Abstract
We demonstrate monolithic integrated quantum cascade detectors enhanced by plasmonic lenses. Surface normal incident mid-infrared radiation is coupled to surface plasmon polaritons guided to and detected by the active region of the detector. The lens extends the optical effective active area of the device up to a 5 times larger area than for standard mesa detectors or pixel devices while the electrical active region stays the same. The extended optical area increases the absorption efficiency of the presented device as well as the room temperature performance while it offers a flexible platform for various detector geometries. A photocurrent response increase at room temperature up to a factor of 6 was observed.
Highlights
Andreas Harrer,a) Benedikt Schwarz, Roman Gansch, Peter Reininger, Hermann Detz, Tobias Zederbauer, Aaron Maxwell Andrews, Werner Schrenk, and Gottfried Strasser
When photovoltaic quantum well infrared photodetectors (QWIPs) were discovered and the light detection capability of quantum cascade laser (QCL) structures was shown by Hofstetter et al.6 the starting point for quantum cascade detector7 (QCD) research was set
Since QCDs in the mid-infrared,8 near-infrared, and THz9 regions were demonstrated with significantly higher operating temperatures as known from QWIPs
Summary
Andreas Harrer,a) Benedikt Schwarz, Roman Gansch, Peter Reininger, Hermann Detz, Tobias Zederbauer, Aaron Maxwell Andrews, Werner Schrenk, and Gottfried Strasser. Surface normal incident mid-infrared radiation is coupled to surface plasmon polaritons guided to and detected by the active region of the detector. The extended optical area increases the absorption efficiency of the presented device as well as the room temperature performance while it offers a flexible platform for various detector geometries.
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