Nonlinear optical polyimides consisting of chromophore-containing dendrons with site-isolation effect

2009 ◽  
Vol 20 (5) ◽  
pp. 493-500 ◽  
Author(s):  
Yung-Chung Chen ◽  
Huey-Ling Chang ◽  
Rong-Ho Lee ◽  
Shenghong A. Dai ◽  
Wen-Chiung Su ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Isolation Effect ◽  
Site Isolation

Unravelling the role of active-site isolation in reactivity and reaction pathway control for acetylene hydrogenation

2020 ◽  
Vol 56 (47) ◽  
pp. 6372-6375
Author(s):  
Siyang Liu ◽  
Yiming Niu ◽  
Yongzhao Wang ◽  
Junnan Chen ◽  
Xueping Quan ◽  
...  
Keyword(s):  
Active Site ◽  
Bimetallic Catalysts ◽  
Reaction Pathway ◽  
Isolation Effect ◽  
Site Isolation ◽  
Acetylene Hydrogenation ◽  
Supported Pd

Supported PdxCuy bimetallic catalysts were prepared and characterized to illustrate the active-site isolation effect on controlling the reactivity and reaction pathway of acetylene hydrogenation.

A rigid ringlike molecule: large second-order nonlinear optical performance, good temporal and thermal stability, and ideal spherical structure conforming to the “site isolation” principle

2018 ◽  
Vol 6 (25) ◽  
pp. 6784-6791 ◽  
Author(s):  
Pengyu Chen ◽  
Guangchao Liu ◽  
Huanyu Zhang ◽  
Meng Jin ◽  
Mengmeng Han ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Nonlinear Optical ◽  
Second Order ◽  
Optical Performance ◽  
Site Isolation ◽  
Spherical Structure

Ringlike molecule R1 containing two FTC moieties exhibited excellent EO performance (d33 = 562 pm V−1 @1950 nm, T80% = 145 °C).

Reinforced Site Isolation Leading to Remarkable Thermal Stability and High Electrooptic Activities in Cross-Linked Nonlinear Optical Dendrimers

2008 ◽  
Vol 20 (20) ◽  
pp. 6372-6377 ◽  
Author(s):  
Zhengwei Shi ◽  
Jingdong Luo ◽  
Su Huang ◽  
Xing-Hua Zhou ◽  
Tae-Dong Kim ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Nonlinear Optical ◽  
Site Isolation

Roughness measurements of nonlinear optical polymer films by scanning tunneling microscopy

1989 ◽  
Vol 47 ◽  
pp. 22-23
Author(s):  
I. H. Musselman ◽  
R.-T. Chen ◽  
P. E. Russell
Keyword(s):  
Surface Roughness ◽  
Scanning Tunneling Microscopy ◽  
Nonlinear Optical ◽  
Polymer Surface ◽  
Light Extinction ◽  
Scanning Tunneling ◽  
Silicon Substrates ◽  
Tunneling Microscopy ◽  
Optical Polymer ◽  
Total Light

Scanning tunneling microscopy (STM) has been used to characterize the surface roughness of nonlinear optical (NLO) polymers. A review of STM of polymer surfaces is included in this volume. The NLO polymers are instrumental in the development of electrooptical waveguide devices, the most fundamental of which is the modulator. The most common modulator design is the Mach Zehnder interferometer, in which the input light is split into two legs and then recombined into a common output within the two dimensional waveguide. A π phase retardation, resulting in total light extinction at the output of the interferometer, can be achieved by changing the refractive index of one leg with respect to the other using the electrooptic effect. For best device performance, it is essential that the NLO polymer exhibit minimal surface roughness in order to reduce light scattering. Scanning tunneling microscopy, with its high lateral and vertical resolution, is capable of quantifying the NLO polymer surface roughness induced by processing. Results are presented below in which STM was used to measure the surface roughness of films produced by spin-coating NLO-active polymers onto silicon substrates.

The Isolation Effect in Children: A Conceptual and Perceptual Isolate

2007 ◽  
Author(s):  
Melissa D. McConnell ◽  
Stephanie E. Miller ◽  
Stuart Marcovitch
Keyword(s):  
Isolation Effect

Investigating the Nonlinear Optical Response of Pepper Oil under Low Power Irradiation with Continuous Wave Visible Laser Beam

2020 ◽  
pp. 131-138
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Nonlinear Optical ◽  
Continuous Wave ◽  
Diffraction Integral ◽  
Visible Laser ◽  
Limiting Property ◽  
Kirchhoff Diffraction Integral ◽  
Theoretical Results ◽  
Good Agreement

The nonlinear optical properties of pepper oil are studied by diffraction ring patterns and Z-scan techniques with continuous wave beam from solid state laser at 473 nm wavelength. The nonlinear refractive index of the sample is calculated by both techniques. The sample show high nonlinear refractive index. Based on Fresnel-Kirchhoff diffraction integral, the far-field intensity distributions of ring patterns have been calculated. It is found that the experimental results are in good agreement with the theoretical results. Also the optical limiting property of pepper oil is reported. The results obtained in this study prove that the pepper oil has applications in nonlinear optical devices.

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