2019/10/31 by Javad Shabanpour, Shabanpour, Javad, Sina Beyraghi +3
Materials Science · #Applied Physics (physics.app-ph) #FOS: Physical sciences #Metamaterials and Metasurfaces Applications
paper · pdf · doi:10.48550/arxiv.1910.14272
openalex publication_date 2019/10/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper, for the first time, a new generation of ultrafast\nreprogrammable multi-mission bias encoded metasurface is proposed for dynamic\nTHz wavefront engineering by employing VO2 reversible and fast monoclinic to\ntetragonal phase transition. The multi-functionality of our designed VO2 based\ncoding metasurface (VBCM) was guaranteed by elaborately designed meta-atom\ncomprising three-patterned VO2 thin films whose operational statuses can be\ndynamically tuned among four states of "00"- "11" by merely changing the\nbiasing voltage controlled by an external FPGA platform. Capitalizing on such\nmeta-atom design and by driving VBCM with different spiral-like and\nspiral-parabola-like coding sequences, single vortex beam and focused vortex\nbeam with interchangeable OAM modes were satisfactorily generated respectively.\nAdditionally, by adopting superposition theorem and convolution operation,\nsymmetric/asymmetric multiple beams and arbitrarily-oriented multiple vortex\nbeams in pre-demined directions with different topological charges are\nrealized. The versatility of our designed VBCM also has equipped a platform to\nfocus the incident THz wavefront into a pre-determined point which can be\ndynamically altered. Several illustrative examples successfully have clarified\nthat proposed VBCM is a promising candidate for solving crucial THz challenges\nsuch as high data rate wireless communication where ultrafast switching between\nseveral missions is required.\n