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Sub-100 Femtosecond All-Optical Modulation Beyond Electron-Phonon Limits.

Renxian Gao1,2, Jiayu Li3, Xiaoxiang Dong1

  • 1College of Physical Science and Technology, Xiamen University, Xiamen, 361005, People's Republic of China.

Nano-Micro Letters
|April 7, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel silver-silicon nanodisk antenna for ultrafast all-optical modulation. This breakthrough achieves sub-100 femtosecond modulation speeds, overcoming previous limitations in photonic computing.

Keywords:
Carrier dynamicsSilicon metastructure; Interfacial hotSilverSub 100 fs all Optical modulation

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Area of Science:

  • Photonics and Materials Science
  • Nanotechnology
  • Optical Computing

Background:

  • Ultrafast all-optical modulators are crucial for advanced photonic computing.
  • Plasmonic materials are limited to picosecond modulation speeds due to electron-phonon relaxation.
  • Achieving sub-100 femtosecond modulation is a key challenge.

Purpose of the Study:

  • To overcome the speed limitations of conventional all-optical modulators.
  • To demonstrate sub-100 femtosecond all-optical modulation.
  • To establish a new physical pathway for ultrafast modulation.

Main Methods:

  • Fabrication of a metastructured silver-single-crystal silicon nanodisk antenna.
  • Utilizing a nanoscale-confined volume to co-localize energy deposition and transfer.
  • Investigating interfacial carrier extraction dynamics.

Main Results:

  • Experimentally demonstrated all-optical modulation with sub-100 femtosecond resolution.
  • Established an interface-dominated modulation pathway that bypasses electron-phonon thermalization.
  • Achieved modulation speeds approaching intrinsic electronic response limits.

Conclusions:

  • The nanodisk architecture enables ultrafast modulation by controlling carrier dynamics at the interface.
  • This work provides a foundation for femtosecond photonic computing and ultrafast optical systems.
  • Overcoming the electron-phonon bottleneck is key to next-generation optical technologies.