One-dimensional photonic crystals with a planar oriented nematic layer: Temperature and angular dependence of the spectra of defect modes

Journal Article · Fri Feb 15 00:00:00 EST 2008 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776108020179· OSTI ID:22028225

Gunyakov, V A; Myslivets, S A; Gerasimov, V P; Zyryanov, V Ya ^[1]; Vetrov, S Ya ^[2]; Shabanov, V F ^[1]

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1. Russian Academy of Sciences, Kirenskii Institute of Physics, Siberian Branch (Russian Federation)
2. Siberian Federal University (Russian Federation)

Transmission spectra of a one-dimensional photonic crystal (PC) formed by two multilayer dielectric mirrors and a planar oriented layer of 5CB nematic liquid crystal (LC) that is sandwiched between these mirrors and serves as a structure defect are investigated experimentally. Specific features of the behavior of the spectrum of defect modes as a function of the angle of incidence of light on the crystal are studied for two polarizations: parallel and perpendicular to the director of the LC; the director either lies in the plane of incidence or is perpendicular to it. It is shown that, for the configurations considered, the maxima of the defect modes shift toward the short-wavelength region as the tilt angle of incidence radiation increases; this tendency is more manifest for the parallel-polarized component, when the director lies in the plane of incidence. In the latter case, the width of the photonic band gap (PBG) appreciably decreases. The temperature dependence of the polarization components of the transmission spectra of a PC is investigated in the case of normal incidence of light. The spectral shift of defect modes due to the variation of the refractive index of the LC at the nematic-isotropic liquid phase transition point is measured. It is shown that, in real PCs, the amplitude of defect modes decreases when approaching the center of the band gap, as well as when the number of layers in the dielectric mirrors increases. Theoretical transmission spectra of the PCs calculated by the method of recurrence relations with regard to the decay of defect modes are in good agreement with experimental data.

• OSTI ID: 22028225
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 106, Issue 2; Other Information: Copyright (c) 2008 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIELECTRIC MATERIALS
ELECTRONIC STRUCTURE
ENERGY GAP
INCIDENCE ANGLE
LAYERS
LIQUID CRYSTALS
MIRRORS
PHASE TRANSFORMATIONS
POLARIZATION
RECURSION RELATIONS
REFRACTIVE INDEX
SPECTRA
SPECTRAL SHIFT
TEMPERATURE DEPENDENCE
VARIATIONS
VISIBLE RADIATION