Fig. 4: Controlling near-field angular momentum by shaping the far-field phase.
From: Dynamic control and manipulation of near-fields using direct feedback
a–f Near-field Bessel modes of order 1–6, respectively, all obtained using similar experimental conditions, i.e., the same coupling grating and polarization state. Insets show the corresponding phase patterns on the SLM, imprinted onto the illuminating beam at a wavelength of 1030 nm. The images show the clockwise-rotating in-plane component of the plasmonic vector field, obtained in real-time by NNOM with a left-handed circularly polarized pump beam (clockwise-rotating field)
