Misalignments among stacked layers of metamaterial terahertz absorbers

doi:10.1007/s12200-013-0380-4

Front Optoelec

2014, Vol. 7

Issue (1) : 53-58 https://doi.org/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 Author(s): 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:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-013-0380-4
https://academic.hep.com.cn/foe/EN/Y2014/V7/I1/53

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

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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