کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7927667 | 1512541 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Frequency-tunable terahertz absorbers based on graphene metasurface
ترجمه فارسی عنوان
تداخل تراکم تراورس بر اساس گرافن متاسفیم
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
چکیده انگلیسی
We present efficient designs of graphene-based thin absorbers, which are capable of near-unity absorption of the incident electromagnetic waves in the terahertz regime. Primarily, a single-frequency absorber is proposed. Subsequently, by simply stacking the double layer graphene metasurface with various geometric dimensions, the dual-frequency absorption and broadband absorption are realized respectively. Results demonstrate that the absorptivity of the single-frequency absorber reaches 99.51% at 2.71Â THz when the Fermi energy is fixed at 0.9Â eV. The dual-frequency absorber can simultaneously work at two frequencies with its absorptivity being 98.94% for 1.99Â THz and 99.1% for 2.69Â THz. The bandwidth of absorption rate above 90% expands three times when compared with the former single-frequency absorber. Additionally, it possesses the polarization-insensitive and large angle tolerance properties. More importantly, the absorption frequency can be dynamically controlled by adjusting Fermi energy levels without varying the nanostructure, which exhibits tremendous application values in many fields.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics Communications - Volume 382, 1 January 2017, Pages 144-150
Journal: Optics Communications - Volume 382, 1 January 2017, Pages 144-150
نویسندگان
Ming Chen, Wei Sun, Jianjin Cai, Linzi Chang, Xiaofei Xiao,