光电子学
材料科学
激光线宽
光学
共振(粒子物理)
激光器
探测器
红外线的
兰姆达
波长
比探测率
量子效率
响应度
光电探测器
物理
原子物理学
作者
Chul Soo Kim,Mijin Kim,C. L. Canedy,Eric M. Jackson,Chase T. Ellis,Richard L. Espinola,Jill A. Nolde,E. H. Aifer,I. Vurgaftman,J. R. Meyer,Vijaysekhar Jayaraman,B. Kolasa,Christopher Burgner,B. Knipfer,Robert Marsland
摘要
Resonant cavity infrared detectors (RCIDs) can reduce the noise in sensing a laser signal by strongly suppressing background photocurrent at wavelengths outside the narrow spectral band of interest. We recently reported an RCID with 100-nm-thick InAsSb/InAs absorber, GaAs/AlGaAs bottom mirror, and Ge/SiO2 top mirror. At T = 300 K, the external quantum efficiency reached 58% atλres ≈ 4.6 μm, with linewidth δλ = 27 nm. The characteristics at 125 K implied a specific detectivity of 5.5 × 1012 cm Hz½/W, which is more than 3× higher than for a state-of-the-art broadband HgCdTe device operating at that temperature. However, a prominent variation with mesa diameter of the deposited Ge spacer thickness made it difficult to predictably control λres for devices processed with a given diameter. This has been addressed by measuring the reflectivity spectrum following deposition of the spacer, so that thicknesses of the top mirror's SiO2 and Ge layers could be adjusted appropriately to attain a targeted resonance. This was especially beneficial in matching the λres for a small mesa, needed to minimize the capacitance in high-frequency measurements, to the emission wavelength of a given ewquantum cascade laser.
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