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Frontiers of Optoelectronics

Front Optoelec    2014, Vol. 7 Issue (1) : 53-58     DOI: 10.1007/s12200-013-0380-4
RESEARCH ARTICLE |
Misalignments among stacked layers of metamaterial terahertz absorbers
Yinghui GUO1(), Lianshan YAN1(), Wei PAN1, Bin LUO1, Xiantao ZHANG1, Xiangang LUO2
1. Center for Information Photonics & Communications, School of Information Science & Technology, Southwest Jiaotong University, Chengdu 610031, China; 2. State Key Lab of Optical Technology for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610029, China
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Abstract

Misalignment among stacked layers of absorbers is inevitable in practice. Adverse effects induced by this undesired factor was investigated and analyzed in this paper. The absorption responses of thin terahertz metamaterial (MM) absorber with different degree of misalignment were simulated by finite-difference time-domain (FDTD) method under both transverse magnetic (TM) andβtransverse electric (TE) polarization. Results show that slight misalignment deteriorates absorption response due to the decreased spatial resolution. The analyses are given in terms of the magnetic field distribution in the cross section. In addition, the depravation is changed with polarization, which depends on the direction of excursion.

Keywords metamaterials (MMs)      terahertz absorber      misalignment      subwavelength structure     
Corresponding Authors: GUO Yinghui,Email:lsyan@home.swjtu.edu.com; YAN Lianshan,Email:guoyinghui8@163.com   
Issue Date: 05 March 2014
 Cite this article:   
Yinghui GUO,Lianshan YAN,Wei PAN, et al. Misalignments among stacked layers of metamaterial terahertz absorbers[J]. Front Optoelec, 2014, 7(1): 53-58.
 URL:  
http://journal.hep.com.cn/foe/EN/10.1007/s12200-013-0380-4
http://journal.hep.com.cn/foe/EN/Y2014/V7/I1/53
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Yinghui GUO
Lianshan YAN
Wei PAN
Bin LUO
Xiantao ZHANG
Xiangang LUO
Fig.1  Schematic unit cell of terahertz absorbers. (a) Three-dimensional oblique view; and (b) two-dimensional side view
Fig.2  (a) Reflection spectra for different polymer thickness ; (b) resonance wavelengths evolution with the radius of ring
Fig.3  Schematic unit cell of broadband terahertz absorbers. (a) Three-dimensional oblique view; (b) top view with defined parameters; and (c) corresponding absorption spectra
parametersPr1r2r3h1h2h3wt
value/μm226.7784.50.20.310.2
Tab.1  Geometric parameters of the broadband terahertz absorber
Fig.4  Magnetic field profile at = 0 planes for three absorption peaks of absorber. (a) III; (b) II; and (c) I. Dotted line: main area of field distributions
Fig.5  Top view of the structure with a lateral shift in the direction (a); absorption responses with from 0 to 1 μm under transverse magnetic (TM) (b) andβtransverse electric (TE) polarization (c)
Fig.6  Magnetic field profile || at = 0 plane with TM polarization incidence for peaks (a) III; (b) II and (c) I when = 1.0 μm. Dotted line: main area of field distributions
Fig.7  Charge density distribution at three metallic rings for TM polarization. (a)-(c) Three metallic rings without misalignment; (d)-(f) three metallic rings with = 1.0 μm. (a) and (d) III; (b) and (e) II; (c) and (f) I
Fig.8  Electric field profile of three rings at peak III at plane for TE polarization with = 1.0 μm. (a) Ring III; (b) ring II; and (c) ring I
Fig.9  Absorption spectra for TE polarization with different period when = 1.0 μm
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