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Modal characterization of nanophotonic waveguides for atom trapping

为原子套住的 nanophotonic 波导的形式的描述

作     者:Stievater, Todd H. Kozak, Dmitry A. Pruessner, Marcel W. Mahon, Rita Park, Doewon Rabinovich, William S. Fatemi, Fredrik K. 

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

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