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Wavelength tunable microdisk cavity light source with a chemically enhanced MoS2 emitter.

Jason C Reed1, Alexander Y Zhu, Hai Zhu

  • 1Department of Materials Science and Engineering and ‡Department of Electrical and Systems Engineering, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States.

Nano Letters
|February 28, 2015
PubMed
Summary

We developed a brighter, highly coherent narrowband light source using molybdenum disulfide (MoS2) integrated with a microdisk cavity. This novel nanophotonic light source offers enhanced photoluminescence and tunable emission for advanced applications.

Keywords:
2D SemiconductorMoS2microdisk optical cavitynarrowband light sourcephotoluminesence enhancement

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Area of Science:

  • Nanophotonics
  • Materials Science
  • Optoelectronics

Background:

  • Whispering gallery mode resonators are crucial for integrated optics.
  • Atomically thin materials like molybdenum disulfide (MoS2) show promise for light emission.
  • Efficient light extraction and high spatial coherence are key challenges in nanophotonic light sources.

Purpose of the Study:

  • To create an integrated narrowband light source with high spatial coherence and efficient light out-coupling.
  • To enhance the photoluminescence of MoS2 for improved light source performance.
  • To investigate the tunability and thermal properties of the MoS2-microdisk system.

Main Methods:

  • Integration of chemically enhanced bilayer MoS2 flakes with a SiO2 protective coating onto a microdisk cavity.
  • Fabrication of a microdisk cavity with a spatial notch for emission out-coupling.
  • Characterization of photoluminescence intensity, spatial coherence, quality factor, and effective index tuning.

Main Results:

  • Achieved a 20-times increase in photoluminescence brightness compared to monolayers.
  • Observed high quality factors (≈ 1000) and high spatial coherence.
  • Demonstrated effective index tuning of cavity-coupled emission over a full free spectral range.
  • Studied the thermal response of the integrated system.

Conclusions:

  • The developed MoS2-microdisk system represents a significant advancement in integrated narrowband light sources.
  • The combination of chemically enhanced MoS2 and microdisk cavities offers a pathway to brighter, more coherent on-chip light emitters.
  • This work provides valuable insights for designing next-generation nanophotonic devices utilizing atomically thin active materials.