Nonlinear absorption and integrated photonics applications of MoSSe

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Nonlinear optical (NLO) properties are crucial for advanced photonic applications.
• Molybdenum disulfide selenide (MoSSe) nanosheets are emerging as promising NLO materials.
• Understanding the influence of excitation parameters on NLO properties is essential for material optimization.

Purpose of the Study:

• To investigate the wavelength- and pulse-width-dependent NLO properties of liquid-phase exfoliated MoSSe nanosheets.
• To explore the potential of MoSSe in optoelectronic devices.
• To design and optimize a phase modulator utilizing MoSSe.

Main Methods:

• Experimental characterization of nonlinear optical properties (saturable absorption) under varying wavelengths and pulse widths.
• First-principles calculations to guide material design.
• Integration of monolayer MoSSe into a silicon slot waveguide for phase modulator simulation.

Main Results:

• MoSSe nanosheets exhibit superior saturable absorption in the visible region compared to the near-infrared.
• A better NLO response was observed with 6-ns pulses than with 380-fs pulses.
• Simulations confirmed high optical extinction for a MoSSe-integrated phase modulator.

Conclusions:

• MoSSe nanosheets possess significant nonlinear optical properties.
• The material's performance is dependent on excitation wavelength and pulse width.
• MoSSe shows excellent potential for developing high-performance optoelectronic devices and phase modulators.