Optics & Photonics Technology Laboratory, Ecole Polytechnique Fédérale de Lausanne, Breguet 2, 2000 Neuchâtel, Switzerland. yu‑
Opt Lett. 2012 Jul 15;37(14):2883-5. doi: 10.1364/OL.37.002883.
Mid-infrared photonics in silicon needs low-loss integrated waveguides. While monocrystalline germanium waveguides on silicon have been proposed, experimental realization has not been reported. Here we demonstrate a germanium strip waveguide on a silicon substrate. It is designed for single mode transmission of light in transverse magnetic (TM) polarization generated from quantum cascade lasers at a wavelength of 5.8 μm. The propagation losses were measured with the Fabry-Perot resonance method. The lowest achieved propagation loss is 2.5 dB/cm, while the bending loss is measured to be 0.12 dB for a 90° bend with a radius of 115 μm.
硅基中红外光子学需要低损耗的集成波导。虽然已经提出了在硅上的单晶锗波导，但尚未有实验实现的报道。在这里，我们展示了一种在硅衬底上的锗条形波导。它设计用于传输横磁（TM）偏振的光，由波长为 5.8 μm 的量子级联激光器产生。传播损耗是用法布里-珀罗共振法测量的。所达到的最低传播损耗为 2.5 dB/cm，而对于半径为 115 μm 的 90°弯曲，弯曲损耗测量值为 0.12 dB。
