This ultra-thin surface controls light in two completely different ways
The achromatic lens can focus the incident RCP and LCP light onto two distinct positions without chromatic aberration over a wide bandwidth. Credit: School of Electronic Science and Engineering, Nanjing University Broadband achromatic wavefront control is a key requirement for next-generation optical technologies, including full-color imaging and multi-spectral sensing. Researchers led by Professor Yijun Feng and Professor Ke Chen at Nanjing University have now reported a major advance in this area in PhotoniX. Their work introduces a hybrid-phase cooperative dispersion-engineering approach that brings together Aharonov-Anandan (AA) and Pancharatnam-Berry (PB) geometric phases within a single-layer metasurface. This combination makes it possible to achieve independent achromatic control of light with two different spin states. Dispersion is a fundamental property of electromagnetic waves. While it enables useful wavelength-dependent effects, it also causes chromatic aberrations that become more severe as bandwidth increases. These effects can shift steering angles, move focal points, and reduce spatial accuracy. Metasurfaces, which are flat structures made from carefully designed arrays of subwavelength meta-atoms, offer a powerful way to shape light. However, most existing achromatic metasurface designs are limited in practice to a single spin channel. In other cases, both spin channels are addressed but forced to share the same dispersion behavior. As a result, fully independent control of phase and group delay for both spins within a compact device has remained difficult, even though it is essential for multi-channel and multiplexed optical systems.
Nomination link: https://researchawards.net/award-nomination-ecategoryawardsrcategoryawardee/?ecategory=Awards&rcategory=Awardee
Visit Our Website : researchawards.net
Contact Us : info@researchawards.net
Comments
Post a Comment