinear refractive index of Ta2O5 waveguide at 1550 nm as high as 4 × 10?14 cm2∕W was also reported. In this work, the progress of nonlinear optical properties of low loss waveguide based on Tantalum Pentoxide (Ta2O5) will be introduced. The anomalous dispersion Ta2O5 based waveguide was designed and fabricated for super-continuum generation(SCG) due to its nature of two photon absorption free and high optical nonlinearity. The measurements show that SCG ranging from 585 to 1697 nm (at -30 dB) is obtained at a pumping wavelength of 1056 nm and the spectrum broadens at least 1.5 octaves. The pumping power of the aforementioned spanning result is 396 W, much lower than other materials for achieving the same SCG result that had been reported. In addition, the SCG from high order mode waveguide will be discussed as well.
Keywords： Ta2O5, Nonlinear waveguide, Super continuum