scholarly journals Formation of Direct Surface Relief in Photochrome-Chalcogenide Composites

2010 ◽  
Vol 47 (2) ◽  
pp. 49-59
Author(s):  
A. Gerbreders ◽  
J. Teteris
Keyword(s):  
Surface Relief ◽  
Composite Films ◽  
Film Surface ◽  
Organic Polymer ◽  
Holographic Recording ◽  
Relief Formation ◽  
Induced Changes ◽  
Quartz Substrates ◽  
532 Nm ◽  
Transmission And Reflection

Formation of Direct Surface Relief in Photochrome-Chalcogenide CompositesA method for preparation of thin triple composite films of organic polymer-chalcogenide-photochromes is described, the photo-induced changes of optical properties and holographic recording are considered. The films were obtained from solutions of arsenic sulphide, azobenzene Disperse Red 1, spiropyran, and organic polymers in organic solvents. The solutions were spread over glass or quartz substrates; the thickness of dry films was 3-10 μm. The absorption spectra of the prepared films were studied and analyzed. The holographic recording of diffraction gratings was performed by laser lines of 325 nm, 442 nm and 532 nm. During recording the diffraction efficiency was measured simultaneously in the transmission and reflection modes. The relief formation on the film surface was observed and the profile of the gratings formed was analyzed using AFM microscope. The influence of photoisomerization and photo-induced mass transport on the surface relief formation process is discussed.

Direct surface relief pattering of azo-polymers films via holographic recording

2014 ◽  
Vol 92 (7/8) ◽  
pp. 842-844 ◽  
Author(s):  
Jelena Aleksejeva ◽  
Mara Reinfelde ◽  
Janis Teteris
Keyword(s):  
Data Storage ◽  
Surface Relief ◽  
Polarization State ◽  
Holographic Recording ◽  
Polymeric Chain ◽  
Electric Field Direction ◽  
Direct Formation ◽  
Disperse Red 1 ◽  
Surface Relief Gratings ◽  
532 Nm

In this work surface relief direct formation during holographic recording in poly (Disperse Red 1 – methacrylate) films was studied. In this material azo-dye Disperse Red 1 is covalently attached to the main polymeric chain making lateral mass transport in the film caused by a presence of light electric field direction modulation very fast and effective. Surface relief grating formation process was induced by 532 nm laser. Read-out was performed by 660 nm diode laser. Diffraction efficiencies kinetics dependence on polarization state of reading and recording beams was studied. Surface relief depth on the films was measured by AFM. Deep surface relief gratings were obtained in Poly (Disperse Red 1 – methacrylate). Films relief can exceed the initial thickness of the sample more than three times. Fabrication of such surface relief gratings is fast and easy. They can find their application in data storage, electro-optical devices, telecommunication.

Surface Relief Formation in Photo-Cross-Linkable Polymer/Benzophenone Composite Films Using 325 nm Laser

2010 ◽  
Vol 49 (8) ◽  
pp. 080207 ◽  
Author(s):  
Nobuhiro Kawatsuki ◽  
Mizuho Kondo ◽  
Makoto Okada ◽  
Shinji Matsui ◽  
Hiroshi Ono ◽  
...  
Keyword(s):  
Surface Relief ◽  
Composite Films ◽  
Relief Formation

Photoinduced Anisotropy of IWK-2D Azobenzene Molecular Glassy Films

2018 ◽  
Vol 762 ◽  
pp. 233-238
Author(s):  
Andris Ozols ◽  
Edvins Letko ◽  
Peteris Augustovs ◽  
Dmitry Saharov ◽  
Elmars Zarins ◽  
...  
Keyword(s):  
Surface Relief ◽  
Surface Profile ◽  
Holographic Recording ◽  
Holographic Gratings ◽  
Polarized Beams ◽  
Atomic Force ◽  
Photoinduced Anisotropy ◽  
Polarization Gratings ◽  
Profile Changes ◽  
Transmission And Reflection

We have experimentally studied photoinduced anisotropy (PA) of holographic gratings in IWK-2D [precise chemical notation: 2-(3-(4-((4-(bis (2-(trityloxy) ethyl) amino) phenyl) diazenyl) styryl)-5,5-dimethylcyclohex-2-enylidene) malononitrile] azobenzene molecular glassy films in transmission and reflection modes using a special simultaneous holographic recording and readout setups which enabled measurements of PA time evolution. PA manifested itself by diffraction efficiency difference with linear s- and p-polarizations. Three different types of polarization holographic gratings were recorded and studied using p-p, L-L and L-R polarized beams creating different recording interference patterns. Atomic force microscope (AFM) was used to study the surface profile changes. Experimental evidence was obtained that the transmission mode PA was due to the both recorded surface relief and volume polarization gratings whereas the reflection mode PA was due to the recorded surface relief gratings. The main PA features were similar for all three types of polarization gratings whereas details were different. PA properties of IWK-2D films were notably distinctive from those of previously studied films.

scholarly journals All-Optical Surface Micropatterning by Electric Field Intensity Gradient

