Femtosecond time resolved molecular dynamics of a polydiacetylene backbone

Bigot, Jean‐Yves; Pham, T. A.; Barisien, Thierry

doi:10.1016/0009-2614(96)00864-0

Cited by 32 publications

(21 citation statements)

References 16 publications

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“…The underlying symmetric C-C stretch vibrations [ Fig. 1(d)] are found in many other C-C covalent-bond systems and were subject to several impulsive SRS studies, for instance, on carbon nanotubes [29], graphene [30], and organic molecules [31].…”

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confidence: 99%

Terahertz Sum-Frequency Excitation of a Raman-Active Phonon

et al. 2017

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In stimulated Raman scattering, two incident optical waves induce a force oscillating at the difference of the two light frequencies. This process has enabled important applications such as the excitation and coherent control of phonons and magnons by femtosecond laser pulses. Here, we experimentally and theoretically demonstrate the so far neglected up-conversion counterpart of this process: THz sumfrequency excitation of a Raman-active phonon mode, which is tantamount to two-photon absorption by an optical transition between two adjacent vibrational levels. Coherent control of an optical lattice vibration of diamond is achieved by an intense terahertz pulse whose spectrum is centered at half the phonon frequency of 40 THz. Remarkably, the carrier-envelope phase of the THz pulse is directly transferred into the phase of the lattice vibration. New prospects in general infrared spectroscopy, action spectroscopy, and lattice trajectory control in the electronic ground state emerge.

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confidence: 99%

Terahertz Sum-Frequency Excitation of a Raman-Active Phonon

et al. 2017

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“…The rise and decay dynamics is quantitatively identical with that of a polycrystalline film of ply-DCHD. [3,4] Moreover, the Same time constants were obtained withm the experimental errors for 30, 100 and 150 nm microcrystals, independent with the crystalline size. This is in contrast to the fact that the peak of the exciton band was slightly red-shifted with the crystal size.…”

Section: Femtosecond Transient Absontion S-pect Ramentioning

confidence: 68%

Femtosecond Transient Absorption Spectroscopy of Nanocrystalline Polydiacetylene Colloids

Asahi

Kibisako

Masuhara

et al. 1998

Molecular Crystals and Liquid Crystals Science and Technology.

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Femtosecond transient absorption spectral measurements have been performed for sizeantrolled polydiacetylene microcrystals (30, 100, and 150 nm mean diameter) dispersed in water. Ultrafast relaxation processes within 5 ps after excitation were attributed to formation and decay of self-trapped exciton, which was independent on the size. A time-dependent spectral shift of transient bleaching, corresponding to the stationary excitonic absorption band, was observed in the time region from 10 ps to a few ns. It is explained as a thermalization of absorbed light energy within the microcrystal and the succeeding cooling by comparing transient absorption spectra w i t h temperature difference spectra of the ground state absorption. Size-dependent cooling dynamics of a 'hot' microcrystal was successfully demonstrated; the time constant increases w i t h the crystal size.

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“…The ultrafast optical responses in PDAs have been intensively investigated by femtosecond time-resolved pump-probe spectroscopy and picosecond to femtosecond time-resolved Raman spectroscopy [2,6,10,11,[21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

“…From previous extensive studies, [2,6,10,11,[21][22][23][24][25][26][27][28][29][30] the initial changes in electronic absorption spectra and their ultrafast dynamics in a femtosecond region after photoexcitation of polydiacetylene (PDA) are explained in terms of the geometrical relaxation (GR) of a free exciton (FE) to a STE within 100 fs [2]. The STE is well established to be a geometrically relaxed state with admixture of butatriene-type configuration (ÀCR=C=C=CR 0 À) n from an acetylene-type chain (=CRÀCCÀCR 0 À) n [21,22] the substituted side groups R and R 0 represent attached to the main chain.…”

Section: Introductionmentioning

confidence: 99%

“…The STE is well established to be a geometrically relaxed state with admixture of butatriene-type configuration (ÀCR=C=C=CR 0 À) n from an acetylene-type chain (=CRÀCCÀCR 0 À) n [21,22] the substituted side groups R and R 0 represent attached to the main chain. All of the stretching vibrations of carbon atoms are considered to be coupled to the photogenerated FE and induce various nonlinear optical processes different from those in most of inorganic semiconductors [10][11][12][13]28,31].…”

Section: Introductionmentioning

confidence: 99%

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Ultrafast Optical Nonlinearity in Polydiacetylenes Studied by Sub-5-fs Laser

Kobayashi

Ikuta

2006

Molecular Crystals and Liquid Crystals

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Molecular vibration of several modes in blue-phase polydiacetylene-3-butoxycarbonylmethylurethane (PDA-3BCMU) was real-time observed by 5-fs pump-probe measurement. The contribution of the vibrational wavepackets in the ground state and in the excited state in the signal were separated by multichannel measurements The C=C stretching mode in the ground state starts to oscillate p-out-ofphase with the CC stretching mode. The structure of PDA-3BCMU in the geometrically relaxed state is not pure butatriene-type but more like acetylene-type. The frequencies of C=C and CC stretching modes there were determined by singular value decomposition method to be 1472 AE 6 cm À1 and 2092 AE 6 cm À1 , respectively. The double and triple bond stretching frequencies in the ground state which are 1463 AE 6 cm À1 and 2083 AE 6 cm À1 , respectively.

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Femtosecond time resolved molecular dynamics of a polydiacetylene backbone

Cited by 32 publications

References 16 publications

Terahertz Sum-Frequency Excitation of a Raman-Active Phonon

Terahertz Sum-Frequency Excitation of a Raman-Active Phonon

Femtosecond Transient Absorption Spectroscopy of Nanocrystalline Polydiacetylene Colloids

Ultrafast Optical Nonlinearity in Polydiacetylenes Studied by Sub-5-fs Laser

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