Abstract

In this work, we experimentally study the nonlinear absorption enhancement of saturable absorption and two-photon absorption on a hybrid structure comprising a monolayer ${\mathrm{MoS}}_2$ and Au nanoantennas via femtosecond I-scan measurement. Specifically, a 13-fold increment in the linear absorption coefficient is attained at 1.85 eV, along with an 8-fold enhancement of the two-photon absorption coefficient at 1.65 eV, which is attributed to exciton–plasmon coupling resonance and plasmonic hot electron transfer. The exciton–plasmon coupling effect is characterized by stable photoluminescence experiments. Furthermore, the exciton recombination time is extracted from the pump–probe measurement, whose value in the hybrid structure is shortened from 18.5 ps (pure ${\mathrm{MoS}}_2$) to 1.84 ps. Our findings facilitate a new perspective to modulate the nonlinear optical response and to promote the performance of nonlinear photonic devices.

© 2019 Optical Society of America

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