The flexibility and active control of terahertz multi-focal focusing is essential for advancing next-generation terahertz communication systems.Here,we present and experimentally demonstrate a voltage-controlled liqui...The flexibility and active control of terahertz multi-focal focusing is essential for advancing next-generation terahertz communication systems.Here,we present and experimentally demonstrate a voltage-controlled liquid crystal(LC)integrated terahertz multi-focal metalens capable of dynamically reconfiguring focal configurations.Both simulation and experimental results confirm electrically modulated spatial-spin separation and multi-focal focusing within the 0.44–0.55 THz frequency band,exhibiting single-to-quadruple switching for left-handed circularly polarized(LCP)waves and dual-to-single transitions for right-handed circularly polarized(RCP)waves.The LC cascaded metalens achieves a measured full-width-at-half-maximum(FWHM)of<2.35 mm and a peak focusing efficiency of 70.4%.The normalized total output power of single,two,and four focal points exceeds 85.1%,54.9%,and 59.3%.The combination of spatial-spin separation and reconfigurable focus modes is expected to significantly increase the capacity and energy efficiency of future terahertz communication systems.展开更多
基金National Natural Science Foundation of China(62205160,624B2075,62371258,62175118,62335012,62435010)Natural Science Foundation of Tianjin Municipality(24JCYBJC01860)+1 种基金Young Scientific and Technological Talents in Tianjin(QN20230227)Fundamental Research Funds for the Central Universities,Nankai University(63253215).
文摘The flexibility and active control of terahertz multi-focal focusing is essential for advancing next-generation terahertz communication systems.Here,we present and experimentally demonstrate a voltage-controlled liquid crystal(LC)integrated terahertz multi-focal metalens capable of dynamically reconfiguring focal configurations.Both simulation and experimental results confirm electrically modulated spatial-spin separation and multi-focal focusing within the 0.44–0.55 THz frequency band,exhibiting single-to-quadruple switching for left-handed circularly polarized(LCP)waves and dual-to-single transitions for right-handed circularly polarized(RCP)waves.The LC cascaded metalens achieves a measured full-width-at-half-maximum(FWHM)of<2.35 mm and a peak focusing efficiency of 70.4%.The normalized total output power of single,two,and four focal points exceeds 85.1%,54.9%,and 59.3%.The combination of spatial-spin separation and reconfigurable focus modes is expected to significantly increase the capacity and energy efficiency of future terahertz communication systems.
