Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
FPT quantitatively measures refractive index in 3D. (a) Tomographic reconstruction of 12 μm microspheres in oil with lateral (Δz = 0) slice on left, axial (Δy = 25 μm) slice on right, and one-dimensional plots of index shift along both x and z. (b) Digitally propagated FP reconstruction (middle) and refocused light field (right) created from the same data. FPT (left) best matches the expected spherical bead profile.
