Minimizing the Bright/Shadow Focal Spot Size with Controlled Side-Lobe Increase in High-Numerical-Aperture Focusing Systems

Table 5

Results of numerical simulation for “+”-polarization in the presence of a first-order optical vortex (𝑚=1).

Transmission function, 𝐵(𝜃,𝜙)	Transverse intensity pattern in the focus, 3𝜆×3𝜆 (total and z-component)	Transverse intensity profile: total (solid line) and 𝑧-component (dashed line)
exp(𝑖𝜙)	FWHM = 0.436λ; FWHMz = 0.74λ
ring(𝜃)exp(𝑖𝜙),; 𝛿=0.05𝑅	FWHM = 0.457λ;FWHMz = 0.59λ
𝜌𝜀=0.2𝜆,; 𝜌Δ=𝜆, 𝜇=0.3	FWHM = 0.38λ; FWHMz = 0.66λ