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Frontiers of Optoelectronics

Front Optoelec    2012, Vol. 5 Issue (3) : 248-255     DOI: 10.1007/s12200-012-0267-9
REVIEW ARTICLE |
Polarization properties in helical metamaterials
Zhenyu YANG1(), Peng ZHANG1, Peiyuan XIE2, Lin WU1, Zeqin LU1, Ming ZHAO1
1. Wuhan National Laboratory for Optoelectronics, College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; 2. Hunan Electric Power Company Dispatches & Communication Center, Changsha 410007, China
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Abstract

In the last few years, there has been growing interest in the research of helical metamaterials due to the advantages of giant circular dichroism, broad operation bands, and compact structures. However, most of the researches were in the cases of single-, circular-helical metamaterials, and normal incidences. In this paper, we reviewed recent simulation works in the helical metamaterials with the finite-difference time-domain (FDTD) method, which mainly included the optical performances of double-, three-, four-helical metamaterials, performances of elliptical-helical metamaterials, and the polarization properties under the condition of oblique incidences. The results demonstrate that the double-helical metamaterials have operation bands more than 50%, which is broader than those of the single-helical structures. But both of them have low signal-to-noise ratios about 10 dB. The three- and four-helical metamaterials have significant improvement in overall performance. For elliptical-helixes, simulation results suggest that the transmitted light can have elliptical polarization states. On the condition of oblique incidences, the novel property of tunable polarization states occurred in the helical metamaterials, which could have much broader potential applications such as tunable optical polarizers, tunable beam splitters, and tunable optical attenuators.

Keywords finite-difference time-domain (FDTD) method      polarization      chiral media      helical metamaterials     
Corresponding Authors: YANG Zhenyu,Email:zyang@mail.hust.edu.cn   
Issue Date: 05 September 2012
 Cite this article:   
Zeqin LU,Ming ZHAO,Zhenyu YANG, et al. Polarization properties in helical metamaterials[J]. Front Optoelec, 2012, 5(3): 248-255.
 URL:  
http://journal.hep.com.cn/foe/EN/10.1007/s12200-012-0267-9
http://journal.hep.com.cn/foe/EN/Y2012/V5/I3/248
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Zeqin LU
Ming ZHAO
Zhenyu YANG
Peng ZHANG
Peiyuan XIE
Lin WU
Fig.1  Schematic diagrams of single-helical metamaterials
Fig.2  Schematic diagrams of double-helical metamaterials
Fig.3  Comparison of optical performances between single- and double-helical metamaterials. (a) and (b) Au single- and double-helix; (c) and (d) Al single- and double-helix
operation regions/μmaverage transmittances of RCP light/%average extinction ratios
Ausingle-helix0.72-1.006336∶1
double-helix0.75-1.306525∶1
Alsingle-helix0.42-0.796339∶1
double-helix0.44-1.105631∶1
Tab.1  Comparison of optical performances between single- and double-helical metamaterials
Fig.4  Schematic diagrams of (a) three- and (b) four-helical metamaterials
Fig.5  Optical performances of LCP incident light, and transmitted lights through single-, double-, three-, and four-helix
Fig.6  (a) Optical performance of elliptically single-helical metamaterials; (b) polarization state of transmitted LEP light represented on Poincaré sphere
WL/μmcoordinatesARconversion of LEP
1.07(-0.58, 0.36,-0.72)1.954.1%
0.93(-0.63, 0.31,-0.70)2.123.6%
0.83(-0.62, 0.33,-0.70)2.094.4%
0.75(-0.58, 0.31,-0.74)1.953.6%
WL: Wavelength, AR: axial ratio
Tab.2  Polarization states of transmitted LEP light
angle of incidence/(°)axial ratiotransmittances of LCP light/%extinction ratiodiagrams
201∶0.93575.04∶1Fig.7(a), “” in Fig. 7(f)
101∶0.80656.78∶1Fig.7(b), “” in Fig. 7(f)
01∶0.67697.58∶1Fig. 7(c), “” in Fig. 7(f)
-101∶0.66687.71∶1Fig. 7(d), “” in Fig. 7(f)
-201∶0.59626.22∶1Fig. 7(e), “” in Fig. 7(f)
DW= 30 m, NH= 3, SG= 200 nm, LH= 200 nm, DH= 100 nm.
Tab.3  Parameters and simulation results with different incident angles
Fig.7  Optical performances of the helical metamaterials with different incident angles. (a)-(e) are for the incident angles of 20°, 10°, 0°, -10°, and -20°, respectively; (f) is comparison of the transmitted light’s polarization states (represented on the Poincaré sphere). The blue, green, red, cyan, and pink points refer to the incident angles of 20°, 10°, 0°, -10°, and -20°, respectively
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