{"title":"基于石墨烯和二氧化钒的用于宽带吸收和波前操纵的多功能太赫兹元表面","authors":"","doi":"10.1016/j.diamond.2024.111431","DOIUrl":null,"url":null,"abstract":"<div><p>A multifunctional terahertz (THz) metasurface for broadband absorption and wavefront manipulation based on graphene and vanadium dioxide (VO<sub>2</sub>) is proposed in this paper. While VO<sub>2</sub> is in the metallic state, a broadband absorber is obtained. The bandwidth of over 90 % absorption rate is 1.11 THz. By adjusting graphene Fermi level, absorption bandwidth dynamical tunning is realized. The modulation depth for bandwidth tuning is 64 %, and the drift of center frequency is slight. Also, an equivalent circuit model is explored to explain the absorption mechanism. While VO<sub>2</sub> is in the insulating state, the metasurface acts as a deflected vortex beam generator. Based on the convolutional operations, the functionalities of deflector and spiral phase plate are integrated into the proposed metasurface. Through precise phase arrangement based on the rotation angle of the metal resonator, arbitrary manipulation of transmitted vortex beams can be performed in the range of 0.75–0.85 THz. We also develop a 1D focusing metalen operating at different frequencies, which exhibits remarkable subwavelength focusing capabilities. Thus, multifuncitons including broadband absorption, beam deflection, vortex beam generation, and focusing metalen are integrated into one single metasurface successfully. It holds the great potential in diverse applications, such as optical stealth, beam generation, and holographic technique in the future.</p></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":null,"pages":null},"PeriodicalIF":4.3000,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Multifunctional terahertz metasurface for broadband absorption and wavefront manipulation based on graphene and vanadium dioxide\",\"authors\":\"\",\"doi\":\"10.1016/j.diamond.2024.111431\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>A multifunctional terahertz (THz) metasurface for broadband absorption and wavefront manipulation based on graphene and vanadium dioxide (VO<sub>2</sub>) is proposed in this paper. While VO<sub>2</sub> is in the metallic state, a broadband absorber is obtained. The bandwidth of over 90 % absorption rate is 1.11 THz. By adjusting graphene Fermi level, absorption bandwidth dynamical tunning is realized. The modulation depth for bandwidth tuning is 64 %, and the drift of center frequency is slight. Also, an equivalent circuit model is explored to explain the absorption mechanism. While VO<sub>2</sub> is in the insulating state, the metasurface acts as a deflected vortex beam generator. Based on the convolutional operations, the functionalities of deflector and spiral phase plate are integrated into the proposed metasurface. Through precise phase arrangement based on the rotation angle of the metal resonator, arbitrary manipulation of transmitted vortex beams can be performed in the range of 0.75–0.85 THz. We also develop a 1D focusing metalen operating at different frequencies, which exhibits remarkable subwavelength focusing capabilities. Thus, multifuncitons including broadband absorption, beam deflection, vortex beam generation, and focusing metalen are integrated into one single metasurface successfully. It holds the great potential in diverse applications, such as optical stealth, beam generation, and holographic technique in the future.</p></div>\",\"PeriodicalId\":11266,\"journal\":{\"name\":\"Diamond and Related Materials\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.3000,\"publicationDate\":\"2024-07-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Diamond and Related Materials\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0925963524006447\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, COATINGS & FILMS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Diamond and Related Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0925963524006447","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, COATINGS & FILMS","Score":null,"Total":0}
Multifunctional terahertz metasurface for broadband absorption and wavefront manipulation based on graphene and vanadium dioxide
A multifunctional terahertz (THz) metasurface for broadband absorption and wavefront manipulation based on graphene and vanadium dioxide (VO2) is proposed in this paper. While VO2 is in the metallic state, a broadband absorber is obtained. The bandwidth of over 90 % absorption rate is 1.11 THz. By adjusting graphene Fermi level, absorption bandwidth dynamical tunning is realized. The modulation depth for bandwidth tuning is 64 %, and the drift of center frequency is slight. Also, an equivalent circuit model is explored to explain the absorption mechanism. While VO2 is in the insulating state, the metasurface acts as a deflected vortex beam generator. Based on the convolutional operations, the functionalities of deflector and spiral phase plate are integrated into the proposed metasurface. Through precise phase arrangement based on the rotation angle of the metal resonator, arbitrary manipulation of transmitted vortex beams can be performed in the range of 0.75–0.85 THz. We also develop a 1D focusing metalen operating at different frequencies, which exhibits remarkable subwavelength focusing capabilities. Thus, multifuncitons including broadband absorption, beam deflection, vortex beam generation, and focusing metalen are integrated into one single metasurface successfully. It holds the great potential in diverse applications, such as optical stealth, beam generation, and holographic technique in the future.
期刊介绍:
DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices.
The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.