scholarly journals Light mediated emergence of surface patterns in azopolymers at low temperatures

Soft Matter ◽  
2015 ◽  
Vol 11 (32) ◽  
pp. 6444-6449 ◽  
Author(s):  
V. Teboul ◽  
R. Barillé ◽  
P. Tajalli ◽  
S. Ahmadi-Kandjani ◽  
H. Tajalli ◽  
...  
Keyword(s):  
Thin Films ◽  
Time Scales ◽  
Formation Mechanism ◽  
Low Temperatures ◽  
Surface Relief ◽  
Polymer Thin Films ◽  
Polarized Beam ◽  
Surface Patterns ◽  
Surface Relief Gratings ◽  
Short Time

Polymer thin films doped with azobenzene molecules do have the ability to organize themselves in spontaneous surface relief gratings (SRG) under irradiation using a single polarized beam. Decreasing the temperature allows us to access and study very short time scales in the patterns formation mechanism.

Grain Enhancement of Thin Silicon Layers Using Optical Processing

1997 ◽  
Vol 470 ◽  
Author(s):  
B. L. Sopori ◽  
Jeff Alleman ◽  
W. Chen ◽  
T. Y. Tan ◽  
N. M. Ravindra
Keyword(s):  
Thin Films ◽  
Low Temperatures ◽  
Low Cost ◽  
Optical Processing ◽  
Glass Substrates ◽  
Coated Substrate ◽  
Grain Sizes ◽  
Fine Grain ◽  
A New Technique ◽  
Short Time

ABSTRACTWe describe a new technique for producing large-grain, poly-Si thin films on low-cost glass substrates for solar cell applications. A layer of fine-grain poly-Si is deposited on metal-coated substrate followed by a grain enhancement using optical/thermal annealing at low temperatures (∼ 500 °C). The results show that in thin-layer silicon, less than 3 microns, grains can be formed in a short time (few minutes) with grain sizes larger than the film thickness. The possible mechanisms involved in this process are also presented.

Properties of some azo-copolyimide thin films used in the formation of photoinduced surface relief gratings

RSC Advances ◽  
2015 ◽  
Vol 5 (14) ◽  
pp. 10125-10133 ◽  
Author(s):  
Ion Sava ◽  
Ada Burescu ◽  
Iuliana Stoica ◽  
Valentina Musteata ◽  
Mariana Cristea ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Relief ◽  
Free Standing ◽  
Surface Relief Gratings

The patterning of the free standing azo-copolyimide films under different irradiation conditions led to the uniform surface relief gratings.

Fabrication of Oriented TiO2-Based Nanotube Array Thin Films

2008 ◽  
Vol 135 ◽  
pp. 19-22
Author(s):  
Yu Peng Guo ◽  
Nam Hee Lee ◽  
Hyo Jin Oh ◽  
Cho Rong Yoon ◽  
Chang Kyu Rhee ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Hydrothermal Method ◽  
Formation Mechanism ◽  
Nanotube Array ◽  
Long Time ◽  
Vertically Aligned ◽  
Short Time

In this study, we have successfully developed the technology to grow the nanotube array thin films from dip-coated titania using hydrothermal method. The nanotube array thin film strongly adhered onto the substrate, was formed in short time reaction at 140°C. Even a self-supporting films, consisted of vertically aligned nanotube in large part, were formed after long time reactions at 140°C with 10 μm in thickness. The most probable formation mechanism of TiO2-based nanotube array thin films is discussed.

scholarly journals Tunable Polarization and Surface Relief Holographic Gratings in Azopolymer Nanocomposites with Incorporated Goethite (α-FeOOH) Nanorods

Photonics ◽  
2021 ◽  
Vol 8 (8) ◽  
pp. 306
Author(s):  
Lian Nedelchev ◽  
Georgi Mateev ◽  
Velichka Strijkova ◽  
Verónica Salgueiriño ◽  
David S. Schmool ◽  
...  
Keyword(s):  
Thin Films ◽  
Sample Preparation ◽  
Diffraction Efficiency ◽  
Sodium Salt ◽  
Surface Relief ◽  
Holographic Gratings ◽  
Surface Relief Grating ◽  
Nanocomposite Thin Films ◽  
Surface Relief Gratings

We employ two approaches to tune the properties of concurrently inscribed volume polarization and surface relief gratings in nanocomposite thin films containing the azopolymer PAZO (poly[1-4-(3-carboxy-4-hydrophenylazo)benzensulfonamido]-1,2-ethanediyl, sodium salt]) and goethite (α-FeOOH) nanorods. The first one is applied on the stage of sample preparation by varying the concentration of the goethite nanorods from 0% to 15%. Then, different angles between the recording beams are set in the holographic scheme, which allow us to obtain gratings with spatial periods in the range from 0.86 to 2.51 µm. Surface relief modulation close to 300 nm is achieved as well as total diffraction efficiency in the ±1 diffracted orders of more than 50%. The influence of the incorporated goethite nanorods on the properties of both volume birefringence and the surface relief grating are discussed.

scholarly journals Azobenzene molecular glasses with tuned glass transition temperatures: from optimal light-induced motion to self-erasable gratings

2020 ◽  
Vol 8 (18) ◽  
pp. 6203-6213
Author(s):  
Austin Diggins ◽  
Eoin Dawson ◽  
Mahnaz Kamaliardakani ◽  
Christian Pellerin ◽  
Ribal Georges Sabat ◽  
...  
Keyword(s):  
Thin Films ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Surface Relief ◽  
Transition Temperatures ◽  
Molecular Glasses ◽  
Glass Transition Temperatures ◽  
Induced Motion ◽  
Surface Relief Gratings

The rate of photomechanical formation of surface relief gratings (SRG) in thin films of azobenzene materials depends on their glass transition temperature (Tg), with self-erasable gratings being formed with materials with sub-ambient Tg.

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