Fig. 3: Optical simulations.
From: Ultrasonically sculpted virtual relay lens for in situ microimaging
a Parabolic refractive index profile of a conventional GRIN lens with a maximum contrast of Δn = 8.5 × 10−4 and b the simulated optical beam profile along the 30 mm length of the GRIN lens. c Ultrasonically sculpted refractive index profile (zeroth-order Bessel function) with the maximum contrast of Δn = 8.5 × 10−4 and d the simulated optical beam profile formed inside a 30 mm long piezoelectric transducer
