Quantum Dot Photodetector Enhancements in Mid-Infrared Applications
Summary
Quantum dot infrared photodetectors (QDIPs) harness confined electronic states within semiconductor nanostructures to achieve wavelength-selective absorption in the mid-infrared (mid-IR) band. Recent advances have addressed long-standing challenges in sensitivity, noise reduction and operating temperature through novel device architectures and light-management strategies. InAs, Ge/SiGe and other material systems have been combined with plasmonic or dielectric nanostructures to concentrate incident radiation, increase absorption cross-section and tune spectral response. Concurrent improvements in quantum dot design, barrier engineering and carrier injection schemes have elevated detectivity and responsivity while suppressing dark current. These enhancements open pathways to compact, uncooled mid-IR imaging, chemical sensing and free-space communications with improved performance, manufacturability and integration into silicon photonics platforms.
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Quantum Dot Photodetector Enhancements in Mid-Infrared Applications publication trend
The graph below shows the total number of articles in quantum dot photodetector enhancements in mid-infrared applications across all publications each year (not limited to Nature Index journals).
Technical terms
Quantum dot infrared photodetector (QDIP): A photodetector in which semiconductor quantum dots provide discrete energy levels for mid-IR absorption and carrier generation.
Surface plasmon wave (SPW): A collective oscillation of free electrons at a metal–dielectric interface that confines electromagnetic fields at subwavelength scales.
Responsivity: The photocurrent produced per unit incident optical power, typically expressed in amperes per watt (A/W).
Detectivity (D*): A figure of merit quantifying a detector’s sensitivity, normalised to area and bandwidth, in units of cm·Hz1/2/W.
Plasmonic coupling: The enhancement of light–matter interaction achieved by matching quantum dot transition energies with resonant plasmon modes to increase absorption efficiency.
References
- Plasmonic-coupled quantum dot photodetectors for mid-infrared photonics.. Optics Express (2021).
- Photovoltaic Ge/SiGe quantum dot mid-infrared photodetector enhanced by surface plasmons.. Optics Express (2017).
- Quantum dot infrared photodetector enhanced by surface plasma wave excitation. Optics Express (2009).
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