1 research outputs found
Resonant Light-Induced Heating in Hybrid Cavity-Coupled 2D Transition-Metal Dichalcogenides
Hybrid structures based on integration
of two-dimensional (2D)
transition-metal dichalcogenides (TMDCs) with optical resonators have
recently earned significant attention. The enhanced interaction of
light with 2D materials in such hybrid structures can enable devices
such as efficient light-emitting diodes and lasers. However, one of
the factors affecting the performance of such devices is the effect
of the optically induced heat on the optoelectronic properties of
the 2D materials. In this study, we systematically investigate principal
roots of heat generation in hybrid cavity-coupled few-atomic-layer-thick
2D TMDC films under optical pumping. The optical resonator exploited
here is a Fabry–Perot (FP) resonator, which can enhance the
light–MoS<sub>2</sub> interaction by a significant factor of
60 at its resonance wavelength. We have combined an accurate theoretical
modeling with experimental Raman spectroscopy to determine the roots
of heat generation in MoS<sub>2</sub> films integrated with FP resonators.
Our investigations reveal that the strong modulation of light absorption
in the MoS<sub>2</sub> film, induced by excitation of an FP cavity
at its resonant frequency, plays the primary role in excess heat generation
in 2D materials. Furthermore, through varying the cavity length, we
show that on-resonance and off-resonance excitation of the cavity
results in completely different temperature profiles in the cavity-coupled
MoS<sub>2</sub> films. Also, by changing the resonance medium of the
FP cavity (SiO<sub>2</sub> and air), we take into account the role
of the heat sinking effect of the substrate in heat generation in
MoS<sub>2</sub> films. In this study, the temperature-dependent red-shift
of the Raman spectra is employed to monitor the local temperature
of the MoS<sub>2</sub> films. Our results show the importance of the
heating effect in such hybrid structures and represent a step forward
for the design of practical hybrid optical devices based on layered
semiconducting 2D materials