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Updated: Jun 6, 2026

Patterning via Optical Saturable Transitions - Fabrication and Characterization
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Opto-optical edge defect mitigation in solution-processed WSe2 thin films for high-efficiency optical modulation.

Jianan Li1,2, Zefeng Xu1,2, Yuan Chen3

  • 1Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore.

Nature Communications
|June 4, 2026
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Summary

Engineered defects in tungsten diselenide (WSe2) nanosheets enhance optical modulator efficiency by reducing losses and improving light-matter interaction. This defect regulation offers a scalable path for high-performance photonic devices.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Two-dimensional (2D) optical modulators face efficiency limitations due to defect-induced losses and weak light-matter interactions.
  • Edge defects in solution-processed WSe2 nanosheets, characterized by metallic 1T domains and semiconducting 2H interiors, contribute to these limitations.

Purpose of the Study:

  • To investigate the dynamic saturation of edge defects in WSe2 nanosheets via carrier trap filling.
  • To enhance the performance of 2D optical modulators by engineering defect states and controlling carrier distribution.

Main Methods:

  • Solution processing of WSe2 nanosheets with controlled lateral size.
  • Dynamic saturation of edge defects through optical or electrical excitation.
  • Characterization of modulation efficiencies, complex refractive index changes, and device performance in C-band modulators integrated with micro-ring resonators.

Main Results:

  • Defect saturation reduced nonradiative recombination and reshaped carrier distribution, enhancing excitonic response.
  • Achieved improved photoluminescence peak modulation efficiencies: 0.025 eV·V⁻¹ (electro-optic) and 0.1 eV·mW⁻¹ (opto-optic).
  • Demonstrated efficient C-band modulation (1530-1565 nm) with a tuning efficiency of 1.84 × 10⁻⁵ pm⁻¹·mW·m², alongside fast modulation dynamics (~48.1 ns rise, ~79.4 ns fall).

Conclusions:

  • Engineered defect regulation in WSe2 is a viable and scalable strategy for high-performance 2D optical modulators.
  • The findings establish a new pathway for overcoming efficiency bottlenecks in 2D photonic devices.