Volume 124, Number 6, December 2018
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||07 January 2019|
Topological interface modes in photonic superlattices containing negative-index materials
1 School of Physics and Telecommunication Engineering, South China Normal University Guangzhou 510006, China
2 Department of Electronic Information and Physics, Changzhi University - Changzhi, Shanxi 046011, China
3 School of Physics and Astronomy, Shanghai Jiao Tong University - Shanghai 200240, China
4 Department of Physics, Zhejiang Normal University - Jinhua 321004, China
Received: 22 October 2018
Accepted: 7 December 2018
We study the topological properties of one-dimensional photonic superlattices consisting of alternating layers of positive- and negative-index materials. We find that Zak phases of photonic bands of such superlattices are related to the signs of the spatial average of their permittivity and permeability, and the polarization of incident light. Specifically, the Zak phases for transverse electric (TE) waves (transverse magnetic (TM) waves) are determined by only the sign of the spatially averaged permittivity (permeability) of the lattices. Only a single-polarized (TM or TE) topological interface mode occurs at the interface between air and the superlattice with single-negative average permittivity or permeability. The crucial dependence of the topological property of the superlattice on the light polarization suggests a polarization filter application. The topologically protected interface modes for both TM and TE polarizations can coexist at the interface separating air and the superlattices with simultaneously negative signs of averaged permittivity and permeability. The robustness of such topological interface modes for both TM and TE polarizations is also demonstrated.
PACS: 42.70.Qs – Photonic bandgap materials / 42.25.Bs – Wave propagation, transmission and absorption
© EPLA, 2019
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.