Multiband stereometamaterial-based polarization spectral filter

J. H. Shi, H. F. Ma, W. X. Jiang, and T. J. Cui

Phys. Rev. B 86, 035103 – Published 5 July 2012

Abstract

We propose a kind of stereometamaterial composed of periodic structures with twisted asymmetrical split-ring (ASR) resonators. The proposed stereometamaterial has intrinsic chirality and can be used as a multiband polarization spectral filter. Full-wave simulation and experimental results demonstrate that the stereometamaterial with the twist angle of $φ = 90^{\circ}$ exhibits three ripple-free cross-polarization transmission peaks at normal incidence of plane waves. The cross-polarization transmission bands are centered at the maxima of circular dichroism, accompanied by pairs of pure circular birefringence points. In physics, the near-field electric and magnetic coupling of orthogonal ASR molecules in parallel planes contributes to the conversion of two orthogonal linear polarizations. The transmission of the proposed multiband polarization spectral filter can be engineered via the mutual twist angle and asymmetry of the ASRs and the thickness of the dielectric spacer layer and also be tuned via the angle of incidence.

Received 7 May 2012

DOI:https://doi.org/10.1103/PhysRevB.86.035103

Authors & Affiliations

J. H. Shi^1,2,*, H. F. Ma², W. X. Jiang², and T. J. Cui^2,†

¹College of Science, Harbin Engineering University, Harbin 150001, China
²State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China

^*Corresponding author: hrbeusjh@gmail.com
^†tjcui@seu.edu.cn

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Issue

Vol. 86, Iss. 3 — 15 July 2012

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Images

Figure 1
Stereometamaterial spectral filters. (a) The stereometamaterial sandwiched between two orthogonal linear polarizers $P_{1}$ and $P_{2}$ acts as a cross-polarization spectral filter at normal incidence. The incident wave propagates along the − $z$ direction. The bold arrows denote the polarization directions. (b) The single-layer metamaterial only exhibits strong resonant optical activity at oblique incidence that is realized by tilting the metamaterial around its symmetry axis, which coincides with a zero-birefringence isoindex point. (c) The schematic of a unit cell of the stereo ASR dimer array. The two ASRs are rotated with respect to each other by the twist angle $φ$ . Each ASR resonator has two different metallic arcs corresponding to angles α and β. Their central points always lie on the $z$ axis, and one ASR has its symmetry axis along the $y$ direction in all experiments. (d) The top view of a fabricated stereometamaterial sample, which is manufactured from FR4 PCB laminates using the photolithography technique.Reuse & Permissions
Figure 2
The transmission spectra of stereometamaterial-based polarization spectral filters. (a) Measured and (b) simulated transmission spectra of the stereometamaterial with twist angle $φ = 90^{\circ}$ . For clarity, the amplitude of the measured cross-polarization transmission is multiplied by a factor of 5. The inset shows a stereo ASR dimer. (c) Measured and (d) simulated cross-polarization transmission spectra of the stereometamaterials with twist angles $φ = 0^{\circ},$ $φ = 45^{\circ},$ $φ = 90^{\circ},$ and $φ = 180^{\circ}$ for the $y$ -polarized incident EM waves.Reuse & Permissions
Figure 3
Angular dependence of the stereometamaterial cross-polarization transmission when the twist angle is fixed as $φ = 90^{\circ}$ .Reuse & Permissions
Figure 4
Engineering stereometamaterial-based polarization spectral filters. Simulated transmission spectra as a function of (a) twist angle, (b) dielectric-layer thickness, and (c) asymmetry. (d) The transmission of an ultranarrow filter with no loss for α $=$ 160° and β $=$ 164°.Reuse & Permissions
Figure 5
The amplitude and phase differences for circular polarizations transmitted through the stereometamaterial with the twist angle $φ = 90^{\circ}$ . The solid, dotted, and dash-dotted circle pairs indicate the locations of pure circular birefringence points. Solid dots indicate the positions of crossed polarizer transmission peaks. The inset in the dashed rectangle shows simulated crossed polarizer transmission of the stereometamaterial. I, II, and III denote the three passbands of the stereometamaterial.Reuse & Permissions
Figure 6
Resonant modes for the cross-polarization transmission peaks of the stereometamaterial with the twist angle $φ = 90^{\circ} .$ (a) The surface current distribution. The modes correspond to resonance peaks of the crossed transmission marked in Fig. 2b. Bold arrows qualitatively indicate the direction of excited magnetic dipole $m_{1}$ and $m_{2}$ . Solid and dashed thin arrows indicate the directions of surface currents along ASRs in different layers. (b) The absolute electric-field distribution of cross-polarization transmission peak in the $x y$ plane between two ASRs (middle) at 10.50 GHz. (c) The local electric and magnetic fields as detected by probes lying at the center of a dark element of ASR along the $z$ axis.Reuse & Permissions

Physical Review B

covering condensed matter and materials physics