2020/09/03(Thu) 11:00 -12:00 五樓第一會議室 5F, 1st Meeting Room
Title
黑磷光電元件於中紅外線矽光子之應用
Black phosphorus optoelectronics for mid-infrared silicon photonics
Speaker
劉昌樺助理教授 (國立清華大學光電工程研究所) Dr. Chang-Hua Liu (Institute of Photonics Technologies, National Tsing Hua University)Abstract
Black phosphorus (BP) is an emerging material for mid-infrared optoelectronics, as it owns a direct and narrow band gap (∼0.3 eV in bulk). In addition, because of its van der Waals (vdW) nature, BP based optoelectronics can be easily integrated onto diverse substrates or photonic structures, making them promise for mid-infrared integrated photonics applications. Here, we will outline the architectures of photodetectors using BP based van der Waals (vdW) heterostructures. The performed photodetectors not only can exhibit the features of linear-dichroic, broadband (visible to mid-infrared), high external quantum efficiency and fast operation speed (> 200 MHz) at room temperature, but also can be coupled with a silicon waveguide. Furthermore, we will demonstrate light emitting diodes based on the BP heterostructures, which can emit linearly polarized light (degree of polarization ~75 %) with the emission spectra cover the technologically important mid-infrared atmospheric window (3-4 µm). Via integrating the BP emitter with a silicon waveguide, we further show that its emission can evanescently couple and propagate through the waveguide, showing the usefulness for on-chip mid-infrared light source applications.
Language
演講語言 (Language): in English