Abstract
We develop a theoretical model to quantify the two-photon absorption (2 PA) coefficients of monolayer . Based on two-dimensional excitons, our model reveals the 2 PA coefficient spectrum on the order of 0.01–0.1 cm/MW in the near-infrared for monolayer . As compared to the band theory for bulk semiconductors, these coefficients are enhanced by at least one order of magnitude. Our model is in agreement with light-intensity-dependent photocurrent measurements on a monolayer , subband photodetector with femtosecond laser pulses.
© 2017 Optical Society of America
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