激光与光电子学进展, 2017, 54 (7): 071901, 网络出版: 2017-07-05
基于双非线性硒化锌晶体的局域空心光束产生
Generation of Localized Hollow Beam Based on Bi-Nonlinear ZnSe Crystals
非线性光学 局域空心光束 硒化锌晶体 纵横比 囚禁 nonlinear optics localized hollow beam ZnSe crystals aspect ratio trapping
摘要
提出了采用双非线性硒化锌(ZnSe)晶体将高斯光束整形成局域空心光束(LHB)的新方案,根据惠更斯-菲涅耳衍射理论计算了不同厚度的ZnSe晶体和不同束腰半径的高斯光束条件下产生的LHB的强度分布和暗斑尺寸。结果表明,该方案产生的LHB强度分布形状为空心椭球体,在传播方向上的二维强度呈中心对称分布。利用数值计算获得了所产生的LHB暗斑的纵横比,发现纵横比随着入射高斯光束束腰半径的增大呈线性增大。该方案产生的LHB的参数可以被灵活调节,因此所产生的LHB可应用于一些较大尺寸的原子分子、生物分子和介质粒子等的光学非接触式囚禁与操控。
Abstract
A new scheme to generate localized hollow beam (LHB) reshaped by Gaussian beam with bi-nonlinear ZnSe crystals is proposed. According to Huygens-Fresnel diffraction theory, the intensity distribution and dark-spot size of generated LHB in the conditions of ZnSe crystals with different thicknesses and Gaussian beams with different waist radii are calculated. The results show that the intensity distribution shape of LHB is a hollow ellipsoid, and the two-dimensional intensity in the propagation direction shows symmetrical distribution along the center. The aspect ratio of dark spot of generated LHB is obtained by numerical calculation, and it is found that the aspect ratio increases linearly with the increase of waist radius of the incident Gaussian beam. The parameters of generated LHB can be adjusted flexibly, and the generated LHB can be applied to the optical non-contact trapping and the manipulation of atoms and molecules, biomolecules as well as insulating particles with larger size.
王志章, 任瑞敏, 夏梦, 夏勇, 尹亚玲, 印建平. 基于双非线性硒化锌晶体的局域空心光束产生[J]. 激光与光电子学进展, 2017, 54(7): 071901. Wang Zhizhang, Ren Ruimin, Xia Meng, Xia Yong, Yin Yaling, Yin Jianping. Generation of Localized Hollow Beam Based on Bi-Nonlinear ZnSe Crystals[J]. Laser & Optoelectronics Progress, 2017, 54(7): 071901.