中国物理B ›› 2016, Vol. 25 ›› Issue (8): 87802-087802.doi: 10.1088/1674-1056/25/8/087802

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Microtrap on a concave grating reflector for atom trapping

Hui Zhang(张 慧), Tao Li(李涛), Ya-Ling Yin(尹亚玲), Xing-Jia Li(李兴佳), Yong Xia(夏 勇), Jian-Ping Yin(印建平)   

  1. 1 State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China;
    2 National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
  • 收稿日期:2016-02-21 修回日期:2016-04-12 出版日期:2016-08-05 发布日期:2016-08-05
  • 通讯作者: Yong Xia E-mail:yxia@phy.ecnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11374100, 91536218, and 11274114) and the Natural Science Foundation of Shanghai Municipality, China (Grant No. 13ZR1412800).

Microtrap on a concave grating reflector for atom trapping

Hui Zhang(张 慧)1, Tao Li(李涛)2, Ya-Ling Yin(尹亚玲)1, Xing-Jia Li(李兴佳)1, Yong Xia(夏 勇)1, Jian-Ping Yin(印建平)1   

  1. 1 State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China;
    2 National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
  • Received:2016-02-21 Revised:2016-04-12 Online:2016-08-05 Published:2016-08-05
  • Contact: Yong Xia E-mail:yxia@phy.ecnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11374100, 91536218, and 11274114) and the Natural Science Foundation of Shanghai Municipality, China (Grant No. 13ZR1412800).

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摘要： We propose a novel scheme of optical confinement for atoms by using a concave grating reflector. The two-dimension grating structure with a concave surface shape exhibits strong focusing ability under radially polarized illumination. Especially, the light intensity at the focal point is about 100 times higher than that of the incident light. Such a focusing optical field reflected from the curved grating structure can provide a deep potential to trap cold atoms. We discuss the feasibility of the structure serving as an optical dipole trap. Our results are as follows. (i) Van der Waals attraction potential to the surface of the structure has a low effect on trapped atoms. (ii) The maximum trapping potential is ~1.14 mK in the optical trap, which is high enough to trap cold 87Rb atoms from a standard magneto-optical trap with a temperature of 120 μK, and the maximum photon scattering rate is lower than 1/s. (iii) Such a microtrap array can also manipulate and control cold molecules, or microscopic particles.

关键词: subwavelength structures, high-contrast gratings, beam focusing, laser trapping

Abstract: We propose a novel scheme of optical confinement for atoms by using a concave grating reflector. The two-dimension grating structure with a concave surface shape exhibits strong focusing ability under radially polarized illumination. Especially, the light intensity at the focal point is about 100 times higher than that of the incident light. Such a focusing optical field reflected from the curved grating structure can provide a deep potential to trap cold atoms. We discuss the feasibility of the structure serving as an optical dipole trap. Our results are as follows. (i) Van der Waals attraction potential to the surface of the structure has a low effect on trapped atoms. (ii) The maximum trapping potential is ~1.14 mK in the optical trap, which is high enough to trap cold 87Rb atoms from a standard magneto-optical trap with a temperature of 120 μK, and the maximum photon scattering rate is lower than 1/s. (iii) Such a microtrap array can also manipulate and control cold molecules, or microscopic particles.

Key words: subwavelength structures, high-contrast gratings, beam focusing, laser trapping

中图分类号:  (Multilayers; superlattices; photonic structures; metamaterials)

  • 78.67.Pt
92.60.Ta (Electromagnetic wave propagation) 87.80.Cc (Optical trapping) 37.10.Gh (Atom traps and guides)