Volume 14, Issue 1 (Winter-Spring 2020)
IJOP 2020, 14(1): 85-90 |
Back to browse issues page
1- Department of Nanotechnology Engineering, Tarbiat Modares University, Tehran, Iran
2- Department of Nanotechnology Engineering, Tarbiat Modares University, Tehran, Iran, Department of Electrical & Computer Engineering, Tarbiat Modares University, Tehran, Iran
3- Department of Electrical & Computer Engineering, Tarbiat Modares University, Tehran, Iran
2- Department of Nanotechnology Engineering, Tarbiat Modares University, Tehran, Iran, Department of Electrical & Computer Engineering, Tarbiat Modares University, Tehran, Iran
3- Department of Electrical & Computer Engineering, Tarbiat Modares University, Tehran, Iran
Abstract: (3149 Views)
Topological Insulators are systems where the broken time reversal symmetry gives rise to protected edge modes that support backscatter-free and one-way propagation of electromagnetic waves by opening non-trivial bandgaps. In this study we investigate a one-way topologically protected waveguide in the frequency range of f=6.0 to 8.0 GHz. The time reversal symmetry is broken by an applied magnetic field in the z direction. We show that the waveguide propagates the light in only one direction that can be controlled by the applied magnetic field and no backscattering is present in the waveguide which results in a near 100% transmission of light to the output. Furthermore, we investigate effect of the applied magnetic field on the topological properties of the system by considering the material dispersion of the rods. Our results show that 3 different frequency ranges will be supported by the edge modes at each given magnetic field. By increasing the magnitude of the applied magnetic field, a blue shift in the non-trivial bandgap is seen, where it can be used to tailor the modes for the waveguide.
Type of Study: Research |
Subject:
General
Received: 2020/06/14 | Revised: 2020/07/23 | Accepted: 2020/08/6 | Published: 2020/09/10
Received: 2020/06/14 | Revised: 2020/07/23 | Accepted: 2020/08/6 | Published: 2020/09/10
References
1. C.L. Kane and E.J. Mele, "Z2 topological order and quantum spin hall effect," Phys. Rev. Lett. Vol. 95, pp. 146802-146806, 2005. [DOI:10.1103/PhysRevLett.95.146802]
2. N. H. Lindner, G. Refael, and V. Galitski, "Floquet Topological insulator in semiconductor quantum wells," Nat. Phys. Vol. 7, pp. 490-495, 2011. [DOI:10.1038/nphys1926]
3. T. Ma, A. B. Khanikaev, S. H. Mousavi, and G. Shvets, "Guiding electromagnetic waves around sharp corners: Topologically protected photonic transport in metawaveguides," Phys. Rev. Lett. Vol. 114, pp. 12740 (1-7), 2015. [DOI:10.1103/PhysRevLett.114.127401]
4. X.-L. Qi and Sh.-Ch. Zhang, "Topological insulators and superconductors," Rev. Modern Phys. Vol. 83, pp. 1057-1110, 2011. [DOI:10.1103/RevModPhys.83.1057]
5. S. A. Skirlo, L. Lu, and M. Soljačić, "Multimode one-way waveguides of large chern numbers," Phys. Rev. Lett. Vol. 113, pp. 113904-113909, 2014. [DOI:10.1103/PhysRevLett.113.113904]
6. Z. Wang and S. Fan, "Optical circulators is two-dimensional magneto-optical photonic crystals," Opt. Lett. Vol. 30, pp. 1989-1991, 2005. [DOI:10.1364/OL.30.001989]
7. P. Wang, L. Lu, and K. Bertoldi, "Topological phononic crystals with one-way elastic edge waves," Phys. Rev. Lett. Vol. 115, pp. 104302-104307, 2015. [DOI:10.1103/PhysRevLett.115.104302]
| Rights and permissions | |
 |
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |