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作者机构:US Naval Res Lab Washington DC 20375 USA US Army Res Lab Adelphi MD 20783 USA
出 版 物:《OPTICAL MATERIALS EXPRESS》 (光学材料快讯)
年 卷 期:2016年第6卷第12期
页 面:3826-3837页
核心收录:
学科分类:070207[理学-光学] 07[理学] 08[工学] 0805[工学-材料科学与工程(可授工学、理学学位)] 0803[工学-光学工程] 0702[理学-物理学]
基 金:Office of Naval Research Army Research Laboratory
主 题:Atom optics Guided waves Waveguides Nanophotonics and photonic crystals
摘 要:Nanophotonic waveguides are a promising platform to trap cold atoms using red-and blue-detuned evanescent-field optical dipole forces. The asymmetric structure of integrated waveguides leads to a large birefringence that is not encountered in cylindrically symmetric optical nanofibers. We have studied both theoretically and experimentally the modal properties and suitability of silicon nitride rib waveguides for cold-atom trapping. The dependence of the modal effective index on the rib width is explored experimentally by measuring beat lengths between propagating modes. These measurements are made using a novel spatial Fourier analysis technique based on conventional far-field imaging of elastic scattering from the waveguide. We find that the beat length between the lowest order TE00 and TM00 modes is approximately 5 mu m, in excellent agreement with numerical calculations. We propose to take advantage of this birefringence and mode structure to create novel, one-dimensional periodic trapping potentials for atoms within the evanescent field of the waveguide. (C) 2016 Optical Society of America