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
U. Gertners ◽  
J. Teteris
Keyword(s):  
Electric Field ◽  
Field Intensity ◽  
Surface Relief ◽  
Electric Field Intensity ◽  
Mass Transfer Process ◽  
Holographic Recording ◽  
Intensity Gradient ◽  
Direct Patterning ◽  
All Optical ◽  
532 Nm

In this report an all-optical photo-induced formation of surface relief gratings is shown. For the surface patterning of As2S3 and As4S1.5Se4.5 films a direct holographic recording setup with a 532 nm wavelength Nd:YAG CW laser light was used. Our investigations have shown that the light-induced mass transfer process strongly depends on the material itself and on the polarization of the light. It has been shown that an electric field intensity gradient has to be obtained to achieve a direct patterning. The evolution of a surface relief in relation to recording parameters and thickness of the sample has been investigated in detail.

scholarly journals Ammonia Gas Sensing Characteristic of P3HT-rGO-MWCNT Composite Films

2021 ◽  
Vol 11 (15) ◽  
pp. 6675
Author(s):  
Tran Si Trong Khanh ◽  
Tran Quang Trung ◽  
Le Thuy Thanh Giang ◽  
Tran Quang Nguyen ◽  
Nguyen Dinh Lam ◽  
...  
Keyword(s):  
Response Time ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Composite Films ◽  
Weight Ratio ◽  
Film Surface ◽  
Relative Sensitivity ◽  
Ammonia Gas ◽  
Casting Technique ◽  
Multi Walled Carbon Nanotubes

In this work, the P3HT:rGO:MWCNTs (PGC) nanocomposite film applied to the ammonia gas sensor was successfully fabricated by a drop-casting technique. The results demonstrated that the optimum weight ratio of the PGC nanocomposite gas sensor is 20%:60%:20% as the weight ratio of P3HT:rGO:MWCNTs (called PGC-60). This weight ratio leads to the formation of nanostructured composites, causing the efficient adsorption/desorption of ammonia gas in/out of the film surface. The sensor based on PGC-60 possessed a response time of 30 s, sensitivity up to 3.6% at ammonia gas concentration of 10 ppm, and relative sensitivity of 0.031%/ppm. These results could be attributed to excellent electron transportation of rGO, the main adsorption activator to NH3 gas of P3HT, and holes move from P3HT to the cathodes, which works as charge “nano-bridges” carriers of Multi-Walled Carbon Nanotubes (MWCNTs). In general, these three components of PGC sensors have significantly contributed to the improvement of both the sensitivity and response time in the NH3 gas sensor.

Soft Crosslinkable Azo Polymer for Rapid Surface Relief Formation and Persistent Fixation

2001 ◽  
Vol 13 (22) ◽  
pp. 1693-1697 ◽  
Author(s):  
N. Zettsu ◽  
T. Ubukata ◽  
T. Seki ◽  
K. Ichimura
Keyword(s):  
Surface Relief ◽  
Azo Polymer ◽  
Relief Formation

Complex Structures of Surface Relief Induced by Holographic Recording in Azo-Dye-Doped Elastomer Thin Films

2003 ◽  
Vol 36 (15) ◽  
pp. 5689-5693 ◽  
Author(s):  
Federica Ciuchi ◽  
Alfredo Mazzulla ◽  
Giovanni Carbone ◽  
Gabriella Cipparrone
Keyword(s):  
Thin Films ◽  
Azo Dye ◽  
Surface Relief ◽  
Holographic Recording ◽  
Complex Structures

Large Cubic Nonlinear Optical Properties of Organic Semiconductor Superlattices

1989 ◽  
Vol 173 ◽  
Author(s):  
Samson A. Jenekhe ◽  
Wen-Chang Chen ◽  
Saukwan Lo ◽  
Steven R. Flom
Keyword(s):  
Four Wave Mixing ◽  
Organic Polymer ◽  
Wave Mixing ◽  
Optical Nonlinearities ◽  
Large Magnitude ◽  
Semiconductor Superlattices ◽  
Polymer Semiconductor ◽  
Device Applications ◽  
Further Development ◽  
532 Nm

ABSTRACTWe have measured extremely large second hyperpolarizabilities〈γxxxx〉 in solutions of two recently prepared organic polymer semiconductor superlattices. These block copolymers are of alternating aromatic and quinoidal moieties and structurally differ by a side group substituent. The values observed are 1.6 × 10−29 esu for the parent copolymer (PBTBQ) and 3.7 × 10−30 esu for its acetoxy derivative (PBTABQ). The corresponding values of χ(3) are estimated to be 2.7 × 10−7 esu and 4.5 × 108 esu. The measurements, made by picosecond degenerate four wave mixing at 532 nm, showed that the dynamics of the larger χ(3) valued copolymer were faster than the 30 ps resolution of the instrument while the derivative exhibited a slower response. The large magnitude and rapid response of the cubic optical nonlinearities in these novel materials suggest theiT potential for further development and photonic device applications.

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