Design and Synthesis of New Acceptor Molecules for Photo-Induced Electron Transfer Reverse Saturable Absorption

1999 ◽  
Vol 598 ◽  
Author(s):  
M. Bader ◽  
J. Moser ◽  
H. Li ◽  
S. Tarter ◽  
C. Spangler
Keyword(s):  
Cross Sections ◽  
Excited State Absorption ◽  
Optical Power ◽  
Laser Frequency ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Incident Wavelength ◽  
Limiting Behavior ◽  
Design And Synthesis ◽  
Laser Systems

ABSTRACTWith the advent of efficient and relatively inexpensive pulsed and CW laser systems for both civilian and military applications, the need for adequate eye and sensor protection is becoming increasingly important. While it is possible to filter out harmful wavelengths if the laser frequency is known, the proliferation of frequency agile laser sources underscores the need for “smart” passive materials that can sense the incident wavelength and provide protection. There has been considerable progress made in recent years in the design of optical power limiting (OPL) materials that can function by a variety of mechanisms, most of which derive their limiting behavior from some type of nonlinear absorption process. The most well-studied of these processes involve excited state absorption in which the absorption cross-sections of the photo-generated transient species are much greater than the original S0 to S1 transition. In this presentation we will discuss the efficacy of charge transfer species for optical limiting, and the need for more and better electron acceptor species.

Design, Synthesis and Characterization of New Bimechanistic Optical Power Limiters Based on Reverse Saturable and Two-photon Absorption

1999 ◽  
Vol 597 ◽  
Author(s):  
C. W. Spangler ◽  
E. H. Elandaloussi ◽  
B. Ozer ◽  
K. Ashworth ◽  
L. Madrigal ◽  
...  
Keyword(s):  
Cross Sections ◽  
Excited State Absorption ◽  
Optical Power ◽  
Radical Cations ◽  
Optical Limiting ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Two Photon Absorption ◽  
Two Photon

AbstractDuring the past five years there has been considerable progress in the design of organic materials for optical power limiting (OPL) applications. One of the more promising and widely studied material approaches involves reverse saturable absorption (RSA) from various excited states. We have recently been examining the efficacy of utilizing highly absorbing photogenerated charge states for RSA. Both polaronic radical cations and bipolaronic dications are possible candidates for this mode of optical limiting. Equally intriguing are new approaches to designing chromophores with large two-photon absorption (TPA) cross-sections. For some pulse durations the effective two-photon cross-section for bis-(diphenylamino)diphenylpolyenes, and dendrimers based on these repeat units, are extraordinaryly large, indicative of excited state absorption. In this presentation we will discuss the possibility of combining these two optical limiting mechanistic paradigms in single structures, which may then be considered as bimechanistic optical power limiters.

scholarly journals Tunneling-induced optical limiting in quantum dot molecules

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Mohadeseh Veisi ◽  
Seyedeh Hamideh Kazemi ◽  
Mohammad Mahmoudi
Keyword(s):  
Quantum Dot ◽  
Optical Power ◽  
Optical Limiting ◽  
Input Voltage ◽  
Optical Nonlinearity ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Absorption Mechanism ◽  
Probe Field ◽  
Limiting Behavior

Abstract We present a convenient way to obtain an optical power limiting behavior in a quantum dot molecule system, induced by an interdot tunneling. Also, the effect of system parameters on the limiting performance is investigated; interestingly, the tunneling rate can affect the limiting performance of the system so that the threshold of the limiting behavior can be a function of the input voltage, allowing the optimization of the limiting action. Furthermore, by investigating the absorption of the probe field, it is demonstrated that the optical limiting is due to a reverse saturable absorption mechanism; indeed, analytical results show that this mechanism is based on a cross-Kerr optical nonlinearity induced by the tunneling. Additionally, the limiting properties of the system are studied by using a Z-scan technique.

Nonlinear Optical Properties of Modified Carbocyanines

1997 ◽  
Vol 479 ◽  
Author(s):  
Nansheng Tang ◽  
Weijie Su ◽  
Thomas M. Cooper ◽  
Daniel G. McLean ◽  
Donna M. Brandelik ◽  
...  
Keyword(s):  
Cross Sections ◽  
Excited State Absorption ◽  
Laser Pulses ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Pump Probe ◽  
Chirped Pulses ◽  
Molecular Hyperpolarizability ◽  
Meso Position ◽  
532 Nm

AbstractWe studied the optical nonlinearities of modified 3,3′-diethylthiadicarbocyanine iodides (X-DTDCI) in dimethyl sulfoxide (DMSO) solutions (X = H, Cl, Br at meso position) by a pump-probe technique with crossed polarized chirped laser pulses at room temperature. Reverse-saturable-absorption (RSA) with monoexponential lifetimes is observed at 532 nm in all the samples studied. We determined the effective excited-state absorption cross-sections and their lifetimes for all the samples investigated and found that they clearly correlate to the substituent X at the meso position. Empowered by the chirped pulses, a much faster nonlinearity with a decay time of ˜3.1 ps that is much shorter than the laser pulses used, is unveiled in Cl-DTDCI. We expressed both the absorptive and the refractive part of this fast nonlinearity as the equivalent molecular hyperpolarizability γ1212 and found γ1212 = (8.1 + i9.8) × 10−32erg−1.

