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Monolithically integrated mid-infrared quantum cascade laser and detector.

Benedikt Schwarz¹, Peter Reininger, Hermann Detz

¹Institute for Solid State Electronics and Center for Micro- and Nanostructures, Vienna University of Technology, 1040 Vienna, Austria. benedikt.schwarz@tuwien.ac.at

Sensors (Basel, Switzerland)

|February 8, 2013

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Researchers developed a novel bi-functional quantum cascade active region for integrated mid-infrared lasers and detectors. This on-chip system enables low-power sensing applications and lab-on-a-chip devices.

Area of Science:

Optoelectronics
Quantum Cascade Lasers
Mid-Infrared Technology

Background:

Quantum cascade lasers (QCLs) are crucial for mid-infrared (MIR) applications.
Integrating lasers and detectors on a single chip simplifies optical systems.

Purpose of the Study:

To demonstrate a monolithic integration of a MIR laser and detector using a single bi-functional quantum cascade active region.
To enable on-chip optical intensity measurements without external components.
To explore potential applications in low-power sensors and lab-on-a-chip devices.

Main Methods:

Utilized a bi-functional quantum cascade active region with a bound-to-continuum design.
The active region provides optical gain when biased and acts as a detector at zero bias.

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Monolithically integrated laser and detector on the same chip.

Main Results:

Achieved on-chip detection of laser light without external optics or amplification, measuring a peak signal of 191.5 mV.
Demonstrated room-temperature pulsed emission with low average power consumption (4 mW).
The active region exhibited a broad electroluminescence spectrum (200 cm⁻¹), suitable for single-mode laser arrays.

Conclusions:

The bi-functional quantum cascade structures enable monolithic integration of MIR lasers and detectors.
The developed devices are suitable for high-speed, low-power MIR sensing.
This technology holds significant potential for creating mid-infrared lab-on-a-chip systems.