Dhakal Ashim, Subramanian Ananth Z, Wuytens Pieter, Peyskens Frédéric, Le Thomas Nicolas, Baets Roel
Opt Lett. 2014 Jul 1;39(13):4025-8. doi: 10.1364/OL.39.004025.
We experimentally demonstrate the use of high contrast, CMOS-compatible integrated photonic waveguides for Raman spectroscopy. We also derive the dependence of collected Raman power with the waveguide parameters and experimentally verify the derived relations. Isopropyl alcohol (IPA) is evanescently excited and detected using single-mode silicon-nitride strip waveguides. We analyze the measured signal strength of pure IPA corresponding to an 819 cm⁻¹ Raman peak due to in-phase C-C-O stretch vibration for several waveguide lengths and deduce a pump power to Raman signal conversion efficiency on the waveguide to be at least 10⁻¹¹ per cm.
我们通过实验证明了用于拉曼光谱的高对比度、与CMOS兼容的集成光子波导的应用。我们还推导了收集到的拉曼功率与波导参数的关系，并通过实验验证了推导的关系。使用单模氮化硅条形波导对异丙醇（IPA）进行倏逝激发和检测。我们分析了对应于819 cm⁻¹拉曼峰（由于C-C-O同相伸缩振动）的纯IPA在几种波导长度下的测量信号强度，并推断出波导上泵浦功率到拉曼信号的转换效率至少为每厘米10⁻¹¹。