NONLINEAR OPTICAL RESPONSE AND REVERSE SATURABLE ABSORPTION OF RARE EARTH PHTHALOCYANINE IN DMF SOLUTION

2003 ◽  
Vol 12 (03) ◽  
pp. 367-376 ◽  
Author(s):  
G. A. KUMAR
Keyword(s):  
Rare Earth ◽  
Excited State ◽  
Cross Sections ◽  
Nonlinear Optical ◽  
Excited State Absorption ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Absorption Cross

Nonlinear optical response and reverse saturable absorption behavior of various rare earth phthalocyanines such as Nd , Eu , Sm and La in dimethyl formamide (DMF) solution were studied under high power Nd:YAG laser excitation. Excited state absorption cross-sections and two-photon absorption cross-sections of these systems are measured from the limiting characteristics. The SmHPc 2 system yields maximum value for excited state absorption cross-section and its potential application in DMF as a suitable optical limiter is also discussed.

THIRD-ORDER NONLINEARITIES AND OPTICAL LIMITING OF C60 POLYURETHANE–UREA FILMS

2004 ◽  
Vol 13 (01) ◽  
pp. 45-54 ◽  
Author(s):  
SHENG-LI GUO ◽  
BING GU ◽  
TAO ZHANG
Keyword(s):  
Excited State Absorption ◽  
Optical Limiting ◽  
Homogeneous Material ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Third Order ◽  
Limiting Behavior ◽  
Nonlinear Optical Absorption ◽  
The Difference ◽  
532 Nm

We report on the measurement of the nonlinear optical absorption and refraction coefficients of C60-containing polyurethane–urea films on a nanosecond scale at a 532-nm wavelength, using the Z-scan technique. The optical limiting properties were also observed. The results show that the C60 polyurethane–urea is a kind of homogeneous material with a range of C60 content. With the difference in C60 content in polymers, the optical limiting properties are many and the required transmittance and transmitted energy can be altered depending on the C60 content in polymers. We suggest that the third-order nonlinearities and optical limiting behavior are consistent with excited-state absorption (reverse saturable absorption) as a mechanism.

Effects of extending the π-conjugation of the acetylide ligand on the photophysics and reverse saturable absorption of Pt(ii) bipyridine bisacetylide complexes

2016 ◽  
Vol 18 (41) ◽  
pp. 28674-28687 ◽  
Author(s):  
Taotao Lu ◽  
Chengzhe Wang ◽  
Levi Lystrom ◽  
Chengkui Pei ◽  
Svetlana Kilina ◽  
...  
Keyword(s):  
Excited State ◽  
Excited States ◽  
Substituent Effect ◽  
Excited State Absorption ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Triplet Excited State ◽  
Near Ir ◽  
Terminal Substituent ◽  
Acetylide Ligand

Extending the acetylide ligand π-conjugation diminishes the terminal substituent effect on the lowest excited states, but expands the triplet excited-state absorption to the near-IR region.

Photophysics and reverse saturable absorption of cationic dinuclear iridium(iii) complexes bearing fluorenyl-tethered 2-(quinolin-2-yl)quinoxaline ligands

2021 ◽  
Author(s):  
Cuifen Lu ◽  
Taotao Lu ◽  
Peng Cui ◽  
Svetlana Kilina ◽  
Wenfang Sun
Keyword(s):  
Excited State ◽  
Excited State Absorption ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Triplet Excited State ◽  
532 Nm

Dinuclear Ir(iii) complexes tethered by fluorenyl motif exhibited weak 1,3MLCT/1,3LLCT absorption at >500 nm, dual phosphorescence, broad triplet excited-state absorption, and reverse saturable absorption at 532 nm.

Dynamic saturable optical nonlinearities in free base tetrapyridylporphyrin

2003 ◽  
Vol 07 (06) ◽  
pp. 452-456 ◽  
Author(s):  
Newton M. Barbosa Neto ◽  
Leonardo De Boni ◽  
José J. Rodrigues ◽  
Lino Misoguti ◽  
Cléber R. Mendonça ◽  
...  
Keyword(s):  
Excited States ◽  
Cross Sections ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Optical Nonlinearities ◽  
Free Base ◽  
Photophysical Parameters ◽  
Crossing Time ◽  
532 Nm

Dynamic optical nonlinearities in free base tetrapyridylporphyrin ( H 2 TPyP ) solutions were investigated at 532 nm with the Z-scan technique. We observed a reverse saturable absorption process that was found to have a fast contribution related to the singlet population and a slow accumulative contribution arising from the triplet population. The optical excitations and subsequent relaxations can be interpreted with a five-energy-level diagram that allows determination of the excited states photophysical parameters such as triplet and singlet absorption cross-sections and the intersystem crossing time.

Extending the Bandwidth of Reverse Saturable Absorption in Platinum Complexes Using Two-Photon-Initiated Excited-State Absorption

2013 ◽  
Vol 5 (3) ◽  
pp. 565-572 ◽  
Author(s):  
Bingguang Zhang ◽  
Yunjing Li ◽  
Rui Liu ◽  
Timothy M. Pritchett ◽  
Joy E. Haley ◽  
...  
Keyword(s):  
Excited State ◽  
Excited State Absorption ◽  
Platinum Complexes ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Two Photon
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