[17a-WL2_301-1~11] 3.1 Basic optics and frontier of optics

9:15 AM - 9:30 AM JST(12:15 AM - 12:30 AM UTC)

[17a-WL2_301-2] Longitudinal Electric Field Enhancement of Thin-Annular Radially Polarized Beams at Dielectric Interfaces via Total Internal Reflection

Wenqi Wang^1,2, Yuuki Uesugi², 〇Yuichi Kozawa² (1.Grad. Sch. of Eng., Tohoku Univ., 2.IMRAM, Tohoku Univ.)

Keywords:

Radial polarization,Longitudinal electric field,Vector diffraction theory

High-NA focusing of a radially polarized beam is known to generate a sharp focal spot dominated by a longitudinal electric field. This longitudinal field can be significantly enhanced compared to the transverse component under total internal reflection, specifically when focusing from a high- to a low-refractive-index medium. Here, we report on the focusing conditions required to efficiently generate the longitudinal electric field at such interfaces, based on numerical simulations.