Marschick G, David M, Arigliani E, Opačak N, Schwarz B, Giparakis M, Delga A, Lagree M, Poletti T, Trinite V, Evirgen A, Gerard B, Ramer G, Maulini R, Butet J, Blaser S, Andrews A M, Strasser G, Hinkov B
Opt Express. 2022 Oct 24;30(22):40188-40195. doi: 10.1364/OE.470615.
Quantum cascade detectors (QCDs) are devices operating at zero external bias with a low dark-current. They show linear detection and high saturation intensities, making them suitable candidates for heterodyne detection in long-wave infrared (LWIR) free space optical communication systems. We present an approach to mitigate the performance limitation at long wavelengths, by a comparison of similar single and multi-period QCDs for optimizing their responsivity and noise behaviour. Our InGaAs/InAlAs/InP ridge QCDs are designed for operation at λ = 9.124 µm. Optical waveguide simulations support the accurate optical characterization. A detailed device analysis reveals room-temperature responsivities of 111 mA/W for the 15-period and 411 mA/W for the single-period device.
量子级联探测器（QCDs）是在零外部偏置下工作且暗电流较低的器件。它们具有线性检测和高饱和强度，使其成为长波红外（LWIR）自由空间光通信系统中进行外差检测的合适候选器件。我们通过比较类似的单周期和多周期QCDs以优化其响应度和噪声特性，提出了一种减轻长波长性能限制的方法。我们的InGaAs/InAlAs/InP脊形QCDs设计用于在λ = 9.124 µm下运行。光波导模拟支持精确的光学表征。详细的器件分析表明，15周期器件在室温下的响应度为111 mA/W，单周期器件为411 mA/W。
