Fig. 4: Concentration of excitation light in non-contact mode.
From: Lipid droplets as endogenous intracellular microlenses
a Energy density distributions for an incident plane wave as the excitation light (wavelength: in 475 nm) without the lipid droplet (a1) and with the lipid droplets of 2 (a2), 10 (a3), and 20 μm (a4) diameters. b The focal length l as a function of the diameter D at the wavelength of 475 nm. c Energy density distributions along the observation lines indicated in (a)
