Is There a Fundamental Limit to Spatial Resolution in Phase Microscopy? - Biomedical Optical Phase Microscopy and Nanoscopy - page 334

Figure 16.2
Moir´ fringes are produced by the superposition of two gratings with different spatial frequencies.
(A) Similar fringes are produced when the image frequency is larger or smaller than the grating by
the same amount but (B) these can be distinguished by shifting the grating (changing its phase)
with respect to the image. Source: After Lipson et al. [11] .

Figure 16.3
Optics of SIM illumination [23] . (A) Laser illumination and (B) frequency plane coverage using
three different grating orientations with k g 5 k m . Each image is recorded with three different

phases of the illumination pattern created by linear translation of the grating.