Nonunear Absorption in Phthalocyanines and Naphthalocyanines

1993 ◽  
Vol 328 ◽  
Author(s):  
James S. Shirk ◽  
Steven R. Flom ◽  
J. R. Lindle ◽  
F. J. Bartoli ◽  
Arthur W. Snow ◽  
...  
Keyword(s):  
Ground State ◽  
Nonlinear Absorption ◽  
Optical Limiting ◽  
Wavelength Dependence ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Ground State Absorption

ABSTRACTThe wavelength dependence of the nonlinear absorption for lead tetrakis (cumyl-phenoxy) phthalocyanine (PbPc(CP)4) and lead octa (α-pentoxy) napthalocyanine (PbNc(α-PO)8) are reported. The ground state absorption and the reverse saturable absorption are substantially red shifted in PbNc (α-PO)8 as expected. Such control over the reverse saturable absorption is crucial to design optical limiting materials for specific wavelength ranges.

Increasing the triplet lifetime and extending the ground-state absorption of biscyclometalated Ir(iii) complexes for reverse saturable absorption and photodynamic therapy applications

2016 ◽  
Vol 45 (41) ◽  
pp. 16366-16378 ◽  
Author(s):  
Chengzhe Wang ◽  
Levi Lystrom ◽  
Huimin Yin ◽  
Marc Hetu ◽  
Svetlana Kilina ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Ground State ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Ground State Absorption ◽  
Saturable Absorbers ◽  
Triplet Lifetime

Tuning the photophysics of cationic Ir(iii) complexes via π-expansive ligands dramatically impacts their applications as broadband reverse saturable absorbers and in photodynamic therapy and theranostics.

PICOSECOND REVERSE SATURABLE ABSORPTION AND OPTICAL LIMITING IN FULLERENES AND THEIR METAL DERIVATIVES

2000 ◽  
Vol 09 (04) ◽  
pp. 505-521 ◽  
Author(s):  
J. CALLAGHAN ◽  
W. J. BLAU ◽  
F. Z. HENARI
Keyword(s):  
Excited State ◽  
Cross Sections ◽  
Ground State ◽  
Population Level ◽  
Optical Limiting ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Picosecond Pulses ◽  
Metal Derivatives ◽  
532 Nm

Investigations of the reverse saturable absorption behaviour of Fullerenes C 60 and C 70 and some of their Pt and Pd metal derivatives have been carried out with picosecond pulses at 532 nm. From intensity dependent transmission measurements, coupled with a population level kinetic analysis, excited state cross sections were determined for the materials. These show that C 60 possesses the largest excited state to ground state cross-section ratio and that, of the materials studied, it offers the best optical limiting ability around 532 nm. C 70, due to its large ground state absorption, has been shown not to be an efficient limiter. The metal derivatives perform better than C 70 but less efficiently than C 60.

OPTICAL LIMITING IN TeO2–ZnO GLASS FROM Z-SCAN TECHNIQUE

2011 ◽  
Vol 20 (03) ◽  
pp. 351-356 ◽  
Author(s):  
ROSE LEENA THOMAS ◽  
VASUJA ◽  
MISHA HARI ◽  
B. NITHYAJA ◽  
S. MATHEW ◽  
...  
Keyword(s):  
Optical Properties ◽  
Nonlinear Absorption ◽  
Optical Limiting ◽  
Nonlinear Material ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Absorption Coefficients ◽  
Single Beam ◽  
Optical Limiter

TeO 2– ZnO glasses were prepared by conventional melting procedure, and their optical properties were determined. In the present work, we measured the optical non-linearity of the glass. The measurement was carried out using a single beam z-scan technique given by Sheike Bahe et al. We could observe that the material exhibits reverse saturable absorption, and the effective nonlinear absorption coefficients are numerically evaluated. This study is important in identifying the nonlinear material as a Reverse Saturable Absorption (RSA) based optical limiter.

Strong reverse saturable absorption effect of a nonaggregated phthalocyanine-grafted MA–VA polymer

2018 ◽  
Vol 6 (36) ◽  
pp. 9767-9777 ◽  
Author(s):  
Jun Chen ◽  
Yong Xu ◽  
Mihong Cao ◽  
Yafei Wang ◽  
Tongxiang Liang ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Vinyl Acetate ◽  
Nonlinear Absorption ◽  
Optical Limiting ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Absorption Effect ◽  
Grafted Polymer ◽  
Optical Limiting Effect

The amino-substituted phthalocyanines (TA-PcInCl) with high optical limiting effect are grafted onto the copolymer matrix of maleic anhydride (MA) and vinyl acetate (VA), to obtain a novel phthalocyanine grafted polymer (MA–VA-PcInCl) with superior nonlinear absorption effect.

