English

Progress has been made in the research of phase modulation of terahertz programmable metasurfaces based on free carrier plasmonic dispersion effect

1165
2024-07-26 14:33:32
See translation

Recently, the team of Situ Guohai and Guo Jinying from the Aerospace Laser Technology and Systems Department of the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, and the School of Microelectronics at Shanghai University collaborated to propose a terahertz phase controlled programmable metasurface design scheme based on free carrier plasma dispersion effect. The related research results were published in Applied Physics Letters under the title "Terahertz programmable metasurface for phase modulation based on free carrier plasma dispersion effect".

Terahertz modulators have broad application prospects in fields such as terahertz intelligent communication and computational imaging. However, existing terahertz phase modulators are not satisfactory in terms of speed, efficiency, and flux. Therefore, there is an urgent need to develop high-speed, efficient, and high-throughput terahertz spatial light modulators.

The research team proposed a terahertz programmable metasurface design scheme based on the free carrier plasmonic dispersion effect. By integrating the pn junction into the "H" - shaped metal metasurface unit structure and utilizing the change in external voltage to alter the carrier concentration distribution of the pn junction, continuous phase control at a frequency of 0.4 THz and 270 ° with an average efficiency of 30% were achieved in simulation. The metasurface unit adopts a "MIM" structure, and each unit is independently adjustable, while utilizing the high-speed switching characteristics of the pn junction, which is expected to achieve GHz level control speed. The team also demonstrated the far-field radiation results of the metasurface unit array, with a peak sidelobe ratio of 13dB, demonstrating excellent beam steering performance. The high-speed, efficient, and high-throughput advantages demonstrated by this design scheme in terahertz phase modulation are expected to play an important role in terahertz communication and imaging fields.

Figure 1. Schematic diagram of programmable metasurface unit structure and beam steering function

Figure 2. Continuous phase modulation of metasurface units under voltage

This research achievement has received support from the National Natural Science Foundation of China, the Shanghai Academic Research Leader Project, and the Shanghai Municipal Science and Technology Major Project.

Source: Shanghai Institute of Optics and Fine Mechanics

Related Recommendations
  • Xi'an Institute of Optics and Fine Mechanics has made significant progress in the field of metasurface nonlinear photonics

    Recently, the Research Group of Nonlinear Photonics Technology and Application in the Transient Optics Research Room of Xi'an Institute of Optics and Mechanics, Chinese Academy of Sciences has made important progress in the field of super surface nonlinear photonics. Relevant research results were published in Laser&Photonics Reviews (IF=9.8), the top journal of the first district of the Chine...

    04-30
    See translation
  • Swiitol Launches E24 Pro: A Breakthrough in Laser Engraving Technology

    In order to completely change the world of laser engraving, Swiitol has launched the E24 Pro, a 24W integrated laser engraving machine with cutting-edge features and functions. The Swiitol E24 Pro showcases an innovative integrated structure laser engraving machine made of durable aluminum alloy. It is worth noting that the device can be used out of the box without installation, providing users wi...

    2023-11-23
    See translation
  • LASIT's Laser Revolution: Illuminating the Path to a Greener Future

    In the breakthrough transformation towards sustainable industrial practices, LASIT is at the forefront of the ecological revolution in laser marking technology. This evolution is not just about labeling products; This is about marking a sustainable future.Environmental Innovation: A New Era of Industrial PrecisionLASIT's laser technology is a model of environmental protection. Unlike traditional m...

    2023-11-28
    See translation
  • Meltio launches a new blue laser 3D printer M600

    Recently, metal 3D printing manufacturer Meltio launched its latest metal 3D printer - M600. This M600 has shown significant progress in integrating into industrial manufacturing processes, no longer limited to niche applications. Like most of Meltio's product lines, the design of M600 was originally intended to address common manufacturing issues such as long delivery times, high inventory cost...

    2024-07-06
    See translation
  • Shanghai Institute of Optics and Fine Mechanics has made progress in the generation of third harmonic in laser air filamentation

    Recently, the team from the State Key Laboratory of Intense Field Laser Physics, Shanghai Institute of Optics and Mechanics, Chinese Academy of Sciences found that the third-order harmonics induced by air filamentation of high repetition rate femtosecond lasers have significant self jitter. To solve this bottleneck problem, a solution based on an external DC electric field was proposed, which sign...

    2024-10-10
    See translation