نتایج جستجو برای: Terahertz Absorber

تعداد نتایج: 19610  

Journal: :Optics express 2012
Mingbo Pu Min Wang Chenggang Hu Cheng Huang Zeyu Zhao Yanqin Wang Xiangang Luo

Highly efficient absorber is of particular importance in terahertz regime as naturally occurring materials with frequency-selective absorption in this frequency band is difficult to find. Here we present the design and characterization of a broadband terahertz absorber based on heavily Boron-doped silicon (0.7676 Ω cm) grating. It is numerically demonstrated by utilizing both the zero- and firs...

2010
Hu Tao C M Bingham D Pilon Kebin Fan A C Strikwerda D Shrekenhamer W J Padilla Xin Zhang R D Averitt

We present the design, fabrication and characterization of a dual band metamaterial absorber which experimentally shows two distinct absorption peaks of 0.85 at 1.4 THz and 0.94 at 3.0 THz. The dual band absorber consists of a dual band electric-field-coupled (ELC) resonator and a metallic ground plane, separated by an 8μm dielectric spacer. Fine tuning of the two absorption resonances is achie...

2016
Cheng Gong Mingzhou Zhan Jing Yang Zhigang Wang Haitao Liu Yuejin Zhao Weiwei Liu

We suggest and demonstrate the concept and design of sectional asymmetric structures which can manipulate the metamaterial absorber's working bandwidth with maintaining the other inherent advantages. As an example, a broadband terahertz perfect absorber is designed to confirm its effectiveness. The absorber's each cell integrates four sectional asymmetric rings, and the entire structure compose...

2009
N. I. Landy C. M. Bingham T. Tyler N. Jokerst D. R. Smith W. J. Padilla

We present the theory, design, and realization of a polarization-insensitive metamaterial absorber for terahertz frequencies. Effective-medium theory is used to describe the absorptive properties of the metamaterial in terms of optical constants—a description that has been thus far lacking. From our theoretical approach, we construct a device that yields over 95% absorption in simulation. Our f...

Journal: :Optics letters 2012
Li Huang Dibakar Roy Chowdhury Suchitra Ramani Matthew T Reiten Sheng-Nian Luo Antoinette J Taylor Hou-Tong Chen

We present the design, numerical simulations and experimental measurements of terahertz metamaterial absorbers with a broad and flat absorption top over a wide incidence angle range for either transverse electric or transverse magnetic polarization depending on the incident direction. The metamaterial absorber unit cell consists of two sets of structures resonating at different but close freque...

Journal: :Optics letters 2016
Ivonne Escorcia James Grant John Gough David R S Cumming

We demonstrate a low-cost uncooled terahertz (THz) imager fabricated in a standard 180 nm CMOS process. The imager is composed of a broadband THz metamaterial absorber coupled with a diode microbolometer sensor where the pn junction is used as a temperature sensitive device. The metamaterial absorber array is integrated in the top metallic layers of a six metal layer process allowing for comple...

Journal: :Optics letters 2011
Yong Ma Qin Chen James Grant Shimul C Saha A Khalid David R S Cumming

Metamaterial absorbers have attracted considerable attention for applications in the terahertz range. In this Letter, we report the design, fabrication, and characterization of a terahertz dual band metamaterial absorber that shows two distinct absorption peaks with high absorption. By manipulating the periodic patterned structures as well as the dielectric layer thickness of the metal-dielectr...

Journal: :Optics express 2008
Hu Tao Nathan I Landy Christopher M Bingham Xin Zhang Richard D Averitt Willie J Padilla

We present a metamaterial that acts as a strongly resonant absorber at terahertz frequencies. Our design consists of a bilayer unit cell which allows for maximization of the absorption through independent tuning of the electrical permittivity and magnetic permeability. An experimental absorptivity of 70% at 1.3 terahertz is demonstrated. We utilize only a single unit cell in the propagation dir...

J. Rashed-Mohassel M. Mehranpoura S. Jarchi,

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 design...

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