Related Experiment Video
Updated: Aug 14, 2025
09:33
Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
6.3K
Dual non-diffractive terahertz beam generators based on all-dielectric metasurface
Chunyu Liu1, Yanfeng Li2, Xi Feng1,3
1Center for Terahertz Waves, College of Precision Instrument and Optoelectronics Engineering, Key Laboratory of Optoelectronics Information and Technology (Ministry of Education of China), Tianjin University, Tianjin, 300072, China.
Frontiers of Optoelectronics
|January 13, 2023
Summary
This study introduces dual non-diffractive terahertz (THz) beam generators using metasurfaces. These devices create Bessel and abruptly autofocusing beams, enhancing THz applications in imaging and communications.
Area of Science:
- Optics and Photonics
- Metamaterials
- Terahertz Technology
Background:
- Non-diffractive beams are crucial for extending terahertz (THz) technology applications.
- All-dielectric metasurfaces offer a promising platform for advanced beam generation.
Purpose of the Study:
- To design and experimentally demonstrate dual non-diffractive THz beam generators.
- To generate two distinct non-diffractive beams: Bessel beams and abruptly autofocusing (AAF) beams.
- To explore the potential for orbital angular momentum (OAM) carrying capabilities.
Main Methods:
- Design of an all-dielectric metasurface.
- Experimental demonstration of THz beam generation.
- Characterization of generated Bessel and AAF beams.
- Numerical simulations to confirm OAM carrying potential.
Main Results:
- Successful generation of dual non-diffractive THz beams using a single metasurface.
- Demonstration of a Bessel beam with long-distance non-diffractive properties for x-polarized waves.
- Demonstration of an AAF beam with abrupt focusing for y-polarized waves.
- Experimental results show good agreement with simulations.
- Numerical analysis indicates the potential for OAM generation.
Conclusions:
- The developed metasurface-based beam generators offer versatile control over THz beam properties.
- These generators can produce beams with opposite focusing characteristics, expanding THz functionality.
- The potential for OAM generation further broadens their applicability.
- The technology holds significant promise for THz imaging, communications, and non-destructive evaluation.
