Fig. 2: Comparison between the simulated time-shift signal and the measured time-shift signal at a volume concentration of 0.14%. (size of colloidal particle =320±30 nm; droplet refractive index= 1.3431; colloidal particle refractive index= 1.6268; wavelength of laser beam=405 nm; polarization state of the laser beam is s polarization, beam waist 4 μm).