Mouse Tissue imaging by random laser of Plasmonic two dimensional array

Given the major applications of high resolution, and non-destructive bio-imaging, plasmonic waveguide assisted imaging system based on the random lasing is proposed here by helping micro ring arrays covered with the gold/ graphene layer and Rh6G dye. In order to achieve this objective, we employ a laser writing system to create micro ring arrays and subsequently cover them with a plasmonic gold thin film using a sputtering machine. Additionally, the chemical vapor deposition method is employed to generate the graphene layer. To use this medium as random laser active media, we cover it by Rh6G dye and PVP polymer as the top high index layer to get more localization of light. After theoretically and experimentally evaluating the plasmonic substrate, we use second harmonic generation of Nd: YAG laser as the source, and record the random lasing of the sample under 45 degree via spectrometer. Our results show the samples without PVP layer yield a coherent random laser with about 6 nm and 1.4 nm in the full width at half maximum (FWHM), threshold energy 3.17 mJ and 1.42 mJ for concentrations 10 − 5 and 10 − 4, respectively. While finding the laser threshold and FWHM are decreased by the sample with PVP layer reach from 2.62mJ and 5 nm to 1.95 mJ and 1.2 nm, respectively. This corresponded to the simulation part, in which PVP layer enhanced the field amplitude significantly. Finally, we record the images of mouse tissue by the CCD camera. These findings provided a simple and efficient way for the realization of low-threshold random lasers at low cost.