Experimental research on higher-order interaction between cold atoms and localized light by optical near-field

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05234
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: Chuo University
• Principal Investigator: Tojo Satoshi 中央大学, 理工学部, 准教授 (30433709)
• Research Collaborator: SHIBATA Kosuke ; ABE Masashi
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 多重極子遷移増幅 / 光近接場 / レーザー冷却原子

Outline of Final Research Achievements

We research on higer order interaction between ultracold rubidium atoms and localized light by optical near-field. It is necessary to establish the observation system of higer-order interaction, namely optical forbidden transitions, of cold atoms near the dielectric surface. We succeed the observation of emission from trapped cold atoms via optical forbidden and optical-optical double resonant transitions. Due to change different wavelength of emission from excitations, the observed emission indicate to be improved signal-to-noise ratio in spite of weaker transition in serveral orders of magnetude in comparison with allowed ones. In view of theoretical reserach, we calculate transition probabilities of optical forbidden transitions near a nanoedge, and the results show highly enhancement of transisions in several orders of magnitude due to high-order interactions. In our experiment, we confirm several factor magnification of forbidden transitions of oxygen molecules near nano-edges.

Free Research Field

量子エレクトロニクス