Abstract
Recent advances in spatiotemporal structured light, particularly spatiotemporal optical vortices, have opened new opportunities for ultrafast optical field manipulation. However, most existing ultrafast pulse shaping techniques rely on conventional 4-f systems composed of multiple bulky optical components, which limits system compactness, integration capability, and flexibility. In this work, we propose a time-varying ultrafast holographic field generation approach based on spatial frequency multiplexed meta-holography. By encoding different holographic information into distinct high- and low-spatial-frequency channels within a single metasurface hologram, dynamic femtosecond holographic light fields with controllable temporal evolution can be generated. This strategy enables compact and integrated ultrafast holographic modulation while maintaining high temporal control precision. Experimentally, we demonstrate two representative ultrafast holographic fields: a femtosecond vortex beam with time-varying orbital angular momentum (OAM), and a femtosecond holographic image dynamically evolving between different letters over time. The experimentally observed temporal evolution agrees well with theoretical predictions. The proposed method provides a new route toward ultrafast spatiotemporal holographic field manipulation and may find promising applications in ultrafast optical information processing, optical communications, and integrated photonic systems.
Biography
Qizhen Wang is currently a postdoctoral researcher at the College of Physics and Optoelectronic Engineering, Shenzhen University. He received his PhD in Optical Engineering under the supervision of Prof. Xiaocong Yuan and is now conducting postdoctoral research with Prof. Changjun Min at the Institute of Micro and Nano Optoelectronics, Shenzhen University. His research focuses on micro/nano optics and ultrafast light field manipulation, particularly in structured light modulation and metasurface-based optical devices. He has published 6 first-author papers, including SCI journal articles, core Chinese journal papers, and international conference papers, and holds 2 related patents.
