Twistoptics: A new way to control optical nonlinearity

Engineering researchers report that they developed a new, efficient way to modulate and enhance an important type of nonlinear optical process: optical second harmonic generation -- where two input photons are combined in the material to produce one photon with twice the energy -- from hexagonal boron nitride through micromechanical rotation and multilayer stacking. Their work is the first to exploit the dynamically tunable symmetry of 2D materials for nonlinear optical applications.

from Top Technology News -- ScienceDaily https://ift.tt/3c4OApJ