Creation of spin relaxation prevention technology for optically pumped atoms by deuterated polymer film coating

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K05079
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Optical engineering, Photon science
• Research Institution: Kitasato University
• Principal Investigator: Kumagai Hiroshi 北里大学, 医療衛生学部, 教授 (00211889)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: 光ポンピング / 原子磁気センサ / アルカリ金属 / スピン緩和防止 / 原子層堆積 / ルビジウム

Outline of Final Research Achievements

An optical pumping atomic magnetometer using spin polarization of alkali metal atoms can be expected to have sensitivity exceeding SQUID at room temperature, so there is a possibility to monitor minute magnetic fields derived from the heart and cranial nerves even at the bedside. However, there is a problem that the polarized spin is relaxed when atoms collide with the inner wall of the cell. In this study, in order to minimize the effect of dipole-dipole interaction between the electron spin of the alkali metal atom and the nuclear spin of the atom in the coating, we focused on the deuterium nucleus with a small magnetic moment, The world's first molecular layer deposition method for deuterated polymer thin films was developed by developing the atomic layer deposition method based on the sequential surface chemical reaction developed in.

Free Research Field

医療電子工学

Academic Significance and Societal Importance of the Research Achievements

重水素化ポリマー膜コーティングとルビジウム原子の充填化を真空一貫で実現できるようにして重水素化ポリマー膜コーティング原子セルを作製し、スピン偏極緩和時間を計測する。表面原子とスピン偏極原子の相互作用を重水素置換率、膜厚、緻密度を変えて詳細に調べた。重水素化ポリマー膜コーティングの重水素置換率、膜厚、緻密度の最適化により、重水素化ポリマー膜コーティングによる光ポンピング原子磁気センサの感度向上を世界で初めて実証する。