IJE TRANSACTIONS A: Basics Vol. 32, No. 4 (April 2019) 503-509    Article in Press

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S. Jarchi, J. Rashed-Mohassel and M. Mehranpour
( Received: May 23, 2018 – Accepted in Revised Form: March 07, 2019 )

Abstract    In this paper, a compact plasmonic metamaterial absorber for terahertz frequencies is proposed and simulated. The absorber is based on metamaterial graphene structures, and benefits from dynamically controllable properties of graphene. Through patterning graphene layers, plasmonic resonances are tailored to provide a dual band as well as an improved bandwidth absorption. Unit cell of the designed structure is made of four complementary square rings, on a thin grounded SiO2 layer of 5 µm thickness. Four splits are included in the square rings to provide continuity of graphene layer. Dual band absorption of 90% is provided, which frequency of peak absorption increases with increasing chemical potential of graphene layer. It is shown that with varying dimensions of the split rings an improved bandwidth absorber is also achieved, where absorption band increases with increasing graphene's chemical potential either. To better understand excitation of plasmonic resonances on the proposed structure, electric field distribution on the graphene layer as well as at the unit cell’s cross section is investigated and graphically demonstrated. Dependence of absorption on incidence and polarization angles of the incoming wave is studied and also graphically presented.


Keywords    Graphene; Metamaterial; Terahertz Absorber; Tunable Absorber; Dual-band Absorber



در این مقاله یک جاذب فراماده پلاسمونی فشرده برای فرکانسهای تراهرتز پیشنهاد شده و شبیه سازی شده است. جاذب براساس ساختارهای گرافنی فراماده می باشد و از ويژگی قابلیت کنترل پویای گرافن بهره می برد. با استفاده از شکل دهی لایه گرافن، تشدیدهای پلاسمونی طوری طراحی شده اند که جذب دو باند، و همین طور جذب با پهنای باند بهبوديافته بدست آید. سلول واحد ساختار طراحی شده از چهار حلقه مربعی مکمل تشکیل شده است که روی یک لایه SiO2 زمین شده با ضخامت 5 میکرومتر قرار دارند. در حلقه های مربعی چهار شکاف قرار داده شده است تا پیوستگی لایه گرافن حفظ شود. جذب دو باند بالای 90% بدست آمده است، به طوری که فرکانس بیشینه جذب با افزایش پتانسیل شیمیایی گرافن زیاد می شود. نشان داده شده است که با تغییر ابعاد حلقه های شکاف دار، جاذب با پهنای باند بهبود یافته محقق می شود که در آن نیز باند جذب با افزایش پتانسیل شیمیایی گرافن افزایش می یابد. به منظور درک بهتر برانگیختگی تشدیدهای پلاسمونی در ساختار پیشنهاد شده، گستردگی میدان الکتریکی روی لایه گرافن، و همین طور در سطح برش سلول واحد بررسی شده و با استفاده از شکل نشان داده شده است. وابستگی جذب به زوایای تابش و قطبش موج برخوردی مطالعه و ارایه شده است.


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