講演情報
[19p-A602-3]Transverse spin angular momentum of space-time surface plasmon polaritons
〇Atsushi Kubo1, Naoki Ichiji1,2, Daigo Oue3, Murat Yessenov4, Kenneth L. Schepler4, Ayman F. Abouraddy4 (1.Univ. of Tsukuba, 2.The Univ. of Tokyo, 3.Univ. of Lisbon, 4.CREOL, Univ. of Central Florida)
キーワード：
surface plasmon、angular momentum of light、structured light
Spatially structured electromagnetic fields such as surface plasmon polaritons (SPPs) possess transverse spin angular momentum (t-SAM) in the direction perpendicular to the axis of propagation. In this work, we numerical calculated the SAM distribution of the space-time surface plasmon polariton (ST-SPP) wave packet (WP), a plasmonic bullet that propagates at an arbitrary group velocity while maintaining its spatial distribution. The out-of-plane component of the t-SAM which appear at the center of the ST-SPP WP is framed by L-lines that forms a series of split rings. The distribution of the t-SAM and the L-line maintains even after the WP propagation more than twice the SPP attenuation length. This suggests the ST-SPP WP can provide robust and group-velocity tunable transportations of three-dimensional spin textures on material surfaces.