Optical properties of edge dislocations on (11¯00) prismatic planes in wurtzite ZnO introduced at elevated temperatures

2012 ◽  
Vol 111 (11) ◽  
pp. 113514 ◽  
Author(s):  
Y. Ohno ◽  
Y. Tokumoto ◽  
I. Yonenaga ◽  
K. Fujii ◽  
T. Yao
Keyword(s):  
Optical Properties ◽  
Elevated Temperatures ◽  
Edge Dislocations

scholarly journals Optical properties of AlN and GaN in elevated temperatures

2004 ◽  
Vol 85 (16) ◽  
pp. 3489-3491 ◽  
Author(s):  
K. B. Nam ◽  
J. Li ◽  
J. Y. Lin ◽  
H. X. Jiang
Keyword(s):  
Optical Properties ◽  
Elevated Temperatures

Synthesis and Second-Order Nonlinear Optical Properties of New Coumaromethacrylate-Methylmethacrylate Copolymers

1989 ◽  
Vol 173 ◽  
Author(s):  
R. A. Henry ◽  
J. M. Hoover ◽  
A. Knoesen ◽  
S. T. Kowel ◽  
G. A. Lindsay ◽  
...  
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Elevated Temperatures ◽  
Second Harmonic ◽  
Second Order ◽  
Nonlinear Optical Properties ◽  
Glass Transitions ◽  
Copolymer Films ◽  
New Family ◽  
Polymerizable Group

ABSTRACTThe synthesis and second-order nonlinear optical (NLO) properties of a new family of optically nonlinear coumarin dye-containing polymers is reported. Polymerizable coumaromethacrylate (CMA) monomers having various alkyl spacers (C2 to C5) between the polymerizable group and the chromophore were prepared and copolymerized with methylmethacrylate (MMA) and other vinyl monomers. The CMA copolymers had high chromophoric content (up to 18 × 1020) and glass transitions as high as 132°C. Spin cast films were prepared on BK7 substrates and oriented by corona-onset poling at elevated temperatures (COPET). The poled CMA copolymer films were characterized for spectroscopic absorption and second harmonic properties. A comparison of the nonlinear optical properties of poled CMA-MMA copolymers to poled guest-host systems is made. Relative to guest/host systems, CMA-MMA copolymer films exhibit larger and much more stable second-order nonlinear optical properties.

Optical properties of dislocations in wurtzite ZnO single crystals introduced at elevated temperatures

2008 ◽  
Vol 104 (7) ◽  
pp. 073515 ◽  
Author(s):  
Y. Ohno ◽  
H. Koizumi ◽  
T. Taishi ◽  
I. Yonenaga ◽  
K. Fujii ◽  
...  
Keyword(s):  
Optical Properties ◽  
Single Crystals ◽  
Elevated Temperatures

Effect of trimethylgallium flow on the structural and optical properties of InGaN/GaN multiple quantum wells

2004 ◽  
Vol 37 (3) ◽  
pp. 391-394 ◽  
Author(s):  
J. C. Zhang ◽  
J. F. Wang ◽  
Y. T. Wang ◽  
M. Wu ◽  
J. P. Liu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Dislocation Density ◽  
Quantum Wells ◽  
Chemical Vapour ◽  
Interface Roughness ◽  
Multiple Quantum Wells ◽  
Structural Defects ◽  
Organic Chemical ◽  
Multiple Quantum ◽  
Edge Dislocations

InGaN/GaN multiple quantum wells (MQWs) are grown by metal-organic chemical vapour deposition on (0001) sapphire substrates. Triple-axis X-ray diffraction (TXRD) and photoluminescence (PL) spectra are used to assess the influence of trimethylgallium (TMGa) flow on structural defects, such as dislocations and interface roughness, and the optical properties of the MQWs. In this paper, a method, involving an ω scan of every satellite peak of TXRD, is presented to measure the mean dislocation density of InGaN/GaN MQWs. The experimental results show that under certain conditions which keep the trimethlyindium flow constant, dislocation density and interface roughness decrease with the increase of TMGa flow, which will improve the PL properties. It can be concluded that dislocations, especially edge dislocations, act as non-radiative recombination centres in InGaN/GaN MQWs. Also noticed is that changing the TMGa flow has more influence on edge dislocations than screw dislocations.

Lattice Bending in Poly(Diacetylene) Droplets Near Surfaces

1992 ◽  
Vol 247 ◽  
Author(s):  
Patricia M. Wilson ◽  
David C. Martin
Keyword(s):  
Optical Properties ◽  
Crystal Lattice ◽  
Amorphous Carbon ◽  
Room Temperature ◽  
Droplet Surface ◽  
Molecular Organization ◽  
Direct Imaging ◽  
Chain Axis ◽  
Carbon Coated ◽  
Edge Dislocations

ABSTRACTDroplets of l, 6-di(N-carbazolyl)-2, 4 hexadiyne (DCHD) diacetylene were prepared by room temperature evaporation of dilute (0.01 wt %) solution of the monomer in chloroform on amorphous carbon-coated mica substrates. HREM and SAED examination revealed small crystallographically textured droplets (∼1 μm diameter) with cracks parallel to the [001] chain direction. The droplet geometry allowed us to investigate the structure of the polymer near edges both parallel and perpendicular to the chain axis. It was found that the curvature of the droplet edge caused a local bending of the polymer crystal lattice. The direct imaging of the molecular organization near the droplet surface allowed an investigation of the mechanisms of lattice bending via the formation of edge dislocations. An understanding of these defects is important in determining how they relate to the optical properties of poly(diacetylenes).

Optical Properties of a Polyimide for Waveguide Applications in On-Chip Interconnects

1999 ◽  
Vol 597 ◽  
Author(s):  
N. Agarwal ◽  
X. Huang ◽  
P. Persans ◽  
J. Plawsky ◽  
S. Ponoth ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Elevated Temperatures ◽  
Scattered Light ◽  
Optical Loss ◽  
Temperature Stability ◽  
Characterization Methods ◽  
On Chip ◽  
The Stability ◽  
Coupling Angle

AbstractIn this work. we report on characterization methods and the optical properties of a polyimide (Ultradel 9020D). The prism coupling technique was used to couple light into polyimide thin films. The scattered light from the surface was imaged to determine the optical loss at different wavelengths. The coupling angle was used to find the refractive index of the films. The stability of the polymer in terms of refractive index and absorption losses was studied by heat treatment under nitrogen at elevated temperatures. No significant change was observed in the properties of the film at annealing temperatures below 200°C. The bulk and surface losses were separated and it was found that the waveguide losses were dominated by bulk losses. Temperature stability of the polymer was evaluated by annealing the polymer at 125°C for up to 30 hours. No significant changes were seen in the optical losses for these times.

Optical properties of gold thin films at elevated temperatures

2016 ◽  
Author(s):  
Harsha Reddy ◽  
Urcan Guler ◽  
Alexander V. Kildishev ◽  
Alexandra Boltasseva ◽  
Vladimir M. Shalaev
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Elevated Temperatures ◽  
Gold Thin Films
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