Optimization of Reverse Saturable Absorber Limiters: Material Requirements and Design Considerations

1994 ◽  
Vol 374 ◽  
Author(s):  
D. J. Hagan ◽  
T. Xia ◽  
A. Dogariu ◽  
A. A. Said ◽  
E. W. Van Stryland
Keyword(s):  
Nonlinear Absorption ◽  
Entire Length ◽  
Nonlinear Material ◽  
Propagation Path ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Individual Element ◽  
Analytic Model ◽  
Molecular Density ◽  
Optimized Distribution

AbstractWe present numerical beam-propagation simulations of optimized reverse-saturable absorption (RSA) based optical limiters where the depth of focus of the input beam is much smaller than the thickness of the nonlinear material. The optimization is achieved by allowing the molecular concentration to vary along the propagation path, allowing the entire length of the limiter to reach the maximum possible nonlinear absorption before eventual damage to the limiter. We review in detail the analytic model originally derived by Miles [1] to determine the design and performance of such limiters. This model requires the usual 5-level model used in the numerical solution to be approximated by a quasi-three-level system. We show that this effective 3-level excited-state cross section is both pulsewidth and fluence dependent. The numerical propagation output shows that there is considerable diffractive beam distortion, which cannot be accounted for in the analytic model. The end result is that while there is qualitative agreement with numerical results, the magnitude of the limited output can be an order-of-magnitude underestimated. We determine that the fluence level at all parts of the limiter must be at least ten times the saturation fluence to efficiently utilize the nonlinear absorption. We further describe how the optimized distribution of molecular density is the limit of the multi-element tandem limiter for an infinite number of elements. By carefully accounting for saturation over the entire length of each individual element, we show how a multi-element limiter may be designed to closely approach the performance of the optimized distribution for as few as four elements. With current materials technology the damage threshold of solid hosts needed to vary the molecular density is much lower than that of glass cuvettes used for liquid based limiters. Therefore, a multi-element liquid based tandem limiter can be used in full saturation so that better limiter performance should be obtained. Ultimately, however, the operation of all RSA-based limiters involves a strict trade-off between performance and linear transmittance.

Reverse saturable absorption and optical limiting in indanthrone dyes

1996 ◽  
Vol 62 (3) ◽  
pp. 293-297 ◽  
Author(s):  
Rama Chari ◽  
S. R. Mishra ◽  
H. S. Rawat ◽  
S. M. Oak
Keyword(s):  
Optical Limiting ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption

Nanosecond reverse saturable absorption and optical limiting in (Me_4N)_2[Cd(dmit)(Sph)_2]

2001 ◽  
Vol 18 (10) ◽  
pp. 1464 ◽  
Author(s):  
Zhenrong Sun ◽  
Minghong Tong ◽  
Heping Zeng ◽  
Liangen Ding ◽  
Zugeng Wang ◽  
...  
Keyword(s):  
Optical Limiting ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption

Phosphorescence Studies of Reverse Saturable Absorption Materials

1999 ◽  
Vol 597 ◽  
Author(s):  
E. S. Pooler ◽  
C. M. Clark ◽  
S. M. Kirkpatrick
Keyword(s):  
Energy Level ◽  
Triplet State ◽  
Ground State ◽  
Relative Energy ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Absorption And Emission ◽  
Host Polymer

AbstractPhosphorescence studies of reverse saturable absorption materials (RSA) are discussed. Absorption and emission measurements of an RSA material, specifically Zinc 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetraphenylporphyrin (ZnOBP), are performed in a proprietary host polymer. Spectra are analyzed to estimate the relative energy level of the first triplet state of ZnOBP with respect to the ground state.

Nonlinear absorption in tetrathia[22]porphyrin(2.1.2.1)s: visualizing strong reverse saturable absorption at non-resonant excitation

RSC Advances ◽  
2016 ◽  
Vol 6 (27) ◽  
pp. 22659-22663 ◽  
Author(s):  
Kamaljit Singh ◽  
Shafali Arora ◽  
Krishnandu Makhal ◽  
Paramjit Kaur ◽  
Debabrata Goswami
Keyword(s):  
Nonlinear Absorption ◽  
Potential Application ◽  
Optically Active ◽  
Resonant Excitation ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Threshold Values ◽  
Optical Limiters ◽  
The Family ◽  
New Entry

meso-Substituted neutral, aromatic tetrathia[22]porphyrin(2.1.2.1)s represent a new entry in the family of nonlinear optically active porphyrins. The low fluence threshold values of these porphyrins endorse potential application as optical limiters.

Nonlinear Absorption Properties of Spherical Gold Colloidal Nanoparticles

2012 ◽  
Vol 476-478 ◽  
pp. 923-927 ◽  
Author(s):  
Chan Zheng ◽  
Xiao Yun Ye ◽  
Xue Qing Xiao
Keyword(s):  
Nonlinear Absorption ◽  
Laser Pulses ◽  
Phase Method ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Colloidal Nanoparticles ◽  
Free Carrier Absorption ◽  
Absorption Properties ◽  
Liquid Phase Method ◽  
Carrier Absorption

Spherical gold colloidal nanoparticles were prepared used traditional liquid phase method and the corresponding nonlinear absorption properties were investigated by open aperture Z-scan technique using 8 ns laser pulses of 532 nm. The gold colloidal nanoparticles exhibited a transform from saturable absorption (SA) to reverse saturable absorption (RSA) at relatively higher irradiation intensities. The SA behavior presumably owes to the bleach of ground-state surface plasmon resonance (SPR) absorption, while the RSA might result from high excited-stated free carrier absorption.

Sign in / Sign up

Export Citation Format

Share Document