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Related Experiment Video

Updated: Mar 17, 2026

Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
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All-optical modulation in Mid-Wavelength Infrared using porous Si membranes.

Sung Jin Park1, Ammar Zakar1, Vera L Zerova1

  • 1Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Edgbaston B15 2TT, United Kingdom.

Scientific Reports
|July 22, 2016
PubMed
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We achieved all-optical modulation of porous Silicon (pSi) membranes in the Mid-Wavelength Infrared (MWIR) range. This breakthrough enables high-speed optical modulation for advanced thermal imaging and communication applications.

Area of Science:

  • Optoelectronics
  • Materials Science
  • Infrared Spectroscopy

Background:

  • Porous Silicon (pSi) is a versatile material with tunable optical properties.
  • Mid-Wavelength Infrared (MWIR) applications require efficient modulation techniques.

Purpose of the Study:

  • To demonstrate all-optical modulation of pSi membranes in the MWIR range.
  • To investigate the mechanisms and speed of this modulation.

Main Methods:

  • Femtosecond pump-probe spectroscopy was employed.
  • An 800 nm, 60 fs pump pulse and a tunable MWIR probe (3.5–4.4 μm) were used.
  • Time-resolved measurements were conducted to determine modulation dynamics.

Main Results:

  • A natural transparency window for pSi was observed around 4 μm.

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  • Achieved 55% modulation contrast with 60 mW pump power.
  • Identified free charge carrier interaction as the primary modulation mechanism.
  • Demonstrated sub-picosecond rise time and ~15 GHz modulation speed.

    • Conclusions:

    • All-optical modulation of pSi in the MWIR range is feasible.
    • The observed modulation characteristics are suitable for high-speed applications.
    • Potential applications include thermal imaging and free-space optical communications.