Open AccessTwo-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.