Yingqiang Xu

Effectively extracting photogenerated carriers from both high- and low-energy photons remains a critical challenge in the development of ultra-broadband photodetectors spanning the short- to long-wave spectrum. This work presents an ultra-broadband single-junction photodetector based on InAs/GaSb superlattices. The device incorporates two distinct absorption regions—short- and long-wavelengths—to synergistically enhance the spectral response.

It has always been difficult to achieve high-efficiency optical coupling from edge-emitting semiconductor laser diodes (LDs) to fibers, especially for the mid-infrared wavelength range due to the larger divergence angle. To improve the coupling efficiency, we systematically put up a theoretical model based on the hyperbolic-shaped fiber and used a genetic algorithm to optimize the wedge angle and tip radius of the wedge-shaped cylindrical lensed fiber, calculating the maximal coupling efficiency.

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