Phys.org   July 18, 2022 Current optical modulators used to manipulate the properties of a beam of light mainly use electrical or acoustic effects. These technologies can control the properties of light at nanosecond speeds. Researchers in Finland have developed an all-optical modulator technique which uses a coherent optical process. It can work at femtosecond speeds. They experimentally validated the concept in monolayer materials (MoS2) with modulation depth approaching ~100%, ultra-fast modulation speed (<~130 fs), and wavelength-independence features. The power and polarization of the incident optical beams can be used to tune the output chirality and modulation performance. According to the researchers […]