Fig. 4: Correction of spectro-angular dispersion for optimal volumetric resolution.
From: Exploiting volumetric wave correlation for enhanced depth imaging in scattering medium
a–e Reconstructed VRM (Volumetric Reflection Matrix) images for spectral bandwidth coverage \(\Delta {\lambda }_{F}\) of 15, 30, 60, 105, and 225 nm after spectro-angular dispersion correction, respectively. Scale bar, 5 \(\mu m\). f Reconstructed VRM images for \(\Delta {\lambda }_{{{{{{\rm{F}}}}}}}=225{nm}\) without dispersion correction. g–j Reconstructed images in experiments with broadband source whose \(\Delta {\lambda }_{{{{{{\rm{F}}}}}}}\) is the same as in a–d, respectively. Therefore, spectral dispersion could not be corrected. Color bar, normalized intensity by the maximum intensity in each image (intensity images). k Radial line plots of d (blue) and j (red) along the white line. l Output spectro-angular dispersion \({\phi }_{{{{{{\rm{o}}}}}}}\left({{{{{\bf{k}}}}}}{{{{{\boldsymbol{,}}}}}}\lambda \right)\) with respect to \(\lambda\) and \({{{{{\bf{k}}}}}}\) in the case of \(\Delta {\lambda }_{{{{{{\rm{F}}}}}}}=225{nm}\). Color bar, phase in radians. m Signal intensity of VRM (blue), signal normalized VRM (red) and BRM (Broadband Reflection Matrix, yellow) with respect to \(\Delta {\lambda }_{{{{{{\rm{F}}}}}}}\). n Intensity(circles) versus imaging depth. Line shows the Gaussian fit of data. Full width at half maximum is 0.6 \(\mu m\), which corresponds to depth resolution.
