Linear and nonlinear optical studies of poly(p-phenylene vinylene) derivatives and polydiacetylene-4BCMU

McBranch, D.; Sinclair, Michael B.; Heeger, A.J.; Patil, Abhimanyu O.; Shi, Sun; Askari, Syed; Wudl, Fred

doi:10.1016/0379-6779(89)90280-4

Cited by 37 publications

(7 citation statements)

References 4 publications

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“…This is a crucial factor in attaining high optical nonlinearities, and, indeed, PPV and its derivatives have been considered for applications in which a high value of the nonlinear refractive index, n 2 would be of advantage to obtain all-optical switching of optical signals at relatively low light intensities [6]. Numerous studies reported the values of the third-order susceptibility of PPV for a degenerate process χ (3) (ω;ω,−ω,ω) reaching 10 -9 esu (about 10 -17 m 2 /V 2 ) [7][8][9], with the third-harmonic generation related χ (3) (3ω;ω,ω,ω) usually quoted [10][11][12][13] as being in the range of 10 -11 -10 -10 esu (about 10 -19 -10 -18 m 2 /V 2 ). With these high nonlinearities one can expect that even thin films may produce strong third-order nonlinear optical effects.…”

Section: Introductionmentioning

confidence: 99%

Third harmonic autocorrelation and wave mixing in a thin film of poly(p-phenylenevinylene)

Samoć¹,

Samoc̀²,

Luther‐Davies³

2003

Opt. Express

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We show here that a thin film of a nonlinear conjugated polymer: poly(p-phenylenevinylene) (PPV) is capable of efficiently generating the third harmonic of femtosecond pulses of light at the near infrared (including telecommunication bands) wavelengths, giving coherent, low divergence beams in the visible range. By using more than one fundamental beam overlapping in space and in time on the PPV film, autocorrelation signals are observed as well as higher order mixing signals due to X(5) and higherorder nonlinear susceptibilities. These signals can be used for applications such as short laser pulse diagnostics and photonic signal processing and they provide information about the nonlinear properties of the material itself.

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Section: Introductionmentioning

confidence: 99%

Third harmonic autocorrelation and wave mixing in a thin film of poly(p-phenylenevinylene)

Samoć¹,

Samoc̀²,

Luther‐Davies³

2003

Opt. Express

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“…In the field of new materials, π-electron-conjugated polymers have attracted considerable attention during the past 20 years, because they show electrical conductivities when chemically doped with electron donors or acceptors or when excited by light with energy larger than their band gap. − Poly( p -phenylenevinylene) (Figure a, abbreviated as PPV) is a π-electron-conjugated polymer with a nondegenerate ground state, which shows nonlinear optical properties, − photoconductivities, − electroluminescence, and high electrical conductivities upon doping. − The electrical conductivity of a highly stretched film of PPV has been reported to become as high as 1.12 × 10 4 S cm -1 by treating the film with concentrated sulfuric acid 1 (a) Repeating unit of poly( p -phenylenevinylene) (PPV) and (b) 1,4-bis(4-methylstyryl)benzene (PV2). …”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Studies on the Radical-Cation Dimer of a Model Compound of Poly(p-phenylenevinylene). Similarities between the Dimer and the State of Positive Polarons in the Sulfuric-Acid-Treated Polymer

1997

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Reversible dimerization of the radical cations of a model compound [CH3(C6H4CHCH)2C6H4CH3] of poly(p-phenylenevinylene) (PPV) in dichloromethane solution has been studied by electronic absorption, electron spin resonance, and resonance Raman spectroscopy. The electronic absorption spectrum of the radical-cation monomer drastically changes upon dimerization; the absorption maxima of the monomer are located at 636 and 1200 nm (15 700 and 8330 cm-1) and those of the dimer at 527 and 981 nm (19 000 and 10 200 cm-1). The monomer−dimer equilibrium constants (K's) at various temperatures have been determined from the observed temperature dependence of the electronic absorption spectra. From the van't Hoff plot of ln K against 1/T, the heat of dimerization ΔH has been evaluated to be −12.6 kcal mol-1. Electron spin resonance measurements have shown that the unpaired spins of the radical-cation monomers make a pair in the dimer. Such a radical-cation dimer is a good model of interchain interaction between polarons that are created on neighboring chains of PPV. The resonance Raman spectra of sulfuric-acid-treated PPV have been analyzed on the basis of the spectra of the radical-cation monomer and dimer. Sulfuric-acid-treated PPV is considered to contain positive polarons that interact with other polarons, in addition to positive polarons without such interaction.

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“…9 PDA has also been of sustained interest as a nonlinear optical material. 17,18 More recently, PDA has been incorporated into a variety of multilayed materials using self-assembly techniques. [19][20][21] To ascertain the optical constants of poly(1,6-bis-(nictonyloxy)-2,4-hexadiyne), we have measured the polarized optical reflectance of the cocrystal sample as a function of temperature.…”

Section: Introductionmentioning

confidence: 99%

“…The temperature-dependent spectra for PTS show a pronounced splitting of the electronic and vibronic bands at 5 K attributed to a second-order phase transition (∼190 K) with a doubling of the unit cell along the parallel chain direction . PDA has also been of sustained interest as a nonlinear optical material. , More recently, PDA has been incorporated into a variety of multilayed materials using self-assembly techniques. − …”

Section: Introductionmentioning

confidence: 99%

Optical Properties of a Supramolecular Assembly Containing Polydiacetylene

1999

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We report polarized optical measurements of a new type of single-crystal supramolecular assembly containing isolated chains of polydiacetylene (PDA): poly(1,6-bis(nictonyloxy)-2,4-hexadiyne). Room-temperature spectra reveal a large anisotropy, confirming the low-dimensional nature of the material. In particular, the characteristic optical signature of PDA correlates well with the chain orientation from the X-ray crystal structure. A near-infrared charge-transfer band is also observed, which we attribute to low-energy charge transfer from the polymer backbone to the pyridine rings. Temperature-dependent spectra reveal a weak doublet splitting of the optical bands, indicating a slight distortion of the side chains which contain the pyridine ring at low temperature.

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Linear and nonlinear optical studies of poly(p-phenylene vinylene) derivatives and polydiacetylene-4BCMU

Cited by 37 publications

References 4 publications

Third harmonic autocorrelation and wave mixing in a thin film of poly(p-phenylenevinylene)

Third harmonic autocorrelation and wave mixing in a thin film of poly(p-phenylenevinylene)

Spectroscopic Studies on the Radical-Cation Dimer of a Model Compound of Poly(p-phenylenevinylene). Similarities between the Dimer and the State of Positive Polarons in the Sulfuric-Acid-Treated Polymer

Optical Properties of a Supramolecular Assembly Containing Polydiacetylene

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