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تعداد صفحات این فایل: ۱۴ صفحه

 ما به طور تحلیلی به بررسی روش مدار برای ترکیب گرافن و فرامواد در طراحی جاذب  پرداختیم. از آن جا که ورقه گرافن و فیلم فرا مواد دارای ضخامت اپتیکی فوق  نازک می باشد، خواص الکتریکی ان ها از طریق رسانایی سطحی تعیین می شود. نتایج شبیه سازی شده، حاکی از روایی و اعتبار مدل خط  انتقال برای طراحی جاذبGM می باشند. یک ساختار فرا مواد بهینه، ایجاد جاذب GM قابل تنظیم فرکانس بسته به پتانسیل شیمیایی است. این مطالعه نشان دهنده یک روش عمل برای طراحی ابزار های ترکیبی GM می باشد که را را برای ابتکارات جدید در  اپتیک های قابل تغییر هموار کرده است.

عنوان انگلیسی:A circuit method to integrate metamaterial and graphene in absorber design~~en~~

Introduction A perfect electromagnetic (EM) wave absorber is a device to absorb all incident radiation at the operating frequency and to disable all other light propagation channels [1]. Salisbury screen based on the transmission line theory is the fundamental strategy to design EM absorbers in which a resistive sheet is placed in front of a metal ground plane with a distance of one fourth of the wavelength [2]. As a broadband extension of the Salisbury screen, the Jaumann absorber consists of two or more resistive sheets and resonances over multiple wavelengths [2]. To achieve high absorption over broad band, circuit analog (CA) absorbers are developed in which lossy frequency selective surfaces (FSS) are arranged periodically in front of a single metal ground [3,4]. With its rapid developments in artificial materials, metamaterials are recently proposed to design novel EM absorbers [5– ۱۰]. Unlike conventional absorbers based on transmission line theory, metamaterials, consisting of solely metallic elements, are usually described as effective materials via effective electric permittivity and effective magnetic permeability [11–۱۵]. By independently tuning the resonance in and , metamaterials can be designed with matched impedance to free space, thus realizing approximately zero reflectivity [5]. This seminal work soon has inspired other works in various frequency regimes. High absorptivity has been achieved in THz [16], mid-infrared [17], near-infrared [18] and visible [19] frequencies. Graphene [20–۲۲], one-atom-thick electromagnetic material with the flexible tunability of its chemical potential [23], is a promising two-dimensional platform of designing atomicallythick plasmonics and metamaterials [24–۲۶]. In particular, some works have already shown the good optical absorption performance of graphene sheets [27–۳۰]. However, combining graphene with conventional metamaterials to establish novel EM absorbers has been rarely discussed [27–۳۰]. In this paper, basing on transmission line theory, we propose a circuit analog method to integrate graphene and metamaterial sheets in absorber design, which may provide theoretical guidance for designing graphenemetamaterial (GM) combined absorbers. As a proof of concept, an optimized tunable GM absorber, whose operating frequency can be varied from 1.77 THz to 2.59 THz, is proposed. 2. Results and discussion The GM absorber under consideration consists of a metamaterial sheet and a graphene sheet separated by insulators (polymer) located upon a metal ground plane. Two typical structures are schematically shown in Fig. 1. The unit cells of both the grapheneembedded (in Fig. 1(a)) and metamaterial-embedded (in Fig. 1(b)) structures are periodically arranged along the x and y directions with the periodicity, p ¼ ۲۰ m. The patterned metamaterial film (cut-wire shape) is constructed by copper whose thickness is tm ¼ ۰:۰۲ m. In the graphene-embedded sample, a graphene sheet is sandwiched between two polymer layers (with different thicknesses d1,d2) and the metamaterial film is placed on the top. Whereas, the metamaterial-embedded sample has a reverse arrangement in which the top layer is a graphene sheet. It should be noted that throughout this paper the time variation is ejt , where j is the imaginary unit. Based on transmission line theory, an effective circuit analog model is established in Fig. 1(c), where 0 is the dielectric constant of vacuum, p ¼ ۳:۵۰ represents the dielectric constant of polymer. Due to the ultrathin thicknesses compared with the operating wavelength, both the graphene sheet and the metamaterial film can be treated as conductive films with the surface impedances Zg and Zm, respectively. Polymer layers, modeled as transmission lines, can be designed either inductive or capacitive to satisfy desired absorption performance.

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