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Voltage-Controlled and Injector Layer Thickness-Dependent Tuning of Quantum Cascade Laser for Terahertz Spectroscopy
Mariusz Mączka1, Grzegorz Hałdaś1
1Department of Electronics Fundamentals, Faculty of Electrical and Computer Engineering Rzeszow University of Technology, 35-959 Rzeszow, Poland.
ACS Applied Materials & Interfaces
|April 15, 2025
Summary
Quantum cascade lasers (QCLs) offer precise terahertz imaging for molecular identification. Adjusting QCL injector dimensions allows for tunable spectral regions, enabling versatile imaging applications.
Area of Science:
- Optics and Photonics
- Quantum Electronics
- Spectroscopy
Background:
- Terahertz (THz) imaging systems require tunable light sources for molecular identification.
- Quantum cascade lasers (QCLs) are promising for THZ applications due to their unique emission properties.
Purpose of the Study:
- To numerically investigate the tuning capabilities of quantum cascade lasers (QCLs) for terahertz imaging.
- To explore methods for achieving precise spectral control in QCLs.
Main Methods:
- Utilized the Infinite and Finite Model of Superlattice (IMSL and FMSL) approach for rapid prediction of QCL tuning trends.
- Validated model predictions with detailed radiation maps from the Real Space Model (RSM).
- Investigated the impact of power supply and injector region geometry on QCL tuning.
Main Results:
- Demonstrated that QCL tuning is achievable by adjusting power supply and injector dimensions.
- Identified high sensitivity of QCL optical gain to injector width variations.
- Showcased the ability to create multiple separate or a single continuous tuning region with minimal spectral shift.
Conclusions:
- Numerical models accurately predict QCL tuning behavior for terahertz imaging.
- Injector geometry is a critical parameter for controlling QCL spectral output.
- QCLs offer flexible and precise tuning for advanced molecular identification in THz imaging.
