Phys.org  November 22, 2021 Currently, the two most suitable materials are silicon nitride and lithium niobate. While both are highly transparent in the visible range, neither one provides very much tunability. A team of researchers in the US (Columbia University, Tufts University) developed a way to dramatically reduce both the size and the power consumption of a visible-spectrum phase modulator, from 1 mm to 10 microns and from tens of mW for π phase tuning to below 1 mW. The key to their solution was to use an optical resonator and to operate it in the strongly over-coupled regime. In […]