研究目的
To demonstrate high-frequency operation of GaAs/AlGaAs very long wave infrared (VLWIR) quantum cascade detectors (QCDs) at 14.2 μm, focusing on reducing transmission loss and eliminating parasitic inductance for high-speed operation.
研究成果
The study successfully demonstrated high-frequency operation of VLWIR QCDs at 14.2 μm, with a ?3 dB cutoff frequency of 3.2 GHz for a 100×100 μm2 device. The integration of microwave technology and the use of a 50 Ω CPWG transmission line significantly reduced transmission loss and parasitic inductance, enabling high-speed operation.
研究不足
The study focuses on specific mesa sizes and may not cover all potential variations in device performance. The parasitic inductance and capacitance, although minimized, still affect the high-frequency operation.
1：Experimental Design and Method Selection:
The study used a resonant longitudinal optical-phonon scattering extraction relaxation mechanism for high-speed QCD operation. Microwave technology was integrated into the device process to reduce parasitic parameters.
2：Sample Selection and Data Sources:
The sample was grown on a semi-insulating GaAs substrate by molecular beam epitaxy, with thirty periods of active region sandwiched between doped GaAs contact layers.
3：List of Experimental Equipment and Materials:
Equipment includes a Nicolet 6700 Fourier transform infrared spectrometer, Keithley 2601A SourceMeter, and a microwave rectification setup. Materials include GaAs/AlGaAs for the QCD structure.
4：Experimental Procedures and Operational Workflow:
Square mesas of various sizes were fabricated using wet-etching techniques. A gold coplanar waveguide with a ground transmission line was patterned for high-frequency signal extraction.
5：Data Analysis Methods:
The electrical response characteristics were analyzed using a second order filter RLC circuit model to understand the frequency response.
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