Influence of two-photon processes on the nonlinear optical response of polydiacetylene single crystals in the near-resonant spectral range

Schmid, W.; Vogtmann, Thomas; Schwoerer, M.

doi:10.1016/0301-0104(95)00005-4

Cited by 8 publications

(3 citation statements)

References 30 publications

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“…The measured value of |χ (3) | for the porphyrin polymer can be compared with those of other highly conjugated polymers, particularly those of polyacetylene and polydiacetylene, which are recognized as being among the materials possessing the largest fast-response nonlinearities currently available. ,, Table lists values of |χ (3) | which have been measured by DFWM for several conjugated polymers at a variety of wavelengths, and it is immediately obvious that polymer 1 is one of the most nonlinear materials. In making comparisons it should also be borne in mind that the value of |χ (3) | listed for the porphyrin polymer is for the xyyx element, whereas most of the other measurements are of the yyyy element, which by the arguments of Kleinman symmetry will be of the order of 3 times larger.…”

Section: Comparison With Related Materialsmentioning

confidence: 99%

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Large Third-Order Electronic Polarizability of a Conjugated Porphyrin Polymer

1999

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Degenerate four-wave mixing measurements, using 45 ps pulses at 1064 nm, have been used to determine the magnitude of the third-order optical susceptibility tensor for thin films of a conjugated porphyrin polymer. The time dependence of the signals indicates that the dominant response is fast relative to the duration of the optical pulses. It is shown that a response on this time scale cannot be consistent with a mechanism in which resonant absorption is significant, and therefore that the primary component of the susceptibility must correspond to an instantaneous electronic polarization. The microscopic polarizability per macrocycle of the polymer is approximately 3 orders of magnitude greater than that of the monomera result that indicates the role of inter-macrocycle conjugation in the nonlinearity. This appears to be the largest one-photon−off-resonance third-order optical susceptibility reported for any organic material.

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Section: Comparison With Related Materialsmentioning

confidence: 99%

“…The convention used for χ (3) is not specified. f Schmid et al |χ (3) | is referenced to CS 2 , but no absolute value is reported. The convention of Butcher and Cotter is adopted for χ (3) .…”

Section: Comparison With Related Materialsmentioning

confidence: 99%

Large Third-Order Electronic Polarizability of a Conjugated Porphyrin Polymer

1999

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“…A recent paper by Schmid showed that the susceptibility of PDA does not deviate from a pure χ (3) behavior until the peak intensity 10 8 W/cm 2 . 28 This seems to indicate that, neither exciton-exciton annihilation, nor excite-state absorption, is appreciable within the range of our consideration. One possible reason for the higher threshhold of exciton-exciton annihilation is that the exciton radius in PDA (about 10 Å) is much smaller than that in PPV (about 50 Å) and has higher saturation density.…”

Section: Absorption Spectra: Numerical Resultsmentioning

confidence: 60%

Resonant optical nonlinearity of conjugated polymers

Chang

Meng

1997

Phys. Rev. B

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When the energy of a pump wave is in resonance with the exciton creation energy, the electric susceptibility of a conjugated polymer in response to the probe wave is altered by the exciton gas. In this paper, we calculate the dependence of this change on the the exciton populations by the equation of motion (EOM) method. The magnitude of optical nonlinearity is also influenced by ambient temperature, by the extent of exciton wave functions, and by the strength of electron-electron interaction. All of these factors can be easily incorporated in the EOM approach systematically. Using the material parameters for polydiacetylene (PDA), the optical Kerr coefficient n2 obtained is about 10 −8 cm 2 /W, which is close to experimental value, and is four orders of magnitude larger than the value in nonresonant pump experiments.

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P - Z

Charra¹,

Gurzadyan²

Landolt-Börnstein - Group III Condensed Matter

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Influence of two-photon processes on the nonlinear optical response of polydiacetylene single crystals in the near-resonant spectral range

Cited by 8 publications

References 30 publications

Large Third-Order Electronic Polarizability of a Conjugated Porphyrin Polymer

Large Third-Order Electronic Polarizability of a Conjugated Porphyrin Polymer

Resonant optical nonlinearity of conjugated polymers

P - Z

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