Characteristic band gap structures of high dielectric contrast photonic crystals

2011 ◽  
Vol 1343 ◽  
Author(s):  
Sheng D. Chao ◽  
Hsin Y. Peng
Keyword(s):  
Photonic Crystals ◽  
Band Gap ◽  
Hexagonal Lattice ◽  
Dispersion Curves ◽  
Band Gaps ◽  
Circular Cylinders ◽  
Change Characteristics ◽  
Dielectric Contrast ◽  
Full Band ◽  
High Dielectric

ABSTRACTConventional photonic crystals exhibit low-lying full band gaps for the dielectric contrast smaller than 15. As the dielectric contrast increases, the band gap patterns change characteristics and exhibit interesting properties. In particular, the dispersion curves near the band gap region become concentrated to the middle band frequencies and exhibit an overall red shift in frequency. For a dielectric column photonic crystal made of a hexagonal lattice of circular cylinders, the maximum full band gap was found at the dielectric contrast as high as 27.5, which is attainable by using ceramics materials. The gap opens at high-lying bands, has simultaneous TM and TE band edges, and exhibit flattened dispersion curves near the band edges.

Band gap analysis and holographic design of 3-fold hybrid triangular photonic crystals of irregular columns with large full band gaps

2007 ◽  
Vol 9 (5) ◽  
pp. 531-536 ◽  
Author(s):  
Guo-Yan Dong ◽  
Xiu-Lun Yang ◽  
Lu-Zhong Cai ◽  
Xiao-Xia Shen ◽  
Xiang-Feng Meng ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Band Gap ◽  
Gap Analysis ◽  
Band Gaps ◽  
Full Band ◽  
Irregular Columns

Effect of Double Defects on Transmission Spectra of One-Dimensional Photonic Crystals

2010 ◽  
Vol 663-665 ◽  
pp. 725-728 ◽  
Author(s):  
Yuan Ming Huang ◽  
Qing Lan Ma ◽  
Bao Gai Zhai ◽  
Yun Gao Cai
Keyword(s):  
Photonic Crystals ◽  
Band Gap ◽  
Theoretical Calculations ◽  
Stop Band ◽  
Band Gaps ◽  
Characteristic Matrix ◽  
Frequency Range ◽  
Defect Band ◽  
One Dimensional ◽  
The One

Considered the model of the one-dimensional photonic crystals (1-D PCs) with double defects, the refractive indexes (n2’, n3’ and n2’’, n3’’) of the double defects were 2.0, 4.0 and 4.0, 2.0 respectively. With parameter n2=1.5, n3=2.5, by theoretical calculations with characteristic matrix method, the results shown that for a certain number (14 was taken) of layers of the 1-D PCs, when the double defects abutted, there was a defect band gap in the stop band gap, while when the double defects separated, there occurred two defect band gaps in the stop band gap; besides, with the separation of the two defects, the transmittance of the double defect band gaps decreased gradually. In addition, in this progress, the frequency range of the stop band gap has a little increase from 0.092 to 0.095.

Full Band Gap in Fcc and Bcc Photonic Band Gaps Structure: Non–Spherical Atom

1998 ◽  
Vol 67 (9) ◽  
pp. 3288-3291 ◽  
Author(s):  
Zhi-Yuan Li ◽  
Jian Wang ◽  
Ben-Yuan Gu
Keyword(s):  
Band Gap ◽  
Band Gaps ◽  
Photonic Band Gaps ◽  
Full Band ◽  
Photonic Band

Light emission from thin opaline photonic crystals of low and high dielectric contrast

2001 ◽  
Vol 124 (1) ◽  
pp. 131-135 ◽  
Author(s):  
Sergei G. Romanov ◽  
Torsten Maka ◽  
Clivia M.Sotomayor Torres ◽  
Manfred Müller ◽  
Rudolf Zentel
Keyword(s):  
Photonic Crystals ◽  
Light Emission ◽  
Dielectric Contrast ◽  
High Dielectric

Silica photonic crystals with quasi-full band gap in the visible region prepared in ethanol *

2003 ◽  
Vol 13 (9) ◽  
pp. 717-720 ◽  
Author(s):  
Hui Zhang ◽  
Xidong Wang ◽  
Xiaofeng Zhao ◽  
Wenchao Li ◽  
Qing Tang
Keyword(s):  
Photonic Crystals ◽  
Band Gap ◽  
Visible Region ◽  
Full Band

scholarly journals Study on the Photonic Band Gaps of the Face Centered Cubic Crystals

