Peculiarities of Tamm states formed in degenerate photonic band gaps

Autor:	David J. Bergman, A. M. Merzlikin, A. P. Vinogradov, Miguel Levy, Yakov M. Strelniker, Andrey N. Lagarkov
Rok vydání:	2010
Předmět:	Physics Condensed matter physics Band gap Degenerate energy levels Isotropy Physics::Optics Condensed Matter Physics Electronic Optical and Magnetic Materials Brillouin zone Quantum mechanics Wavenumber Electrical and Electronic Engineering Photonic crystal Surface states Bloch wave
Zdroj:	Physica B: Condensed Matter. 405:2986-2989
ISSN:	0921-4526
DOI:	10.1016/j.physb.2010.01.019
Popis:	The structure of the Tamm state localized at the interface between anisotropic magnetophotonic crystal (anisotropic MPC) and a photonic crystal (PC) made of isotropic dielectrics is studied. It is shown that if the frequency of this state appears within the degenerate band gap then its structure qualitatively differs from the structure of a well-known Tamm state localized at the interface between two one-dimensional PC made of isotropic materials. Since inside the degenerate BG the real part of the Bloch wavenumber differs from the Brillouin value, two Bloch waves with different signs in the real part of the wavenumber and the same sign in the imaginary part have different input impedance values. Moreover, contrary to the case of a PC made of isotropic materials the impedance of each Bloch wave is a tensor. As a consequence to construct a surface state at least three evanescent Bloch waves are required. The conditions that determine the Tamm state frequency also change.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3a72601b67de3e92ebbc270216f7fd73 https://doi.org/10.1016/j.physb.2010.01.019 Zobrazit plný text záznamu Full Text from ScienceDirect