Metasurfaces

Engineers at the University of Minnesota have developed a new system that can move objects without making physical contact. The technique involves ultrasound waves acting on specialized surfaces to push or even pull objects in different directions, which could help in manufacturing and robotics.If you want to move something, you usually have to touch it, but in some cases where items are fragile or sensitive that’s not ideal. Contactless manipulation is a growing area of research into technologies that could impart a…

Chiral Quasi Bound States in the Continuum for High-Purity Circularly Polarized Light SourceScientists demonstrate high-purity, highly directional, and high-Q circularly polarized light source from spontaneous emission to laser.An ultra-compact circularly polarized light source is a crucial component for the applications of classical and quantum optics information processing. The development of this field relies on the advances of two technologies, quantum materials and chiral optical cavities.Disadvantages of…

Pump photons pass through a resonant metasurface and produce entangled photon pairs at different wavelengths. Credit: Santiago-Cruz et al., Science 377:6609, 991-995 (2022))Scientists have successfully created photon pairs at several different frequencies using resonant metasurfaces.Tomás Santiago-Cruz and Maria Chekhova from the Max Planck Institute for the Science of Light and the Friedrich-Alexander-Universität Erlangen-Nürnberg in cooperation with Sandia National Laboratories successfully used resonant metasurfaces to…

With the rapid advancement of technology, the manipulation of electromagnetic waves and information has become key to the modern lifestyle. This has called for the development of intelligent metasurfaces – those that do not require manual intervention to control wave-information-matter interaction. To this end, a group of researchers tried to study the development of intelligent metasurfaces with an eye to the future. They say intelligent metasurfaces can benefit the development of 6G wireless communications, green IoT,…