Kristal ve amorf sıvılarda elastik ve elastik olmayan saçılma ile desteklenmiş yuvarlak ve düz yüzeyli silisyum ışık algılayıcıları

When light interacts with matter, absorption, scattering and fluorescence of light can take place depending on the wavelength and energy of the light together with the size of the interacting particle. In this work, we present light scattering enhancement of spherically shaped silicon photodetectors immersed in liquid environments. Our results indicate higher detection performance for spherical surface detectors as compared to conventional flat surface photodiodes. In order to characterize the photodiodes, we devised a measurement setup with a diode pumped solid state laser (DPSS) operating at 532 nm wavelength to induce light scattering in the liquid solutions. The solutions used were pure ethanol, 0.1 mM Rhodamine 640 perchlorate in ethanol, pure 5CB nematic liquid crystal, and 0.1 mM Rhodamine 640 perchlorate in 5CB, Rhodamine solution gives the ability of fluorescence in addition to the light scattering. We obtained elastic light scattering in ethanol and liquid crystal solutions and inelastic light scattering in fluorescent solutions with the laser dye. The silicon photodiodes were immersed in the solutions and characterized for their responsivity for the detection of scattering. Positional tomography for the voltage response of the photodetectors was recorded. It is seen that the flat photodetector responded as directional, whereas the sphere's responsivity pattern showed omnidirectional detection angle. Inelastic scattering, i.e. fluorescence increases the response. Elastic scattering by the LC also increases the response. Dye in LC has decreased response. Different solutions of laser dye in LC need to be studied for optimum performance. The results indicate higher performance for spherically shaped silicon photodetectors and these results can be applied to optics of highly scattering media.