|
1
|
Zhang Y, Hou B, Yang Y, Song Q, Yi Z, Zhou Z. An active controllable wide-angle and ultra-wideband terahertz absorber/reflector based on VO 2 metamaterial. Phys Chem Chem Phys 2024; 26:6091-6098. [PMID: 38299724 DOI: 10.1039/d3cp05844a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2024]
Abstract
The use of metamaterials in the design of optics is an important strategy for controlling light fields. Numerous terahertz metamaterial devices have been recently designed; however, their performance is relatively limited. Here, the thermally induced phase change characteristics of vanadium dioxide (VO2) were harnessed to design a perfect wide-angle and ultra-wideband switchable terahertz absorber/reflector with a simple structure and three layers from top to bottom (VO2, SiO2, and Au). The absorption mechanism based on the impedance matching theory and electric field distribution was investigated, and the influence of structural parameters on the absorption rate and performance of the absorber in a wide wave vector range were analyzed. The study findings showed that the device perfectly absorbed a bandwidth of over 6.0 THz (absorption >90%). The absorption (reflection) was modulated from 0.01 to 0.999 with the change of the background temperature. More importantly, the device could switch between complete ultra-wideband reflection and perfect absorption over a wide angle range. This study provides important insights into the design of terahertz functional devices.
Collapse
Affiliation(s)
- Yanyu Zhang
- School of Mathematics and Physics, Southwest University of Science and Technology, Mianyang 621010, China.
| | - Bin Hou
- School of Mathematics and Physics, Southwest University of Science and Technology, Mianyang 621010, China.
| | - Yongjia Yang
- School of Mathematics and Physics, Southwest University of Science and Technology, Mianyang 621010, China.
| | - Qianju Song
- School of Mathematics and Physics, Southwest University of Science and Technology, Mianyang 621010, China.
| | - Zao Yi
- School of Mathematics and Physics, Southwest University of Science and Technology, Mianyang 621010, China.
| | - Zigang Zhou
- School of Mathematics and Physics, Southwest University of Science and Technology, Mianyang 621010, China.
| |
Collapse
|
|
2
|
Song Q, Cheng X, Liu T, Zhang Y, Zhou Z, Yang Y, Chen H, Tang B, Chen J, Yi Z. Terahertz absorber based on vanadium dioxide with high sensitivity and switching capability between ultra-wideband and ultra-narrowband. Phys Chem Chem Phys 2023; 25:29061-29069. [PMID: 37861653 DOI: 10.1039/d3cp03709f] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2023]
Abstract
The terahertz perfect absorber can be applied in the control, sensing and modulation of optical fields in micro- and nanostructures. However, they are only single function, complex device structure and low sensing sensitivity. Based on this, by introducing the bound state in the continuum (BIC) with infinite quality factor and field enhancement effect, and taking advantage of the phase transition characteristics of vanadium dioxide (VO2), we designed a terahertz perfect absorber device which can actively switch between ultra-wideband and ultra-narrowband. The absorption mechanism is explained by multipole analysis theory, impedance matching theory and electromagnetic field distribution. The broadband absorption is mainly due to the electric dipole resonance on metallic VO2 materials, and the absorption is more than 99% across 3.64-6.96 THz, and it has excellent characteristics such as robustness. Ultra-narrowband perfect absorption has a quality factor greater than 2200 due mainly to the implementation of symmetrically protected BIC with a sensing sensitivity of 2.575 THz per RIU. Therefore, this research could be widely used in the fields of integrated optical circuits, optoelectronic sensing and perceptual modulation of energy, as well as providing additional design ideas for the design of terahertz multifunctional devices.
Collapse
Affiliation(s)
- Qianli Song
- School of Mathematics and Science, School of Materials and Chemistry, The State Key Laboratory of Environment-friendly Energy Materials, Tianfu Institute of Research and Innovation, Southwest University of Science and Technology, Mianyang 621010, China.
| | - Xingxin Cheng
- School of Mathematics and Science, School of Materials and Chemistry, The State Key Laboratory of Environment-friendly Energy Materials, Tianfu Institute of Research and Innovation, Southwest University of Science and Technology, Mianyang 621010, China.
| | - Tao Liu
- School of Mathematics and Science, School of Materials and Chemistry, The State Key Laboratory of Environment-friendly Energy Materials, Tianfu Institute of Research and Innovation, Southwest University of Science and Technology, Mianyang 621010, China.
| | - Yanyu Zhang
- School of Mathematics and Science, School of Materials and Chemistry, The State Key Laboratory of Environment-friendly Energy Materials, Tianfu Institute of Research and Innovation, Southwest University of Science and Technology, Mianyang 621010, China.
| | - Zigang Zhou
- School of Mathematics and Science, School of Materials and Chemistry, The State Key Laboratory of Environment-friendly Energy Materials, Tianfu Institute of Research and Innovation, Southwest University of Science and Technology, Mianyang 621010, China.
| | - Yongjia Yang
- School of Mathematics and Science, School of Materials and Chemistry, The State Key Laboratory of Environment-friendly Energy Materials, Tianfu Institute of Research and Innovation, Southwest University of Science and Technology, Mianyang 621010, China.
| | - Hao Chen
- School of Mathematics and Science, School of Materials and Chemistry, The State Key Laboratory of Environment-friendly Energy Materials, Tianfu Institute of Research and Innovation, Southwest University of Science and Technology, Mianyang 621010, China.
| | - Bin Tang
- School of Microelectronics and Control Engineering, Changzhou University, Changzhou 213163, China
| | - Jing Chen
- College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
| | - Zao Yi
- School of Mathematics and Science, School of Materials and Chemistry, The State Key Laboratory of Environment-friendly Energy Materials, Tianfu Institute of Research and Innovation, Southwest University of Science and Technology, Mianyang 621010, China.
- School of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China
| |
Collapse
|