Photonic Band Gap Crystals
Photonic Band Gap Crystals
... based on the Photonic Band Gap
(PBG) effect.
Summary
• Physics of photonic bandgap crystals.
• Photonic Crystals Classification.
• Fabrication.
• Applications.
• Protoype photonic band gap devices.
• ... incoming
wave.
(3) This should happen in all possible directions for a full 2D bandgap.
3D PBG crystals
3D photonic bandgaps are observed in
•
Diamond structure.
•
Yab...
Nature of the band gap of silicon and germanium nanowires
... bulk band gap, whereas the zone centre
band gaps for (1 0 0) and (1 1 0) Ge nanowires clearly
converge to different bulk band gap values. The (1 0 0) gap
converges towards the G2X band gap, while ... bulk band
gap. The Ge nanowires converge towards different band
gaps: (1 1 0) towards the G 2L gap, whereas (1 0 0) and
(1 1 1) nanowires converge towards the G2X value.
Figs....
Báo cáo "The role of color luminescence centers Mn, Cu, Co in the semicondutors with wide band gap ZnS, ZnO and their applications " pptx
... photoluminescence (PL) spectra of ZnS materials include two wide
luminescence bands at around 460 nm (blue band) and 515 nm (green band) . These bands are
characterized by the vacancies of Zn bonding to Cl (V
Zn
-Cl) ...
except a blue band at 476 nm, there is one more green band at around 533 nm characterized by Cu
2+
ions (Fig. 3). Intensity of the green band is greater than tha...
study of blueshift of optical band gap in zinc oxide (zno) nanoparticles
... of band gap energy E
g
. The optical band gap (E
g
) is found
to be size dependent and there is an increase in the band gap of
the semiconductor with a decrease in particle size. The optical
band ... chemical method. The direct band gap of ZnO colloid is
estimated from the graph of hν versus (αhν)
2
through the absorp-
tion coefficient α which is related to the band gap E...
ADVANCES IN PHOTONIC CRYSTALS pptx
... wavelengths 1504 nm to 1521 nm whose corresponding bands are denoted as
Band I and Band II, respectively. The center wavelength and FWHM bandwidth of these
bands are 1420 nm and 1512.5 nm, and 20 nm ... shown in Figure 2(a).
Figure 1. Geometrical shapes of photonic crystals (a) 1D (b) 2D and (c) 3D
Figure 2. Schematic illustrations of photonic crystals (a) 1D (b) 2D and (c) 3D
The...
