École Polytechnique Fédérale de Lausanne (EPFL), Institute of Electrical Engineering, STI-GR-SCI-LT Station 11, Lausanne 1015, Switzerland.
Opt Lett. 2012 Dec 1;37(23):4934-6. doi: 10.1364/OL.37.004934.
High-resolution infrared absorption spectroscopy of acetylene gas is demonstrated in a dispersion-engineered photonic crystal waveguide under slow-light propagation. Experimental enhancement factors of 0.31 and 1.00 are obtained for TE and TM polarization, respectively, for group indices ranging from 1.5 to 6.7. The dependence of molecular absorption on the evanescent electric-field distribution and on the group index under structural slow-light illumination is experimentally demonstrated and confirmed by time-domain simulations.
在慢光传播条件下，于色散调控光子晶体波导中实现了乙炔气体的高分辨率红外吸收光谱。对于群折射率在 1.5 到 6.7 范围内，实验分别获得了 0.31 和 1.00 的 TM 和 TE 偏振增强因子。实验演示并通过时域模拟证实了分子吸收与倏逝电场分布和结构慢光照明下的群折射率的依赖关系。
