2019年第80回応用物理学会秋季学術講演会

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一般セッション(口頭講演)

3 光・フォトニクス » 3.1 光学基礎・光学新領域

[18a-E204-1~11] 3.1 光学基礎・光学新領域

2019年9月18日(水) 09:00 〜 12:00 E204 (E204)

小澤 祐市(東北大)

10:45 〜 11:00

[18a-E204-7] Optical Spin-transfer Torque Calculated in Relation with Optical Chirality

〇(D)Anan Wu1、Yoshito Tanaka1,2、Ryoma Fukuhara1、Tsutomu Shimura1 (1.IIS, the Univ. of Tokyo、2.JST PRESTO)

キーワード:optical torque, optical chirality

Light-matter interaction can induce optical torque acting on the matter due to the transfer of angular momenta carried by the light, including the spin angular momentum (SAM) and the orbital angular momentum (OAM). The Maxwell stress tensor method is extensively used in calculating the optical torque based on the transfer of total angular momentum of SAM and OAM. In other words, this method is unable to separate the optical torques produced by the SAM and the OAM. Here, we introduce an important quantity, that is optical chirality, and reveal its relation to the SAM. Based on the relation, we propose a method to calculate the optical torque produced by the SAM separately from that by the OAM.