Complex nonlinear refractive index of DNA

Marek Samoc*, Anna Samoc, James G. Grote

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    49 Citations (Scopus)


    Femtosecond Z-scan technique was used to determine the dispersion of the complex cubic nonlinear susceptibility (related to the nonlinear refractive index n2 and the two-photon absorption coefficient β2) of deoxyribonucleic acid (DNA) in the range of wavelengths from 530-1300 nm. The nonlinear refractive index of DNA varies from ≈ 2 × 10-15 to 1 × 10-14 cm2/W at λ = 1300-530 nm, respectively. Only a weak two-photon absorption is observed below λ = 600 nm with a nonlinear absorption coefficient β2 of about 0.2 cm/GW at λ = 530 nm. The dispersion is approximated with a simple complex expression.

    Original languageEnglish
    Pages (from-to)132-134
    Number of pages3
    JournalChemical Physics Letters
    Issue number1-3
    Publication statusPublished - 11 Nov 2006


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