Microtrap on a concave grating reflector for atom trapping

doi:10.1088/1674-1056/25/8/087802

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.

Keywords: subwavelength structures high-contrast gratings beam focusing laser trapping

Received: 21 February 2016
Revised: 12 April 2016
Accepted manuscript online:

PACS:	78.67.Pt	(Multilayers; superlattices; photonic structures; metamaterials)
	92.60.Ta	(Electromagnetic wave propagation)
	87.80.Cc	(Optical trapping)
	37.10.Gh	(Atom traps and guides)

Fund: 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).

Corresponding Authors: Yong Xia
E-mail: yxia@phy.ecnu.edu.cn

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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) Microtrap on a concave grating reflector for atom trapping 2016 Chin. Phys. B 25 087802

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