{"title":"用于太赫兹间隙机制的高效微型超薄可调 UWB 石墨烯元表面吸收器","authors":"","doi":"10.1016/j.cap.2024.09.004","DOIUrl":null,"url":null,"abstract":"<div><p>This work introduces an ultra-thin tunable ultra-wideband (UWB) metasurface absorber (MSA) for the terahertz (THz) gap. The polarization-insensitive MSA provides an absorptivity (<span><math><mi>A</mi><mo>(</mo><mi>f</mi><mo>)</mo></math></span>) ≥ 90% from 0.1 to 11.5 THz, corresponding to 196.6% fractional bandwidth. The usage of resonant slots engraved on top patterned graphene sheet (<span><math><msub><mrow><mi>G</mi></mrow><mrow><mi>p</mi><mi>a</mi><mi>t</mi></mrow></msub></math></span>) and strong plasmonic coupling in the Fabry-Perot cavity formed between top <span><math><msub><mrow><mi>G</mi></mrow><mrow><mi>p</mi><mi>a</mi><mi>t</mi></mrow></msub></math></span> and bottom continuous graphene (<span><math><msub><mrow><mi>G</mi></mrow><mrow><mi>c</mi><mi>o</mi><mi>n</mi><mi>t</mi></mrow></msub></math></span>) in bilayer stack configuration ensures absorptivity over a UWB THz spectrum. An equivalent circuit model (ECM) closely follows the <span><math><mi>A</mi><mo>(</mo><mi>f</mi><mo>)</mo></math></span> response of the proposed MSA. The proposed DC-biasing mechanism can regulate the chemical potential (<span><math><msub><mrow><mi>μ</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>) of the connected <span><math><msub><mrow><mi>G</mi></mrow><mrow><mi>c</mi><mi>o</mi><mi>n</mi><mi>t</mi></mrow></msub></math></span> efficiently. A DC bias voltage of 0 to 6.1 V is adequate to vary <span><math><msub><mrow><mi>μ</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> of <span><math><msub><mrow><mi>G</mi></mrow><mrow><mi>c</mi><mi>o</mi><mi>n</mi><mi>t</mi></mrow></msub></math></span> from 0 to 0.6 eV for achieving tunable <span><math><mi>A</mi><mo>(</mo><mi>f</mi><mo>)</mo></math></span>. The structure maintains its ultra-thin nature and has a thickness of only <span><math><msub><mrow><mi>λ</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span>/1500, where <span><math><msub><mrow><mi>λ</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> is the free space wavelength calculated at 0.1 THz. In addition, the periodicity is only <span><math><msub><mrow><mi>λ</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span>/300. The MSA also provides stable absorption response from 0.1 to 11.5 THz with <span><math><mi>A</mi><mo>(</mo><mi>f</mi><mo>)</mo></math></span> ≥ 80% for incidence angle (<em>θ</em>) up to <span><math><msup><mrow><mn>60</mn></mrow><mrow><mo>∘</mo></mrow></msup></math></span> under both transverse magnetic (TM) and transverse electric (TE) polarization.</p></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":null,"pages":null},"PeriodicalIF":2.4000,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1567173924002049/pdfft?md5=bce85d53a3c7a03fa8bdaa3158ae344d&pid=1-s2.0-S1567173924002049-main.pdf","citationCount":"0","resultStr":"{\"title\":\"An efficient and miniaturized ultra-thin tunable UWB graphene metasurface absorber for terahertz gap regime\",\"authors\":\"\",\"doi\":\"10.1016/j.cap.2024.09.004\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>This work introduces an ultra-thin tunable ultra-wideband (UWB) metasurface absorber (MSA) for the terahertz (THz) gap. The polarization-insensitive MSA provides an absorptivity (<span><math><mi>A</mi><mo>(</mo><mi>f</mi><mo>)</mo></math></span>) ≥ 90% from 0.1 to 11.5 THz, corresponding to 196.6% fractional bandwidth. The usage of resonant slots engraved on top patterned graphene sheet (<span><math><msub><mrow><mi>G</mi></mrow><mrow><mi>p</mi><mi>a</mi><mi>t</mi></mrow></msub></math></span>) and strong plasmonic coupling in the Fabry-Perot cavity formed between top <span><math><msub><mrow><mi>G</mi></mrow><mrow><mi>p</mi><mi>a</mi><mi>t</mi></mrow></msub></math></span> and bottom continuous graphene (<span><math><msub><mrow><mi>G</mi></mrow><mrow><mi>c</mi><mi>o</mi><mi>n</mi><mi>t</mi></mrow></msub></math></span>) in bilayer stack configuration ensures absorptivity over a UWB THz spectrum. An equivalent circuit model (ECM) closely follows the <span><math><mi>A</mi><mo>(</mo><mi>f</mi><mo>)</mo></math></span> response of the proposed MSA. The proposed DC-biasing mechanism can regulate the chemical potential (<span><math><msub><mrow><mi>μ</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>) of