Ternary comb-like silicon photonic crystal: Oxidation, intrinsic modes, reflection windows and contrastivity
A ternary photonic crystal - A/B/A/C periodic structure is investigated analytically and numerically in the framework of transfer matrix formalism. The influence of oxidation to photonic gaps and positions of reflection windows for (SiO2/Si/SiO2/Air)N structure is calculated. It was shown that intrinsic optical contrastivity has a non-monotone behavior during the process of oxidation of silicon. The found results will allow to determine the optimal regimes of oxidation to obtain needed photonic device properties.
Optical contrastivity and sensitivity of multicomponent ordered structures
Abstract We discuss the definition of an intrinsic optical contrastivity for a complicated structure as a relative total gap taken over a chosen range of frequencies. An optical material contrast sensitivity to the variation of parameters is analyzed for a wide area. The contrastivity and sensitivity parametric maps are calculated for 1D combs with various fillings. The existence of highly sensitive areas on the parametric maps to contrast deviations is shown for different materials. It is shown that for the found parameters the photonic band edge shifts are of the order of 0.3–0.5 eV/bar for glass, silicon and microporous silicon matrices.
Reciprocal invisibility cloak based on complementary media
Abstract.
The first invisibility cloak was proposed by Pendry et al. [Science 312, 1780 (2006)]. But the object enclosed in this original cloak is “blind", that is, it cannot see the outside world, since no electromagnetic waves can reach within the cloaked space. Based on the concept of complementary media, we propose a reciprocal invisibility cloak, in which the hidden object can see the outside world, but its presence cannot be detected by electromagnetic wave. The performance of the cloak has been verified by full-wave simulations.
