scholarly journals THE OPTICAL PROPERTIES OF MULTILAYER PERIODIC STRUCTURES BaTiO3:Eu/SiO2

Doklady BGUIR ◽  
2019 ◽  
pp. 95-100
Author(s):  
D. A. Parafinyuk ◽  
N. V. Gaponenko ◽  
T. F. Raichenok
Keyword(s):  
Optical Properties ◽  
Periodic Structures ◽  
Photonic Band Gap ◽  
Bragg Reflector ◽  
Wavelength Shift ◽  
Excitation Spectra ◽  
Synthesis Conditions ◽  
Long Wavelength ◽  
Kinetics Of ◽  
Photonic Band

This paper presents the study of the optical properties of multilayer periodic structures, such as Bragg reflector, with different synthesis conditions. Transmission, reflection, luminescence, luminescence excitation spectra and kinetics of luminescence are presented for the Bragg reflectors formed on quartz with 6 and 12 alternating layers BaTiO3:Eu/SiO2. The structures demonstrate photonic band gap and its long wavelength shift with increasing number of layers. Europium luminescence with the most intensive band at 615 nm is observed from the structures. A decrease in the luminescence intensity with increasing the number of pairs of the layers in the structure is observed.

Modulation of Three Dimensional Photonic Band Gap in Visible Region

2007 ◽  
Vol 31 ◽  
pp. 20-22 ◽  
Author(s):  
Y.P. Liu ◽  
Y.P. Guo ◽  
Z.J. Yan ◽  
C.M. Huang ◽  
Y.Y. Wang
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Bragg Reflection ◽  
Quartz Substrate ◽  
Three Dimensional ◽  
Visible Region ◽  
Sphere Size ◽  
Vertical Deposition Method ◽  
Photonic Band

Three dimensional (3D) SiO2 photonic crystals films were fabricated on quartz substrate by vertical deposition method. The effects of various preparation parameters on optical properties were studied by optical transmission measurements. Bragg reflection on parallel sets of (111) planes were observed in all the samples. The center wavelength of [111] photonic band gap (PBG) varied from 450 nm to 680 nm with the increasing sphere size. For a given sphere size, the (111) Bragg reflection of as-deposited sample shifted towards lower wavelengths as the sintering temperature T increased. The role of evaporation temperature on the optical properties of the film was also investigated. The PBG can be correspondingly modulated in visible region by changing various preparation parameters.

Photonic band gap from periodic structures containing anisotropic nonmagnetic left-handed metamaterial

2010 ◽  
Vol 8 (4) ◽  
pp. 431-434 ◽  
Author(s):  
唐婷婷 Tingting Tang ◽  
陈福深 Fushen Chen ◽  
孙豹 Bao Sun
Keyword(s):  
Band Gap ◽  
Periodic Structures ◽  
Photonic Band Gap ◽  
Left Handed ◽  
Photonic Band

Silicon Periodic Structures and their Liquid Crystal Composites

2009 ◽  
Vol 156-158 ◽  
pp. 547-554 ◽  
Author(s):  
Ekaterina V. Astrova ◽  
V.A. Tolmachev ◽  
Yulia A. Zharova ◽  
Galya V. Fedulova ◽  
A.V. Baldycheva ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Periodic Structures ◽  
Electrochemical Etching ◽  
Photonic Band Gap ◽  
Side Wall ◽  
Reflection And Transmission ◽  
One Dimensional ◽  
Advantages And Disadvantages ◽  
Infra Red ◽  
Photonic Band

This paper summarises results on the design, fabrication and characterisation of one-dimensional (1D) Photonic Crystals (PCs) for silicon micro-photonics. Anisotropic and photo-electrochemical etching were used to obtain silicon wall arrays with a high aspect ratio. The characteristics of these wet etching techniques, including their advantages and disadvantages are considered. Optical reflection and transmission spectra of the photonic structures fabricated were characterised by Fourier Transform Infra-Red (FTIR) micro-spectroscopy over a wide spectral range of =1.5-14.5m. These measurements reveal that side-wall roughness impacts the optical properties of 1D PCs. Problems associated with Photonic Band-Gap (PBG) tuning in periodic structures infiltrated with nematic liquid crystals are discussed. A design of a composite 1D PC on an SOI platform for electro-tuning is proposed. The structure was fabricated and tuning due to an electro-optical effect with E7 liquid crystal filler was demonstrated.

Simulations of Realizable Photonic Bandgap Structures with High Refractive Contrast

2001 ◽  
Vol 694 ◽  
Author(s):  
Bonnie Gersten ◽  
Jennifer Synowczynski
Keyword(s):  
Periodic Structures ◽  
Photonic Band Gap ◽  
Three Dimensional ◽  
Face Centered Cubic ◽  
High Permittivity ◽  
Face Centered ◽  
Photonic Bandgap Structures ◽  
Photonic Band ◽  
Opal Crystal ◽  
Periodic Arrangement

AbstractThe transfer matrix method (TMM) software (Translight, A. Reynolds [1]) was used to evaluate the photonic band gap (PBG) properties of the periodic arrangement of high permittivity ferroelectric composite (40 wt% Ba0.45Sr0.55TiO3 /60 wt% MgO composite, εR= 80, tanδ = 0.0041 at 10 GHz) in air (or Styrofoam, εR~ 1) matrix compared to a lower permittivity material (Al2O3, εR= 11.54, tanδ = 0.00003 at 10 GHz) in air. The periodic structures investigated included a one-dimensional (1D) stack and a three-dimensional (3D) face centered cubic (FCC) opal structure. The transmission spectrum was calculated for the normalized frequency for all incident angles for each structure. The results show that the bandgaps frequency increased and the bandgap width increased with increased permittivity. The effects of orientation of defects in the opal crystal were investigated. It was found by introducing defects propagation bands were introduced. It was concluded that a full PBG is possible with the high permittivity material.

Sign in / Sign up

Export Citation Format

Share Document