the connected <span><math><msub><mrow><mi>G</mi></mrow><mrow><mi>c</mi><mi>o</mi><mi>n</mi><mi>t</mi></mrow></msub></math></span> efficiently. A DC bias voltage of 0 to 6.1 V is adequate to vary <span><math><msub><mrow><mi>μ</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> of <span><math><msub><mrow><mi>G</mi></mrow><mrow><mi>c</mi><mi>o</mi><mi>n</mi><mi>t</mi></mrow></msub></math></span> from 0 to 0.6 eV for achieving tunable <span><math><mi>A</mi><mo>(</mo><mi>f</mi><mo>)</mo></math></span>. The structure maintains its ultra-thin nature and has a thickness of only <span><math><msub><mrow><mi>λ</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span>/1500, where <span><math><msub><mrow><mi>λ</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> is the free space wavelength calculated at 0.1 THz. In addition, the periodicity is only <span><math><msub><mrow><mi>λ</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span>/300. The MSA also provides stable absorption response from 0.1 to 11.5 THz with <span><math><mi>A</mi><mo>(</mo><mi>f</mi><mo>)</mo></math></span> ≥ 80% for incidence angle (<em>θ</em>) up to <span><math><msup><mrow><mn>60</mn></mrow><mrow><mo>∘</mo></mrow></msup></math></span> under both transverse magnetic (TM) and transverse electric (TE) polarization.</p></div>\",\"PeriodicalId\":11037,\"journal\":{\"name\":\"Current Applied Physics\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.4000,\"publicationDate\":\"2024-09-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S1567173924002049/pdfft?md5=bce85d53a3c7a03fa8bdaa3158ae344d&pid=1-s2.0-S1567173924002049-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Current Applied Physics\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1567173924002049\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Current Applied Physics","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1567173924002049","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
An efficient and miniaturized ultra-thin tunable UWB graphene metasurface absorber for terahertz gap regime
This work introduces an ultra-thin tunable ultra-wideband (UWB) metasurface absorber (MSA) for the terahertz (THz) gap. The polarization-insensitive MSA provides an absorptivity () ≥ 90% from 0.1 to 11.5 THz, corresponding to 196.6% fractional bandwidth. The usage of resonant slots engraved on top patterned graphene sheet () and strong plasmonic coupling in the Fabry-Perot cavity formed between top and bottom continuous graphene () in bilayer stack configuration ensures absorptivity over a UWB THz spectrum. An equivalent circuit model (ECM) closely follows the response of the proposed MSA. The proposed DC-biasing mechanism can regulate the chemical potential () of the connected efficiently. A DC bias voltage of 0 to 6.1 V is adequate to vary of from 0 to 0.6 eV for achieving tunable . The structure maintains its ultra-thin nature and has a thickness of only /1500, where is the free space wavelength calculated at 0.1 THz. In addition, the periodicity is only /300. The MSA also provides stable absorption response from 0.1 to 11.5 THz with ≥ 80% for incidence angle (θ) up to under both transverse magnetic (TM) and transverse electric (TE) polarization.
期刊介绍:
Current Applied Physics (Curr. Appl. Phys.) is a monthly published international journal covering all the fields of applied science investigating the physics of the advanced materials for future applications.
Other areas covered: Experimental and theoretical aspects of advanced materials and devices dealing with synthesis or structural chemistry, physical and electronic properties, photonics, engineering applications, and uniquely pertinent measurement or analytical techniques.
Current Applied Physics, published since 2001, covers physics, chemistry and materials science, including bio-materials, with their engineering aspects. It is a truly interdisciplinary journal opening a forum for scientists of all related fields, a unique point of the journal discriminating it from other worldwide and/or Pacific Rim applied physics journals.
Regular research papers, letters and review articles with contents meeting the scope of the journal will be considered for publication after peer review.
The Journal is owned by the Korean Physical Society.