Monodisperse SiO2 Nanospheres Prepared by Batch/Semibatch Process and Its Opals

2007 ◽  
Vol 121-123 ◽  
pp. 179-182
Author(s):  
Shi Cheng Zhang ◽  
Jie Chen ◽  
Xing Guo Li
Keyword(s):  
Standard Deviation ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Colloidal Crystals ◽  
Building Blocks ◽  
Band Gaps ◽  
Photonic Band Gaps ◽  
Size Standard ◽  
Photonic Band ◽  
Sio2 Spheres

Nearly monodispersed SiO2 nanospheres, with different size and size standard deviation smaller than 5%, have been prepared by using batch/semibatch process. The SiO2 colloids were used as building blocks to self-assemble into the colloidal crystals, which photonic band gaps are close to the theoretical values, and can be modified by changing the size SiO2 nanospheres. With the increase of the size of SiO2 spheres, the photonic band gap red shift.

scholarly journals Phoamtonic designs yield sizeable 3D photonic band gaps

2019 ◽  
Vol 116 (47) ◽  
pp. 23480-23486 ◽  
Author(s):  
Michael A. Klatt ◽  
Paul J. Steinhardt ◽  
Salvatore Torquato
Keyword(s):  
Band Gap ◽  
Volume Fraction ◽  
Photonic Band Gap ◽  
Three Dimensional ◽  
Band Gaps ◽  
Photonic Band Gaps ◽  
Photonic Networks ◽  
Photonic Waveguides ◽  
High Degree ◽  
Photonic Band

We show that it is possible to construct foam-based heterostructures with complete photonic band gaps. Three-dimensional foams are promising candidates for the self-organization of large photonic networks with combinations of physical characteristics that may be useful for applications. The largest band gap found is based on 3D Weaire–Phelan foam, a structure that was originally introduced as a solution to the Kelvin problem of finding the 3D tessellation composed of equal-volume cells that has the least surface area. The photonic band gap has a maximal size of 16.9% (at a volume fraction of 21.6% for a dielectric contrast ε=13) and a high degree of isotropy, properties that are advantageous in designing photonic waveguides and circuits. We also present results for 2 other foam-based heterostructures based on Kelvin and C15 foams that have somewhat smaller but still significant band gaps.

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.

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.

Photonic Band-Gaps in Porous Silicon Based Mirrors with a Ellipse Profile Refractive Index

2011 ◽  
Vol 236-238 ◽  
pp. 1811-1813
Author(s):  
Shuan Ming Li ◽  
Fu Ru Zhong ◽  
Zhen Hong Jia ◽  
Min Tian
Keyword(s):  
Refractive Index ◽  
Porous Silicon ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Unit Cell ◽  
Band Gaps ◽  
Index Structure ◽  
Photonic Band Gaps ◽  
Silicon Based ◽  
Photonic Band

We investigate the use of ellipse refractive index structure to enlarge photonic band-gap (PBG). The PBG structure was prepared on porous silicon with 10 unit cell. Each unit cell is consisting of 21 layers with the refractive index varying according to the envelope of the ellipse function. The width of this photonic band-gap is high to 451nm.

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

Experimental investigation of photonic band gap influence on enhancement of Raman-scattering in metal-dielectric colloidal crystals

2012 ◽  
Vol 112 (8) ◽  
pp. 084303 ◽  
Author(s):  
Sriram Guddala ◽  
Shadak Alee Kamanoor ◽  
Andrea Chiappini ◽  
Maurizio Ferrari ◽  
Narayana Rao Desai
Keyword(s):  
Experimental Investigation ◽  
Raman Scattering ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Colloidal Crystals ◽  
Photonic Band

Deformation of Colloidal Crystals for Photonic Band Gap Tuning

2011 ◽  
Vol 32 (10) ◽  
pp. 1408-1415 ◽  
Author(s):  
Young-Sang Cho ◽  
Young Kuk Kim ◽  
Kook Chae Chung ◽  
Chul Jin Choi
Keyword(s):  
Band Gap ◽  
Photonic Band Gap ◽  
Colloidal Crystals ◽  
Band Gap Tuning ◽  
Photonic Band

Modification of photonic crystals for obtaining common band gaps for TE and TM waves

2012 ◽  
Vol 90 (2) ◽  
pp. 175-180 ◽  
Author(s):  
M. Moghimi ◽  
S. Mirzakuchaki ◽  
N. Granpayeh ◽  
N. Nozhat ◽  
G.H. Darvish
Keyword(s):  
Photonic Crystals ◽  
Photonic Band Gap ◽  
Expansion Method ◽  
Band Gaps ◽  
Two Dimensional ◽  
Plane Wave Expansion ◽  
Photonic Band Gaps ◽  
Plane Wave Expansion Method ◽  
Common Band ◽  
Photonic Band

The band gaps of the two-dimensional photonic crystals, created by inhomogeneous triangular photonic crystal of variable central hexagonal holes are derived. The structure is made of air holes in GaAs. We present the best absolute photonic band gap for this structure by changing the holes’ radii. The photonic band gaps are calculated by the plane wave expansion method. The results indicate 95% overlap in the band gaps of both polarizations of TE and TM in triangular lattice.

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