2016 ◽  
Vol 70 ◽  
pp. 63-75
Author(s):  
K.B.S.K.B. Jayawardana ◽  
K.A.I.L. Wijewardena Gamalath
Keyword(s):  
Photonic Crystals ◽  
Band Gap ◽  
Filling Factor ◽  
Dielectric Material ◽  
Dielectric Materials ◽  
Face Centered Cubic ◽  
Gap Ratio ◽  
Dielectric Contrast ◽  
Dielectric Spheres ◽  
Face Centered

Since the dielectric contrast of photonic crystals play an important role in determining the existence of a photonic gap, the photonic energy bands, density of states of face centered cubic structured photonic crystals formed from spheres of several dielectric materials placed in air were calculated using the plane wave expansion method. A complete band gap was obtained between second and third bands with a gap to mid gap frequency ratio in the range for the dielectric contrast in the range 11-16 with dielectric spheres of radius with a filling factor of 0.134 and fordielectric contrast of 200 with . A complete gap was not found for the dielectric contrast of 3.9. A complete band gap can be obtained for filling factors for the dielectric contrast in the range with an optimum band gap for the filling factor 0.134 while GaAs () has almost a constant optimum band gap in this range. The largest gap to mid gap ratio of was obtained for GaP (). For dielectric spheres of and larger gap to mid gap ratio were obtained for the dielectric contrast while the largest were obtained for . The only dielectric material BaSrTiO3 () which gives a band gap for the filling factor of 0.4524 can be used in microwave applications.

scholarly journals High Refractive Index Inverse Vulcanized Polymers for Organic Photonic Crystals

Crystals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 154 ◽  
Author(s):  
Christian Tavella ◽  
Paola Lova ◽  
Martina Marsotto ◽  
Giorgio Luciano ◽  
Maddalena Patrini ◽  
...  
Keyword(s):  
Refractive Index ◽  
Photonic Crystals ◽  
Photonic Band Gap ◽  
High Refractive Index ◽  
Melt Processing ◽  
Added Value ◽  
New Approach ◽  
Dielectric Contrast ◽  
High Dielectric ◽  
Photonic Band

Photonic technologies are nowadays dominated by highly performing inorganic structures that are commonly fabricated via lithography or epitaxial growths. Unfortunately, the fabrication of these systems is costly, time consuming, and does not allow for the growth of large photonic structures. All-polymer photonic crystals could overcome this limitation thanks to easy solubility and melt processing. On the other hand, macromolecules often do not offer a dielectric contrast large enough to approach the performances of their inorganic counterparts. In this work, we demonstrate a new approach to achieve high dielectric contrast distributed Bragg reflectors with a photonic band gap that is tunable in a very broad spectral region. A highly transparent medium was developed through a blend of a commercial polymer with a high refractive index inverse vulcanized polymer that is rich in sulfur, where the large polarizability of the S–S bond provides refractive index values that are unconceivable with common non-conjugated polymers. This approach paves the way to the recycling of sulfur byproducts for new high added-value nano-structures.

Drilled alternating-layer structure for three-dimensional photonic crystals with a full band gap

2000 ◽  
Vol 18 (6) ◽  
pp. 3510 ◽  
Author(s):  
Eiichi Kuramochi ◽  
Masaya Notomi ◽  
Toshiaki Tamamura ◽  
Takayuki Kawashima ◽  
Shojiro Kawakami ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Band Gap ◽  
Layer Structure ◽  
Three Dimensional ◽  
Full Band

Photonic band gap effect and dye-encapsulated cucurbituril-triggered enhanced fluorescence using monolithic colloidal photonic crystals

2019 ◽  
Vol 43 (41) ◽  
pp. 16264-16272 ◽  
Author(s):  
V. V. Vipin ◽  
Parvathy R. Chandran ◽  
Animesh M. Ramachandran ◽  
A. P. Mohamed ◽  
Saju Pillai
Keyword(s):  
Photonic Crystals ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Band Gaps ◽  
Gap Effect ◽  
Photonic Band Gaps ◽  
Enhanced Fluorescence ◽  
Colloidal Photonic Crystals ◽  
Photonic Band ◽  
Guest Chemistry

Enhanced fluorescence was achieved by tuning the photonic band gaps in colloidal photonic crystals and host–guest chemistry.

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