Nonlinear optical and optical limiting response of PLD nc-Si thin films

2017 ◽  
Vol 5 (46) ◽  
pp. 12211-12220 ◽  
Author(s):  
Partha P. Dey ◽  
Alika Khare
Keyword(s):  
Thin Films ◽  
Deposition Temperature ◽  
Nonlinear Optical ◽  
Optical Limiting ◽  
Temperature Dependent ◽  
Limiting Behavior ◽  
Si Films

PLD nc-Si films exhibited deposition temperature-dependent large RSA and positive NLR (χ(3) ∼ 10−1 esu) and optical limiting behavior.

Photophysical and nonlinear optical study of benzothiazole substituted phthalocyanines in solution and thin films

2017 ◽  
Vol 21 (04-06) ◽  
pp. 263-272 ◽  
Author(s):  
Njemuwa Nwaji ◽  
Owolabi M. Bankole ◽  
Jonathan Britton ◽  
Tebello Nyokong
Keyword(s):  
Thin Films ◽  
Nonlinear Optical ◽  
Laser Excitation ◽  
Optical Limiting ◽  
Optical Study ◽  
Optical Performance ◽  
Third Order ◽  
Limiting Behavior ◽  
532 Nm ◽  
Order Susceptibility

In this study, the photophysical, nonlinear absorption and nonlinear optical limiting properties of zinc and gallium phthalocyanine complexes: tetrakis[(benzo[d]thiazol-2-yl phenoxy)phthalocyaninato]zinc(II) (3), tetrakis[(benzo[d]thiazol-2-yl phenoxy)phthalocyaninato] gallium(III) chloride (4), tetrakis[(benzo[d]thiazol-2-ylthio)phthalocyaninato] zinc(II) (5), tetrakis[(benzo[d]thiazol-2-ylthio)phthalocyaninato] gallium(III) chloride (6), were investigated both in solution and when embedded in polystyrene thin films using 532 nm laser excitation at 10 ns pulses. It was also observed that complexes that have higher triplet state absorption also possessed enhanced nonlinear and optical limiting behavior. Superior optical performance was observed when the complexes were embedded in thin films compared to when they are in solution. Complex 6 in thin films gave the highest imaginary third-order susceptibility (I[Formula: see text][X[Formula: see text]]) and hyperpolarizability ([Formula: see text] at 4.61 × 10[Formula: see text] esu and 3.44 × 10[Formula: see text] esu, respectively, with a low I[Formula: see text] value of 0.06 J.cm[Formula: see text]

scholarly journals Molecular Engineering of Nonplanar Porphyrin and Carbon Nanotube Assemblies: A Linear and Nonlinear Spectroscopic and Modeling Study

2011 ◽  
Vol 2011 ◽  
pp. 1-12 ◽  
Author(s):  
Éimhín M. Ní Mhuircheartaigh ◽  
Silvia Giordani ◽  
Donal MacKernan ◽  
Sharon M. King ◽  
David Rickard ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Molecular Conformation ◽  
Noncovalent Interactions ◽  
Optical Limiting ◽  
Convincing Evidence ◽  
Molecular Engineering ◽  
Photoluminescence Quenching ◽  
Limiting Behavior ◽  
Nanotube Composites ◽  
Linear And Nonlinear

The importance of molecular conformation to the nature and strength of noncovalent interactions existing between a series of increasingly nonplanar tetraphenylporphyrin (TPP) derivatives and carbon nanotubes was systematically investigated experimentally in solution using a range of linear and nonlinear optical techniques. Additional complementary molecular dynamics studies were found to support the experimental observations. Convincing evidence of binding between single walled nanotubes (SWNTs) and some of these porphyrins was discovered, and a nonplanar macrocycle conformation was found to increase the likelihood of noncovalent binding onto nanotubes. Nonlinear optical studies showed that the optical limiting behavior of the TPP derivatives deteriorated with increasing porphyrin nonplanarity, but that formation of nanotube composites dramatically improved the optical limiting properties of all molecules studied. It was also found that the significant photoluminescence quenching behavior reported in the literature for such porphyrin/SWNT composites is at least partly caused by photoluminescence and excitation self-absorption and is, therefore, an artifact of the system.

