Brillouin microscopy has emerged as a non-invasive and label-free technique to map micro-mechanical properties of cells. Here we apply Brillouin microscopy to probe reorganization of F-actin network in respiratory cells treated with Timothy grass pollen protein extracts. The results of our measurements in conjunction with clustering data analysis confirm spatial cellular reorganization of F-actin proteins and compromised junctional integrity in treated cells as compared to controls.
A thin aluminum gallium nitride (AlGaN) electron blocking layer (EBL), above the active region, is used to improve the performance and reduce threshold current of indium gallium nitride (InGaN) quantum well (QW) lasers. A new structure, with delta barrier close to EBL (AlGaN/0.3 nm GaN/InGaN), was devised to prevent deleterious polarization effects and confer other advantages. The effect of a 0.3 nm-thick GaN delta barrier on the performance of a deep violet InGaN double QW laser was investigated using ISE TCAD software. The results indicate that the delta barrier significantly enhances the output power, slope efficiency and external differential quantum efficiency while decreasing the threshold current.
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