  The superposition of several optical beams with large mutual angles results
in sub-micrometer periodic patterns with a complex intensity, phase and
polarization structure. For high-resolution imaging thereof, one often employs
optical super-resolution methods such as scanning nano-particle imaging. Here,
we report that by using a conventional arrayed image sensor in combination with
2D Fourier analysis, the periodicities of light fields much smaller than the
pixel size can be resolved in a simple and compact setup, with a resolution far
beyond the Nyquist limit set by the pixel size. We demonstrate the ability to
resolve periodicities with spatial frequencies of ~3/$\mu$m, 15 times higher
than the pixel sampling frequency of 0.188/$\mu$m. This is possible by
analyzing high-quality Fourier aliases in the first Brillouin zone. In order to
obtain the absolute spatial frequencies of the interference patterns, we show
that simple rotation of the image sensor is sufficient, which modulates the
effective pixel size and allows determination of the original Brillouin zone.
Based on this method, we demonstrate wavelength sensing with a resolving power
beyond 100,000 without any special equipment