Optical limiting behavior of ring substituted zinc, indium and gallium phthalocyanines in the presence of quantum dots

2011 ◽  
Vol 15 (11n12) ◽  
pp. 1239-1249 ◽  
Author(s):  
Jonathan Britton ◽  
Christian Litwinski ◽  
Mahmut Durmuş ◽  
Vongani Chauke ◽  
Tebello Nyokong
Keyword(s):  
Thin Films ◽  
Quantum Dots ◽  
Optical Limiting ◽  
Amino Groups ◽  
Third Order ◽  
Limiting Behavior ◽  
General Improvement ◽  
Limiting Parameters ◽  
Future Work ◽  
Order Susceptibility

This paper presents the study of the effects of CdTe-TGA quantum dots (QDs) on optical limiting ability of different phthalocyanine (Pc) complexes (1–10) containing Zn , Ga , In central metals and substituted with benzyloxyphenoxy, phenoxy, tert-butylphenoxy and amino groups. The optical limiting parameters of Pcs were higher for tert-butylphenoxy when compared to benzyloxyphenoxy and phenoxy substituents, in DMSO. Non-peripheral substitution decreased the optical limiting parameters. Third-order susceptibility (Im[χ(3)]/α) values of Pcs in the absence and presence of CdTe QDs were in the 10-12 to 10-10 esu.cm range. Hyperpolarizabilities (γ) ranged from 10-31 to 10-29 esu L for Pc alone or in mixture with QDs. There is a general improvement in optical limiting ability of Pc complexes in the presence of CdTe TGA QDs. Due to these promising results, future work can be implemented for the creation of Pc:QD thin films, which would then be examined to ensure that their optical limiting ability is still acceptable.

Nanosecond nonlinear optical limiting properties of new trinuclear lanthanide phthalocyanines in solution and as thin films

Polyhedron ◽  
2015 ◽  
Vol 85 ◽  
pp. 347-354 ◽  
Author(s):  
Kutloano E. Sekhosana ◽  
Edith Amuhaya ◽  
Tebello Nyokong
Keyword(s):  
Thin Films ◽  
Nonlinear Optical ◽  
Optical Limiting

Effect of Deposition Condition of Precursor Amorphous Silicon Thin Films on the Behavior of Milc

2001 ◽  
Vol 685 ◽  
Author(s):  
Y.-G. Yoon ◽  
G.-B. Kim ◽  
H.-H Park ◽  
S.-W Lee ◽  
S.-K. Joo
Keyword(s):  
Thin Films ◽  
Vapor Deposition ◽  
Deposition Temperature ◽  
Structural Changes ◽  
Chemical Vapor ◽  
Deposition Condition ◽  
Micro Structure ◽  
Silicon Thin Films ◽  
Lower Temperature ◽  
Si Films

AbstractWe studied on the effect of a deposition condition of precursor a-Si thin films on the shape and micro-structure of MILC. The a-Si thin films were prepared by Plasma Enhanced Chemical Vapor Deposition (PECVD) with silane and hydrogen as a source gas and the deposition temperature was varied from 100 to 400∼. The a-Si films deposited at a lower temperature showed a tendency to (111) crystals and leaving some a-Si residues in MILC region, while those with higher deposition temperature tended to be crystallized to (110). These differences were explained in terms of original hydrogen content and following structural changes by the dehydrogenation during annealing.

Nonlinear optical and optical limiting properties of phthalocyanines in solution and thin films of PMMA at 633 nm studied using a cw laser

2007 ◽  
Vol 61 (22) ◽  
pp. 4426-4431 ◽  
Author(s):  
S.J. Mathews ◽  
S. Chaitanya Kumar ◽  
L. Giribabu ◽  
S. Venugopal Rao
Keyword(s):  
Thin Films ◽  
Nonlinear Optical ◽  
Optical Limiting ◽  
Cw Laser
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