講演情報
[8p-A22-1][JSAP-Optica Joint Symposia Invited Talk] Surface plasmon-enhanced photonic spin Hall shifts
〇Cherrie May Olaya1, Norihiko Hayazawa1, Maria Herminia Balgos2, Takuo Tanaka1 (1.RIKEN, Japan, 2.Inst. for Basic Science, Republic of Korea)
キーワード：
photonic spin Hall effect、surface plasmon resonance
Photonic spin Hall effect (PSHE) is a spin-dependent transverse shift of light induced by spin-orbit interactions when a finite optical beam interacts with a planar interface. PSHE is manifested as a splitting of a linearly polarized incident beam into its spin components: left (LCP) and right (RCP) circularly polarized components, which experience transverse shifts in opposite directions. However, the resulting spin-dependent displacement is typically limited to the subwavelength scale, making direct measurement challenging. In this work, we demonstrate significant enhancement of PSHE at surface plasmon resonance in the Kretschmann configuration. Analytical calculations showed that beam focusing enhances the propagation-dependent angular PSHE contribution. Experimentally, after correcting for an additional Imbert-Fedorov shift induced by polarization deviations, opposite transverse shifts were observed for the LCP and RCP components. The maximum displacement reached approximately 37 μ m around the SPR angle, more than 30 times larger than the shift for a well-collimated beam. Our results demonstrate a direct route for PSHE measurement and provide an innovative approach towards spin-controlled nanophotonic application.