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Scientists at The Pennsylvania State University (Penn State) developed a new type of optical metasurface that makes light reflect in one direction only. Leveraging both the spatial and temporal phase manipulation provided by an ultrathin nonlinear metasurface, the scientists experimentally demonstrated nonreciprocal light reflection at wavelengths around 860 nm. The new metasurface could advance the development of scalable, magnetic-free, nonreciprocal devices that can be integrated with other optical components.
Optical devices that support the unidirectional flow of light, such as isolators and circulators, are currently almost exclusively based on the magneto-optic effect, making the devices bulky and difficult to…READ MORE