Fig. 3.

Reconstruction procedures for off-axis geometry using the lensfree reflection DHM shown in Fig. 1 are described. (a) The raw off-axis lensfree reflection hologram of US-AFT. The interference fringes of off-axis geometry are shown in the expanded version of the yellow rectangular box. (b) Pixel interpolated and zero-padded reflection hologram. (c) Fourier spectrum of this reflection hologram, which includes spatial frequencies of the 0th order, real and twin images, as well as parasitic-reflections which are indicated by dashed arrows. (d) The reconstructed reflection hologram image over a large FOV of ~9 mm². (e) The digitally zoomed region specified with the small yellow rectangle in Fig. 3(d) is shown here, which demonstrates a spatial resolution of ≤2μm.