Twisted π-system chromophores for all-optical switching

Guang S. He, Jing Zhu, Alexander Baev, Marek Samoć, David L. Frattarelli, Naoki Watanabe, Antonio Facchetti, Hans Ågren, Tobin J Marks, Paras N. Prasad

Research output: Contribution to journalArticle

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Abstract

Molecular chromophores with twisted π-electron systems have been shown to possess unprecedented values of the quadratic hyperpolarizability, β, with very large real parts and much smaller imaginary parts. We report here an experimental and theoretical study which shows that these twisted chromophores also possess very large values of the real part of the cubic hyperpolarizability, γ, which is responsible for nonlinear refraction. Thus, for the two-ring twisted chromophore TMC-2 at 775 nm, relatively close to one-photon resonance, n2 extrapolated to neat substance is large and positive (1.87 × 10-13 cm2/W), leading to self-focusing. Furthermore, the third-order response includes a remarkably low two-photon absorption coefficient, which means minimal nonlinear optical losses: the T factor, α2λ/n2, is 0.308. These characteristics are attributed to closely spaced singlet biradical and zwitterionic states and offer promise for applications in all-optical switching.

Original languageEnglish
Pages (from-to)6675-6680
Number of pages6
JournalJournal of the American Chemical Society
Volume133
Issue number17
DOIs
Publication statusPublished - May 4 2011

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Chromophores
Photons
Optical losses
Theoretical Models
Electrons
Refraction

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

He, G. S., Zhu, J., Baev, A., Samoć, M., Frattarelli, D. L., Watanabe, N., ... Prasad, P. N. (2011). Twisted π-system chromophores for all-optical switching. Journal of the American Chemical Society, 133(17), 6675-6680. https://doi.org/10.1021/ja1113112

Twisted π-system chromophores for all-optical switching. / He, Guang S.; Zhu, Jing; Baev, Alexander; Samoć, Marek; Frattarelli, David L.; Watanabe, Naoki; Facchetti, Antonio; Ågren, Hans; Marks, Tobin J; Prasad, Paras N.

In: Journal of the American Chemical Society, Vol. 133, No. 17, 04.05.2011, p. 6675-6680.

Research output: Contribution to journalArticle

He, GS, Zhu, J, Baev, A, Samoć, M, Frattarelli, DL, Watanabe, N, Facchetti, A, Ågren, H, Marks, TJ & Prasad, PN 2011, 'Twisted π-system chromophores for all-optical switching', Journal of the American Chemical Society, vol. 133, no. 17, pp. 6675-6680. https://doi.org/10.1021/ja1113112
He GS, Zhu J, Baev A, Samoć M, Frattarelli DL, Watanabe N et al. Twisted π-system chromophores for all-optical switching. Journal of the American Chemical Society. 2011 May 4;133(17):6675-6680. https://doi.org/10.1021/ja1113112
He, Guang S. ; Zhu, Jing ; Baev, Alexander ; Samoć, Marek ; Frattarelli, David L. ; Watanabe, Naoki ; Facchetti, Antonio ; Ågren, Hans ; Marks, Tobin J ; Prasad, Paras N. / Twisted π-system chromophores for all-optical switching. In: Journal of the American Chemical Society. 2011 ; Vol. 133, No. 17. pp. 6675-6680.
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