قطبشگرهای تراهرتز پهن باند قابل تنظیم با راندمان بالا مبتنی بر فراسطوح گرافنی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دکتری تخصصی ، دانشگاه شیراز ، شیراز، ایران

2 دانشیار، دانشگاه شیراز،شیراز، ایران

چکیده

در مقاله حاضر دو قطبشگر‌ تراهرتز پهن‌باند قابل تنظیم فوق‌العاده نازک با راندمان بالا مبتنی بر فراسطوح گرافنی که در حالت انتقال، قطبش خطی را به دایروی تبدیل می کنند ارائه شده است. هر ساختار شامل یک یا دو پشته از بستر دی الکتریک با لایه گرافنی شکافدار می باشد. هر دو قطبشگر پهنای باند قابل تنظیم وسیعی با ضریب انتقال بزرگ در محدوده فرکانس تراهرتز را ارائه می دهند. در مقایسه با قطبشگرهای قبلی، ساختار پیشنهادی با یک پشته، از نظر پهنای باند کسری 29 درصد و از نظر ضریب انتقال 49 درصد بیشتر است. قطبشگر دو پشته، از نظر پهنای باند کسری 77 درصد و از نظر ضریب انتقال 13 درصد در مقایسه با قطبشگرهای قبلی بیشتر و دارای نسبت محوری خیلی خوبی می باشد. قابلیت تنظیم پذیری با تغییر انرژی فرمی (پتانسیل شیمیایی) گرافن از 2/0 به 1 الکترون ولت، با اعمال ولتاژ بایاس DC به دست می آید. علاوه بر این، در ساختارهای قبلی از لایه گرافنی گسسته استفاده شده است، بنابراین برای کنترل ساختار با اعمال ولتاژ بایاس خارجی، لازم است تمامی پچ های گرافن را با سیم های فلزی نازک به هم وصل کنیم، این کار در عمل می تواند بسیار پیچیده و دشوار باشد. درحالیکه در ساختارهای ارائه شده در این مقاله، لایه گرافن پیوسته است و این مشکلات را نخواهیم داشت. افزون بر این، عمل تبدیل قطبش در تابش مایل، در طیف وسیعی از زوایای برخورد تا 60 درجه به خوبی حفظ می‌شود. ابعاد سلول واحد و ضخامت آن کمتر از λ⁄10 است، که بسیار کوچکتر از طول موج فضای آزاد، می باشد. همچنین جهت تسهیل در تحلیل و تفسیر نتایج، مدار معادل ساختار ارائه شده است. با ویژگی‌های یادشده، کار حاضر می تواند گام موثری در توسعه مبدل‌های قطبش قابل کنترل با کاربردهای بالقوه در تصویربرداری، سنجش و ارتباطات بردارد.

کلیدواژه‌ها

عنوان مقاله [English]

Highly efficient tunable broadband terahertz polarizers based on graphene metasurface

نویسندگان [English]

  • Isa Mazraeh-Fard 1
  • Abbas Alighanbari 2
1 PhD, Shiraz University, Shiraz, Iran
2 Associate Professor, Shiraz University, Shiraz, Iran
چکیده [English]

Ultrathin tunable broadband terahertz transmission mode linear-to-circular polarizers are proposed and numerically validated. Each structure consists one or two stack of a dielectric substrate with slotted graphene. Both polarizers yield tunable broadband conversion with large transmission coefficients in terahertz frequency range. Compared to the previous polarizers, the proposed structure with one stack exhibits a 29% larger fractional bandwidth and 49% larger transmittance. The polarizer with two stack features a 77% larger fractional bandwidth and 13% larger transmittance, compared to the previous polarizers, with excellent axial ratio. The tuning frequency range for the proposed one- and two-stack structures is (2.9 to 5.1) and (2.2 to 5.3) THz, respectively. The tuning is achieved by varying the graphene Fermi energy (chemical potential) from 0.2 to 1 eV, by the application of a DC bias voltage. In addition, in the previous structures, the graphene layer is discrete, so in order to control the structures by applying an external voltage, it is necessary to connect all the graphene patches with thin metal wires, which in practice can be very complicated and difficult. While in the presented structures, the graphene layer is continuous and we will not have these problems. Moreover, the polarization conversion performance is well maintained under oblique incidence condition, over a wide range of incident angles up to 60°. The size of the square-shaped unit cell and the thickness are less than λ_0⁄10, much smaller than the free-space wavelength of the incident waves, λ_0. With the above features, the present work offers a further step in developing controllable polarization converters with potential applications in imaging, sensing, and communications.

کلیدواژه‌ها [English]

  • Equivalent Circuit
  • Tunable Broadband Terahertz Polarizers
  • Graphene metasurfaces
  • Conversion of Linear to Circular Polarization

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مراجع

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رادار
دوره 10، شماره 2 - شماره پیاپی 28
شماره پیاپی 28، فصلنامه پاییز و زمستان
دی 1401

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سابقه مقاله

  • تاریخ دریافت: 24 مهر 1401
  • تاریخ بازنگری: 02 دی 1401
  • تاریخ پذیرش: 12 دی 1401
  • تاریخ انتشار: 01 بهمن 1401

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