Organic materials for optical limiting

Mishra, S. R.; Mehendale, S. C.

doi:10.1016/b978-012513745-4/50079-2

Cited by 8 publications

(6 citation statements)

References 96 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under nanosecond pulses, provided that ISC is fast and efficient, absorption arising from S 1 is often ignored. Usually populations of higher excited states can be neglected since their lifetimes are very short (picoseconds or less) …”

Section: Introductionmentioning

confidence: 99%

Modeling of Nonlinear Absorption of 5,10-A₂B₂Porphyrins in the Nanosecond Regime

et al. 2012

View full text Add to dashboard Cite

The nonlinear absorption (NLA) properties of free base and metalated porphyrins with a unique 5,10-A(2)B(2) substitution pattern were studied with open Z-scan technique at 532 nm in the nanosecond regime over a broad range of input fluence. The NLA responses were found to be dependent on structural features and the solvent used. In most cases, the character of the response differed from that typically observed for other porphyrins under similar experimental conditions (i.e., reverse saturable absorption, RSA), suggesting distinct photophysical properties. A series of models was considered in order to understand the NLA responses. Although the character of the responses varied between compounds and solvents, it was found that one model fits best all of the recorded responses. Thus, a four-level model with simultaneous two-photon absorption arising from the higher excited state is proposed (1 + 1 + 2 photon absorption).

show abstract

Section: Introductionmentioning

confidence: 99%

Modeling of Nonlinear Absorption of 5,10-A₂B₂Porphyrins in the Nanosecond Regime

et al. 2012

View full text Add to dashboard Cite

show abstract

“…These rely on the optical absorption properties of species that allow light at low intensities to pass essentially unobstructed, while higher intensities are attenuated much more strongly. Although a number of organic dye molecules show acceptable optical limiting properties in solution, − solid-state systems tend to be more suitable for technological applications. It is therefore desirable to disperse the dye species in a transparent host material.…”

Section: Introductionmentioning

confidence: 99%

“…The large delocalized conjugate π-electron systems of macrocyclic porphyrins often exhibit significant nonlinear optical responses, which impart good optical limiting properties. Optical limiting in porphyrins is typically the result of reverse saturable absorption, which may occur if the excited state absorption cross-section of the dye species is higher than that of its ground state. For such systems, at low light intensities, absorption occurs almost exclusively from the weakly absorbing ground state, and light is transmitted with little loss.…”

Section: Introductionmentioning

confidence: 99%

Mesostructured Silica/Block Copolymer Composites as Hosts for Optically Limiting Tetraphenylporphyrin Dye Molecules

et al. 2004

View full text Add to dashboard Cite

Transparent silica-block copolymer composites have been used as host matrices for optically limiting dye molecules to increase dye solubility and photophysical stability. For a given concentration, tetraphenylporphyrin (TPP)-doped mesostructured EO106PO70EO106−silica composites exhibited improved optical limiting properties compared to wholely inorganic TPP-doped silica hosts. Increased TPP solubility within the PPO−PEO block copolymer allows higher concentrations of TPP to be incorporated without dye aggregation, enhancing optical absorption of incident laser light. In addition, the silica framework provides increased damage resistance to a series of intense laser pulses compared to wholely organic host matrices.

show abstract

“…This might be due to the presence of the closed shell metal zinc in the central cavity which renders this compound more promising in comparison to others of similar structure. Closed shell metals were reported to have favourable effect on the NLA as they produce an increase in the intersystem crossing rate resulting in higher quantum yield for the triplet state [3][4][5]10]. Reports indicate brominated porphyrins as very promising materials for optical limiting applications [24,25].…”

Section: Monomersmentioning

confidence: 99%

“…Moreover, the design potential of these materials offers a unique opportunity for fine tuning the linear and NLO properties and thus of the optical limiting efficiency of porphyrin based compounds [6][7][8][9]. While general relationships between porphyrin structure and optical limiting properties have been established, these correlations are not fully understood yet and the design of efficient power limiters is still undergoing intensive investigation [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Correlation studies on structurally diverse porphyrin monomers, dimers and trimers and their nonlinear optical responses

Zawadzka

Wang

Blau

et al. 2009

Chemical Physics Letters

View full text Add to dashboard Cite

GRAPHICAL ABSTRACT Pictogram SynopsisThe nonlinear optical absorption of porphyrins can be modulated via chemical modifications of the ring system and the regiochemical arrangement of the substituents. ACCEPTED MANUSCRIPT ABSTRACTAn investigation of the nonlinear absorption of a wide range of structurally diverse porphyrin monomers, bisporphyrins and trisporphyrins, using open Z-scan technique with 6 ns pulsed laser operating at 532 nm was carried out. Using the theory of reverse saturable absorption, the intensity dependent nonlinear absorption coefficient eff was deduced from the experiments. Monomers which Soret band maximum was situated closer to the experimental wavelength had higher eff . The eff of dimers and trimers were in the same range as for monomers. The highest eff = 5.3 10 -8 cmW -1 was found for a zinc complex of 5,15-A 2 B 2 type porphyrins with 3-methoxyphenyl and trimethylsilyl-ethynyl groups in the meso positions.

show abstract

Organic materials for optical limiting

Cited by 8 publications

References 96 publications

Modeling of Nonlinear Absorption of 5,10-A₂B₂Porphyrins in the Nanosecond Regime

Modeling of Nonlinear Absorption of 5,10-A₂B₂Porphyrins in the Nanosecond Regime

Mesostructured Silica/Block Copolymer Composites as Hosts for Optically Limiting Tetraphenylporphyrin Dye Molecules

Correlation studies on structurally diverse porphyrin monomers, dimers and trimers and their nonlinear optical responses

Contact Info

Product

Resources

About

Organic materials for optical limiting

Cited by 8 publications

References 96 publications

Modeling of Nonlinear Absorption of 5,10-A2B2Porphyrins in the Nanosecond Regime

Modeling of Nonlinear Absorption of 5,10-A2B2Porphyrins in the Nanosecond Regime

Mesostructured Silica/Block Copolymer Composites as Hosts for Optically Limiting Tetraphenylporphyrin Dye Molecules

Correlation studies on structurally diverse porphyrin monomers, dimers and trimers and their nonlinear optical responses

Contact Info

Product

Resources

About

Modeling of Nonlinear Absorption of 5,10-A₂B₂Porphyrins in the Nanosecond Regime

Modeling of Nonlinear Absorption of 5,10-A₂B₂Porphyrins in the Nanosecond Regime