  Artificial crystals such as moir\'e superlattices can have a real-space
periodicity much larger than the underlying atomic scale. This facilitates the
presence of Bloch oscillations in the presence of a static electric field. We
demonstrate that the optical response of such a system, when dressed with a
static field, becomes resonant at the frequencies of Bloch oscillations, which
are in the terahertz regime when the lattice constant is of the order of 10 nm.
In particular, we show within a semiclassical band-projected theory that
resonances in the dressed Hall conductivity are proportional to the lattice
Fourier components of the Berry curvature. We illustrate our results with a
low-energy model on an effective honeycomb lattice.
