Light Trapping in InAsSb-based barrier Photodetectors for Enhanced Mid-Wave Infrared Bio-Medical Sensing: A Study on Jurkat Biomarker Detection

This work presents the performance results of InAsSb-based n-cantact/barrier/n-absorber mid-wave infrared detectors, employing a Ge/BaF
2
2-stacks mirror reflector with exceptional reflectivity exceeding ~90%. The focus of the investigation is on evaluating their effectiveness for Jurkat biomarker detection. The analysis includes a comprehensive examination of the dark current characteristics exhibited by this proposed device. Significantly, the findings reveal a remarkably low dark current level of approximately $2.032 \times 10^{-5}$ A/cm$^{2}$ at 300 K, indicating its suitability for high-temperature operation. Additionally, we assess the spectral response of the device and observe peak current, responsivity and quantum efficiency values of 1.19 A/W and 0.37 respectively, when subjected to an incident light density of 1 W/cm$^{2}$. These metrics demonstrate impressive levels even under lower incident power densities, reaching values as high as 502.74 A/W for peak current responsivity and 155.85 for quantum efficiency when exposed to an incident power density as low as 10$^{-3}$ W/cm$^{2}$. These significant findings validate the importance and effectiveness of utilizing light trapping methods based on Ge/BaF
2
mirror reflector in enhancing detector performance within this context.