  We propose the concept of helicity maximization applicable to structured
light and obtain a universal rela-tion for the maximum of helicity density at a
given field energy density. We further demonstrate that us-ing structured light
with maximized helicity density eliminates the need of the specific knowledge
of en-ergy and helicity densities in determining the chirality of a
nanoparticle. The helicity maximization con-cept generalizes the use of the
dissymmetry factor in chirality detection to any chiral structure light
il-luminating nanoparticles.
