This work presents analytical, numerical and experimental demonstrations of light diffracted through a logarithmic spiral (LS) nanoslit, which forms a type of switchable and focus-tunable structure. Owing to strong dependence on the incident photon’s spin, the proposed LS-slit converges incoming light of opposite handedness (to that of the LS-slit) into a confined sub-wavelength spot, while it shapes light with similar chirality into a donut-like intensity profile. Benefitting from the varying width of the LS nanoslit, different incident wavelengths interfere constructively at different positions, i.e., the focal length shifts from 7.5 μm (at lambda = 632.8 nm) to 10 μm (at lambda = 488 nm), which opens up new opportunities for tuning and spatially separating broadband light at the micrometer scale.