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Photonics Global Conference

Optically trapping cold atoms by using a silicon nanopillar

Do T. Nga, Chu Thuy Anh, Nguyen Tri Lan, Nguyễn Ái Việt

Published Dec 1, 2012• 1 citation
Publisher

Abstract

A new optical trapping model for cold atoms using a nanopillar is proposed. A strong electromagnetic wave is sent to the pillar to creat the existence of a stable bound state of cold atom. An evanescent wave is generated around the pillar and creates an effective attractive potential. The result will be compared to some recent trapping models.

DOI
10.1109/pgc.2012.6457989

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A new optical trapping model for cold atoms using a nanopillar is proposed. A strong electromagnetic wave is sent to the pillar to creat the existence of a stable bound state of cold atom. An evanescent wave is generated around the pillar and creates an effective attractive potential. The result will be compared to some recent trapping models.
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We suggest a new schema of trapping cold atoms using a two-color evanescent light field around a carbon nanotube. The two light fields circularly polarized sending through a carbon nanotube generates an evanescent wave around this nanotube. By evanescent effect, the wave decays away from the nanotube producing a set of trapping minima of the total potential in the transverse plane as a ring around the nanotube. This schema allows capture of atoms to a cylindrical shell around the nanotube. We consider some possible boundary conditions leading to the non-trivial bound state solution. Our result will be compared to some recent trapping models and our previous trapping models.
Abstract This paper reports on conceptual and experimental work towards the realization of plasmonic surface traps for cold atoms. The trapping mechanism is based on the combination of a repulsive and an attractive potential generated by evanescent light waves that are plasmonically enhanced. The strength of enhancement can be locally manipulated via the thickness of a metal nanolayer deposited on top of a dielectric substrate. Thus, in principle the trapping geometry can be predefined by the metal layer design. We present simulations of a plasmonic lattice potential using a gold grating with sinusoidally modulated thickness. Experimentally, a first plasmonic test structure is presented and characterized. Furthermore, the surface potential landscape is detected by reflecting ultracold atom clouds from the test structure revealing the influence of both evanescent waves. A parameter range is identified where stable traps can be expected.
When a laser Bessel beam light is totally reflected internally at the planar surface of a dielectric on which a thin film has been deposited, a surface plasmons with phase singularities can be produced. This two-dimensional plasmons lead to an attractive potential with enhancement. Using this effect, we construct a model for optical trapping cold atoms. Efficiency of the trap will be presented by an ellipse with average radius r in the ( x , y ) directions and the distance d from planar surface in the z -direction.
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