Volume 111, Number 5, September 2015
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||21 September 2015|
Waveguide-mode polarization gaps in square spiral photonic crystals
1 Department of Physics, University of Toronto - 60 St. George St., Toronto, Ontario, M5S1A7 Canada
2 Institute of Physics, Chinese Academy of Sciences - Beijing, 100190 China
3 Department of Physics, King Abdulaziz University - Jeddah, Saudi Arabia
Received: 1 April 2015
Accepted: 24 August 2015
We designed waveguide channels in two types of square spiral photonic crystals. Wide polarization gaps, in which only one circular polarization wave is allowed while the other counter-direction circular polarization wave is forbidden, can be opened up on the waveguide modes within the fundamental photonic band gap according to the calculation of band structures and transmission spectra. This phenomenon is ascribed to the chirality of the waveguide and is independent of the chirality of the background photonic crystal. Moreover, the transmission spectra show a good one-way property of the waveguide channels. The chiral quality factor demonstrates the handedness of the allowed and impeded chiral waveguide modes, and further proved the property of the waveguide-mode polarization gap. Such waveguides with waveguide-mode polarization gap are a good candidate for one-way waveguides with robust backscattering-immune transport.
PACS: 42.70.Qs – Photonic bandgap materials / 42.25.Ja – Polarization / 42.79.Gn – Optical waveguides and couplers
© EPLA, 2015
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