News

Electrically Tunable MetasurfaceMembers of the CPDS group have recently co-authored a paper on a liquid crystal based dynamically tunable metasurface for amplitude modulation.The metasurface consists of coupled subwavelength grating fingers, which provide alignment for the liquid crystal without the need for an additional alignment material or proc…

Electrically Tunable Metasurface in TN LC Configuration with Enhanced Quality Factor and Metaatom-Induced AlignmentDynamic metasurface with subwavelength dimensions has emerged as a key optical technology in recent years. Although various active tuning mechanisms are being proposed, liquid crystal-based dynamic metasurface remains attractive due to…

CPDS group are recruiting a Research Assistant/Associate in Optical Engineering to conduct research and  development on novel high- precision optical measurements in photonic devices, in particular, spatial light modulators with subpixel-accuracy hologram setting for precise beam steering, system design and implementation and performance benchmarki…

On August 6th 2024, we held our  annual summer barbecue. CPDS staff and student members, along with our guests enjoyed an afternoon by the River Cam  in the grounds of Darwin College. Thanks to Chris and Phoebe for expertly manning the barbecue. 

Non-Convex Optimization for Inverse Problem Solving in Computer-Generated HolographyComputer-generated holography is a promising technique that modulates user-defined wavefronts with digital holograms. Computing appropriate holograms with faithful reconstructions is not only a problem closely related to the fundamental basis of holography but also …

Prof Daping Chu was co-chair of the Light Conference 2024  held at the Northeast Asia International Conference Center in Changchun, China, from June 17 to 21, 2024. The Conference  was organised by leading optics journal Light: Science & Applications (LSA) and co-hosted by the Organizing Committee of the UNESCO International Day of Light, Changchun…

Revolutionising Dynamic Optical ControlIn the rapidly evolving field of optical engineering, the integration of metasurfaces with dynamic control elements remains a pivotal challenge. Wenhan Zhang, a researcher from the CPDS group, has fabricated a liquid-crystal Huygens metasurface, leading to an unprecedented level of phase modulation in these st…

Fast-Switching Reconfigurable Metadevice with Metasurface-Induced Liquid Crystal Alignment for Light Modulator ApplicationsMetasurface technology is progressing rapidly towards commercialization and productization, due to its unparallelled advantages over conventional optical solutions. The reconfigurable metasurface, exhibiting more flexibility an…

Dielectric Meta-Atoms with Liquid Crystal Alignment Effect for Electrically Tunable MetasurfaceDielectric metasurfaces with tunable functions are increasingly appealing to both the academia and industrial communities. Among the many tuning mechanisms reported so far, metasurface immersed in liquid crystal (LC) stands out as one of the most viable a…

On December 11th 2023, we held our  annual dinner. CPDS staff and student members, along with our guests enjoyed an excellent meal in the beautiful surroundings of St Catherine's College.

Polarimetric Calibrated Robust Dual-SLM Complex-Amplitude Computer-Generated HolographyLiquid crystal on silicon (LCoS) is a widely used spatial light modulator (SLM) in computer-generated holography (CGH). However, the phase-modulating profile of LCoS is often not ideally uniform in application, bringing about undesired intensity fringes. In this …

Increasing Steering Angle of LCoS in a WSS System Through Integration with a MetasurfaceLiquid crystal on silicon (LCoS) has been the dominant choice for wavelength selective switches (WSSs) in telecommunication industry due to its high spatial resolution and compatibility with software defined flexible grid feature. Current LCoS devices generally …

Phase Shift of Liquid Crystal-Induced Resonance Tuning in Dielectric Metasurface at Telecommunication WavelengthDuring the last decade, active metasurface has attracted significant attention from academia and industry because of its unparalleled advantages over conventional technologies. Active metasurface using electrically controlled liquid cryst…

Electrically Tuned Active Metasurface towards Metasurface-Integrated Liquid Crystal on Silicon (meta-LCoS) DevicesActive metasurfaces add a new dimension to static metasurfaces by introducing tunability, and this has received enormous attention from industry. Although various mechanisms have been proposed over the past few years in literature, solu…

On February 14th 2022, we held our delayed annual dinner, rescheduled to celebrate the Chinese New Year and coinciding with Lantern Festival. CPDS staff and student members, along with our guests enjoyed an excellent meal in the beautiful surroundings of Selwyn College Hall.