Wootten M B, Tan J, Chien Y J, Olesberg J T, Prineas J P
Optical Science and Technology Center, University of Iowa, Iowa City, IA 52242. ; Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242.
Optical Science and Technology Center, University of Iowa, Iowa City, IA 52242. ; Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242. ; Dept. of Chemistry, University of Iowa, Iowa City, IA 52242.
Semicond Sci Technol. 2014 Nov;29(11). doi: 10.1088/0268-1242/29/11/115014.
High power, high radiance, broadband light sources emitting in the 2.0-2.5 μm wavelength range are important for optical sensing of biomolecules such as glucose in aqueous solutions. Here we demonstrate and analyze superluminescent diodes with output centered at 2.4 μm (range ~2.2-2.5 μm) from GaInAsSb/AlGaAsSb quantum wells in a separate confinement structure. Pulsed wave output of 1 mW (38 kW/cm/sr) is achieved at room temperature for 40μm × 2mm devices. Superluminescence is evidenced in superlinear increase in emission, spectral narrowing, and angular narrowing of light output with increasing current injection. Optical output is analyzed and modeled with rate equations. Potential routes for future improvements are explored, such as additional Auger suppression and photonic mode engineering.
在2.0 - 2.5μm波长范围内发射的高功率、高辐射度宽带光源对于水溶液中生物分子（如葡萄糖）的光学传感非常重要。在此，我们展示并分析了一种采用分离限制结构、由GaInAsSb/AlGaAsSb量子阱构成的超发光二极管，其输出中心波长为2.4μm（范围约为2.2 - 2.5μm）。对于40μm×2mm的器件，在室温下实现了1mW（38kW/cm²/sr）的脉冲波输出。随着注入电流增加，发射的超线性增加、光谱变窄以及光输出的角度变窄都证明了超发光现象。利用速率方程对光输出进行了分析和建模。探索了未来改进的潜在途径，如进一步抑制俄歇复合和光子模式工程。
