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Research on the interaction between atoms and a dielectric surface by precise manipulation of cold atoms

Taro Mashimo

Published Oct 13, 2021• 0 citations
OpenAlex

Abstract

【学位授与の要件】中央大学学位規則第4条第1項 【論文審査委員主査】東條 賢（中央大学理工学部教授） 【論文審査委員副査】土屋 俊二（中央大学理工学部准教授）、脇田 順一（中央大学理工学部教授）、庄司 一郎（中央大学理工学部教授）、畠山 温（東京農工大学大学院教授）

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【学位授与の要件】中央大学学位規則第4条第1項 【論文審査委員主査】東條 賢（中央大学理工学部教授） 【論文審査委員副査】土屋 俊二（中央大学理工学部准教授）、脇田 順一（中央大学理工学部教授）、庄司 一郎（中央大学理工学部教授）、畠山 温（東京農工大学大学院教授）
Cold atomic ensembles offer precise tools for probing near-field interactions, yet experimental data linking atom dynamics to surface-induced forces remains limited. This study investigated the interaction between atoms and a dielectric surface using an atomic fountain measurement technique, in which cold rubidium atoms were released from a moving optical dipole trap. The launched cold atoms were irradiated with an evanescent light detuned from the D2_22​ transition by $-$20.2 to $+$20.2 MHz, after which they were recaptured by reactivating the optical dipole trap. Our measurements revealed that the number of recaptured atoms decreased with increasing flight time, and the decay was suppressed under blue-detuned conditions. We modeled the motion dynamics of the cold atomic ensemble, incorporating Casimir-Polder interactions between the dielectric surface and cold atoms, and observed that the rate of decrease in the number of residual atoms depended on the value of the van der Waals potential coefficient C3C_3C3​. The calculation results demonstrated good agreement with the experimental results, allowing us to estimate C3=5.6−1.9+2.4×10−49C_3 = 5.6^{+2.4}_{-1.9} \times 10^{-49}C3​=5.6−1.9+2.4​×10−49 Jm3^33 by comparing simulations with the experimental results across various C3C_3C3​ values, accounting for experimental errors.
Optical nanofibres are increasingly being used in cold atom experiments due to their versatility and the clear advantages they have when developing all-fibred systems for quantum technologies. They provide researchers with a method of overcoming the Rayleigh range for achieving high intensities in a focussed beam over a relatively long distance, and can act as a noninvasive tool for probing cold atoms. In this review article, we will briefly introduce the theory of mode propagation in an ultrathin optical fibre and highlight some of the more significant theoretical and experimental progresses to date, including the early work on atom probing, manipulation and trapping, the study of atom-dielectric surface interactions, and the more recent observation of nanofibre-mediated nonlinear optics phenomena in atomic media. The functionality of optical nanofibres in relation to the realisation of atom–photon hybrid quantum systems is also becoming more evident as some of the earlier technical challenges are surpassed and, recently, several schemes to implement optical memories have been proposed. We also discuss some possible directions where this research field may head, in particular, in relation to the use of optical nanofibres that can support higher-order modes with an associated orbital angular momentum.