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.

Simulations of Realizable Photonic Bandgap Structures with High Refractive Contrast

2001 ◽  
Vol 692 ◽  
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.

THE SIZE INFLUENCE OF SILICA MICROSPHERES ON PHOTONIC BAND GAP OF PHOTONIC CRYSTALS

2007 ◽  
Vol 21 (16) ◽  
pp. 2761-2768 ◽  
Author(s):  
XIYING MA ◽  
ZHIJUN YAN
Keyword(s):  
Photonic Crystals ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Three Dimensional ◽  
Refraction Index ◽  
Face Centered Cubic ◽  
Silica Microspheres ◽  
Large Shift ◽  
Face Centered ◽  
Photonic Band

The size influence of silica microspheres on the photonic band gap (PBG) of three-dimensional face-centered-cubic (fcc) photonic crystals (PCs) is studied by means of colloidal photonic crystals, which are self-assembled by the vertical deposition technique. Monodispersed SiO 2 microspheres with a diameter of 220–320 nm are synthesized using tetraethylorthosilicate (TEOS) as a precursor material. We find that the PBG of the PCs shifts from 450 nm to 680 nm with silica spheres increasing from 220 to 320 nm. In addition, the PBG moves to higher photon energy when the samples are annealed in a temperature range of 200–700°C. The large shift results from the decrease in refraction index of silica due to moisture evaporation.

Development of 3D Ceramic Photonic Bandgap Structures

2007 ◽  
Vol 280-283 ◽  
pp. 533-536
Author(s):  
Hai Qing Yin ◽  
Soshu Kirihara ◽  
Yoshinari Miyamoto
Keyword(s):  
Band Gap ◽  
Photonic Bandgap ◽  
Photonic Band Gap ◽  
Three Dimensional ◽  
Cold Isostatic Pressing ◽  
Tio2 Powder ◽  
Lower Range ◽  
Photonic Band Gap Material ◽  
Photonic Bandgap Structures ◽  
Photonic Band

The three-dimensional (3D) photonic band gap material is a material that there exists a full photonic band gap in which waves are forbidden to propagate whatever the polarization or the direction of propagation. In order to obtain photonic bandgap in lower range, we focus on the fabrication of PBG materials of diamond structure with TiO2 powder mixed with SiO2. The inverse epoxy structure with periodic diamond lattices in millimeter order has been fabricated by stereolithographic rapid prototyping. TiO2 slurry was filled into the epoxy structure and then cold isostatic pressing was applied. After sintering at 700K for 5hrs, the epoxy was burnt out and the designed structure was maintained perfectly. The calculated band diagram shows that there exists an absolute photonic band gap for all wave vectors. The measurement of transmission from 10 to 20 GHz in <100> direction shows that a complete band gap is formed at about 14.7-18.5 GHz. The magnitude of the maximum attenuation is as large as 30 dB at 17 GHz.

Photonic band gap in the face-centered cubic lattice of spherical shells connected by cylindrical tubes

2005 ◽  
Vol 72 (11) ◽  
Author(s):  
Hong-Bo Chen ◽  
Yong-Zheng Zhu ◽  
Yan-Ling Cao ◽  
Yan-Ping Wang ◽  
Yuan-Bin Chi
Keyword(s):  
Band Gap ◽  
Photonic Band Gap ◽  
Face Centered Cubic ◽  
Spherical Shells ◽  
Cubic Lattice ◽  
Cylindrical Tubes ◽  
The Face ◽  
Face Centered ◽  
Photonic Band

Exploring Space Groups for Three Dimensional Photonic Band Gap Structures Via Level Set Equations: The Face Centered Cubic Lattice

2003 ◽  
Vol 788 ◽  
Author(s):  
Martin Maldovan ◽  
Chaitanya K. Ullal ◽  
Craig W. Carter ◽  
Edwin L. Thomas
Keyword(s):  
Band Gap ◽  
Level Set ◽  
Photonic Band Gap ◽  
Band Gaps ◽  
High Symmetry ◽  
Face Centered Cubic ◽  
Photonic Band Gaps ◽  
Basic Set ◽  
Face Centered ◽  
Photonic Band

ABSTRACTA level set approach was used to study photonic band gaps for dielectric composites with symmetries of the eleven face centered cubic lattices. Candidate structures were modeled for each group by a 3D surface given by f(x,y,z)-t=0 obtained by equating f to an appropriate sum of structure factor terms. This approach allows us to easily map different structures and gives us an insight into the effects of symmetry, connectivity and genus on photonic band gaps. It is seen that a basic set of symmetries defines the essential band gap and connectivity. The remaining symmetry elements modify the band gap. The eleven lattices are classified into four fundamental topologies on the basis of the occupancy of high symmetry Wyckoff sites. Of the fundamental topologies studied, three display band gaps--- including two: the (F-RD) and a group 216 structure that have not been reported previously.

