Two-dimensional metal-chalcogenide films in tunable optical microcavities.

Area of Science:

• Materials Science
• Optics
• Condensed Matter Physics

Background:

• Quasi-two-dimensional (2D) metal-chalcogenide films offer unique optical properties.
• Optical microcavities confine light and enhance light-matter interactions.
• Integrating these materials into microcavities enables novel photonic applications.

Purpose of the Study:

• To create tunable optical microcavities incorporating monolayer Molybdenum Disulfide (MoS2) or few-layer Gallium Selenide (GaSe) films.
• To investigate the impact of these 2D materials on the spectral and temporal characteristics of photoluminescence (PL).

Main Methods:

• Fabrication of optical microcavities with integrated monolayer MoS2 or few-layer GaSe.
• Characterization of photoluminescence (PL) emission spectra and lifetime measurements.
• Analysis of spectral narrowing, wavelength tunability, and Purcell enhancement effects.

Main Results:

• Observation of spectrally narrow and wavelength-tunable cavity modes.
• Achieved high quality factors (up to 7400) for the microcavities.
• Demonstrated a significant 10-fold shortening of PL lifetime, indicating enhanced spontaneous emission rates.

Conclusions:

• The integration of 2D metal-chalcogenides into optical microcavities effectively modifies their photonic properties.
• Tunable cavity modes and enhanced spontaneous emission rates open avenues for advanced photonic devices.
• This work highlights the potential of MoS2 and GaSe in microcavity-based optoelectronics.