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Updated: Apr 2, 2026
07:38
Carrier Lifetime Measurements in Semiconductors through the Microwave Photoconductivity Decay Method
Published on: April 18, 2019
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Free-carrier lifetime measurement in integrated Q-InP channel waveguides for quantum applications
Optics Letters
|April 1, 2026
Summary
We measured the free-carrier lifetime (FCL) in a novel quaternary InP waveguide. This critical parameter, 2.32 ns, is essential for managing nonlinear losses in photonic devices.
Area of Science:
- Integrated photonics
- Semiconductor materials science
- Nonlinear optics
Background:
- Free-carrier lifetime (τFCL) governs material nonlinear dynamics.
- It impacts nonlinear losses from two-photon absorption (TPA) and free-carrier absorption (FCA).
- Indium Phosphide (InP) waveguides offer high nonlinearity for applications like single-photon generation via spontaneous four-wave mixing (SFWM).
Purpose of the Study:
- To experimentally determine the free-carrier lifetime (τFCL) of a commercial quaternary InP (Q-InP) passive channel waveguide.
- To provide crucial data for managing nonlinear losses in InP-based photonic integrated circuits.
Main Methods:
- Utilized pump-probe spectroscopy to measure τFCL.
- Characterized a low-footprint Q-InP channel waveguide from SMART Photonics foundry.
Main Results:
- Experimentally determined τFCL to be 2.32 (±0.12) ns.
- Measured τFCL in a 0.564 mm long waveguide.
Conclusions:
- The measured τFCL is vital for optimizing input power levels in 1550 nm InP waveguides.
- Accurate τFCL values are necessary to mitigate nonlinear losses, especially TPA, in high-performance photonic devices.
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