激光器
饱和(图论)
吸收(声学)
波长
材料科学
异质结
光电子学
饱和吸收
半导体
半导体激光器理论
量子阱
级联
光学
强度(物理)
分子物理学
化学
物理
光纤激光器
数学
色谱法
组合数学
作者
Mathieu Jeannin,Eduardo Cosentino,Stefano Pirotta,Mario Malerba,G. Biasiol,Jean‐Michel Manceau,R. Colombelli
摘要
We demonstrate that absorption saturation of a mid-infrared intersubband transition can be engineered to occur at moderate light intensities of the order of 10–20 kW cm−2 and at room temperature. The structure consists of an array of metal–semiconductor–metal patches hosting a judiciously designed 253 nm thick GaAs/AlGaAs semiconductor heterostructure. At low incident intensity, the structure operates in the strong light–matter coupling regime and exhibits two absorption peaks at wavelengths close to 8.9 μm. Saturation appears as a transition to the weak coupling regime—and therefore, to a single-peaked absorption—when increasing the incident intensity. Comparison with a coupled mode theory model explains the data and permits to infer the relevant system parameters. When the pump laser is tuned at the cavity frequency, the reflectivity decreases with increasing incident intensity. When instead the laser is tuned at the polariton frequencies, the reflectivity non-linearly increases with increasing incident intensity. At those wavelengths, the system, therefore, mimics the behavior of a saturable absorption mirror in the mid-IR range, a technology that is currently missing.
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