A hollow spherical non-closed-packed face-centered cubic uniaxial structure with a photonic band gap

2007 ◽  
Vol 369 (1-2) ◽  
pp. 124-127 ◽  
Author(s):  
Yan-Ling Cao ◽  
Yong-Zheng Zhu ◽  
Zhi-Hui Li ◽  
Juan Ding ◽  
Jun-Song Liu ◽  
...  
Keyword(s):  
Band Gap ◽  
Photonic Band Gap ◽  
Face Centered Cubic ◽  
Face Centered ◽  
Photonic Band

Fabrication and Optical Properties of Nb2O5 Inverse Opal Photonic Crystals by PS Opal Template

2011 ◽  
Vol 688 ◽  
pp. 90-94 ◽  
Author(s):  
Y.Q. Yang ◽  
P.D. Han ◽  
Y.P. Li ◽  
M.H. Dong ◽  
L.L. Zhang ◽  
...  
Keyword(s):  
Band Gap ◽  
Photonic Band Gap ◽  
Face Centered Cubic ◽  
Inverse Opal ◽  
Void Space ◽  
Inverse Opal Structure ◽  
Calculation Results ◽  
Face Centered ◽  
Vertical Deposition Method ◽  
Photonic Band

In this paper, polystyrene (PS) opals template, opal with a closed-packed face centered cubic (fcc) lattice, was prepared using vertical deposition method. The template provided void space for infiltration of Nb2O5 etc. PS colloidal nanospheres was face-centered-cubic (FCC) structure with its (111) planes parallel to the substrate. Finally, the transfer matrix method (TMM) was used to calculate photonic band-gap of PS opal and Nb2O5 inverse opal structure. The calculation results show that the photonic band-gap of Nb2O5 with inverse opal structure is wider than that of PS opals.

Epitaxial Ni nanoparticles on CaF2(001), (110) and (111) surfaces studied by three-dimensional RHEED, GIXD and GISAXS reciprocal-space mapping techniques

2017 ◽  
Vol 50 (3) ◽  
pp. 830-839 ◽  
Author(s):  
S. M. Suturin ◽  
V. V. Fedorov ◽  
A. M. Korovin ◽  
N. S. Sokolov ◽  
A. V. Nashchekin ◽  
...  
Keyword(s):  
Lattice Structure ◽  
Three Dimensional ◽  
Grazing Incidence ◽  
High Energy ◽  
Reciprocal Space ◽  
Mapping Technique ◽  
Face Centered Cubic ◽  
X Ray ◽  
Cubic Lattice ◽  
Face Centered

The development of growth techniques aimed at the fabrication of nanoscale heterostructures with layers of ferroic 3dmetals on semiconductor substrates is very important for their potential usage in magnetic media recording applications. A structural study is presented of single-crystal nickel island ensembles grown epitaxially on top of CaF2/Si insulator-on-semiconductor heteroepitaxial substrates with (111), (110) and (001) fluorite surface orientations. The CaF2buffer layer in the studied multilayer system prevents the formation of nickel silicide, guides the nucleation of nickel islands and serves as an insulating layer in a potential tunneling spin injection device. The present study, employing both direct-space and reciprocal-space techniques, is a continuation of earlier research on ferromagnetic 3dtransition metals grown epitaxially on non-magnetic and magnetically ordered fluorides. It is demonstrated that arrays of stand-alone faceted nickel islands with a face-centered cubic lattice can be grown controllably on CaF2surfaces of (111), (110) and (001) orientations. The proposed two-stage nickel growth technique employs deposition of a thin seeding layer at low temperature followed by formation of the islands at high temperature. The application of an advanced three-dimensional mapping technique exploiting reflection high-energy electron diffraction (RHEED) has proved that the nickel islands tend to inherit the lattice orientation of the underlying fluorite layer, though they exhibit a certain amount of {111} twinning. As shown by scanning electron microscopy, grazing-incidence X-ray diffraction (GIXD) and grazing-incidence small-angle X-ray scattering (GISAXS), the islands are of similar shape, being faceted with {111} and {100} planes. The results obtained are compared with those from earlier studies of Co/CaF2epitaxial nanoparticles, with special attention paid to the peculiarities related to the differences in lattice structure of the deposited metals: the dual-phase hexagonal close-packed/face-centered cubic lattice structure of cobalt as opposed to the single-phase face-centered cubic lattice structure of nickel.

scholarly journals PHOTONIC BAND STRUCTURE OF FACE CENTERED CUBIC LATTICE IN CHIRAL MEDIUM

1997 ◽  
Vol 46 (12) ◽  
pp. 2325
Author(s):  
JIN CHONG-JUN ◽  
QIN BAI ◽  
YANG MIAO ◽  
QIN RU-HU
Keyword(s):  
Band Structure ◽  
Chiral Medium ◽  
Face Centered Cubic ◽  
Photonic Band Structure ◽  
Cubic Lattice ◽  
Face Centered ◽  
Photonic Band
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