Unidirectional band gaps in uniformly magnetized two-dimensional magnetophotonic crystals

Abstract

By exploiting the concepts of magnetic group theory we show how unidirectional behavior can be obtained in two-dimensional magneto-photonic crystals (MOPhC) with uniform magnetization. This group theory approach generalizes all previous investigations of one-way MOPhCs including those based on the use of antiparallel magnetic domains in the elementary crystal cell. Here, the theoretical approach is illustrated for one MOPhC example where unidirectional behavior is obtained by appropriately lowering the geometrical symmetry of the elementary motifs. One-way transmission is numerically demonstrated for a photonic crystal slice.

Near-complete violation of detailed balance in thermal radiation

“…4 we have e(ω, ±θ) = α(ω, ±θ), and thus detailed balance is satisfied. On the other hand, with the breaking of reciprocity, for example by the use of magneto-optical material, one can achieve an asymmetry of the photonic band structure in k x -space [41,[45][46][47][48], i.e. ω(k x ) = ω(−k x ).…”

Parity-time electromagnetic diodes in a two-dimensional nonreciprocal photonic crystal

“…Here, we focus on a unique photonic crystal (PC) structure, namely a nonreciprocal photonic crystal (NRPC), in which both P and T symmetries are broken. 27,28 The 2D NRPC of interest is composed of a square lattice of yttrium-iron-garnet (YIG) cylinders (permittivity ε = 15ε 0 , permeability μ = μ 0 , and radius r = 0.3a, where a is the lattice constant) embedded in an air medium.…”

Elliptical normal modes and stop band reconfiguration in multimode birefringent one-dimensional magnetophotonic crystals

“…The enhancement of Faraday rotation in onedimensional layered stacks with resonant cavities was reported in [1][2][3][4]. Other authors have studied the band dispersion of photonic crystals containing magnetically-ordered materials [5], and electromagnetic unidirectionality in periodic magnetic stacks and twodimensional magneto-photonic crystals [6,7]. Wang and Lakhtakia explored magnetically controllable band gaps in one-dimensional helicoidal magneto-photonic crystals [8].…”