Two-photon absorption arises from two-dimensional excitons | Zendy

Feng Zhou | Zendy; Jing Han Kua | Zendy; Shunbin Lu | Zendy; Wei Ji | Zendy

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Two-photon absorption arises from two-dimensional excitons

Author(s) -

Feng Zhou,

Jing Han Kua,

Shunbin Lu,

Wei Ji

Publication year - 2018

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.26.016093

Subject(s) - monolayer , exciton , photon , attenuation coefficient , two photon absorption , materials science , absorption (acoustics) , nonlinear optics , optics , absorption spectroscopy , molecular physics , atomic physics , physics , condensed matter physics , nanotechnology , laser

By applying quantum perturbation theory to two-dimensional excitons in monolayer transition metal dichalcogenides (TMDCs), we develop a theoretical model for two-photon absorption in the near infrared spectral region. By assuming the bandwidth of the final excitonic state to be 0.15 eV, the two-photon absorption coefficients are as high as 50 cm/MW and selenium-based, monolayer TMDCs exhibit greater 2PA coefficients than sulfur-based, monolayer TMDCs. Our model is also compared to the experimental data obtained by Z-scans or nonlinear transmission measurements.

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