Sıvı içindeki katı mikroyuvarlardan elastik ışık saçılması ve kiplenmesi

Optical microcavities have been extensively studied for the last few decades for theirpotential applications in lightwave communications and biochemical sensing. Among thedifferent microcavity shapes and configurations studied so far, the microsphere is simplestresonator type due to the self-forming, ideal, and perfect nature of the sphere. For a sphere,the solutions to the electromagnetic fields subject to the boundary conditions, lead to thehigh quality factor optical resonances, which are strongly dependent on the morphology,i.e., size, shape and refractive index, of the spherical resonator.In this work, solid dielectric and semiconductor microspheres are used asmicroresonators. The optical resonances of the microspheres are excited with tunable diodelasers through optical fiber half couplers. The observed transmission and the elasticscattering spectra reveal high quality factor optical resonances. The spheres are placed invarious liquids, such as liquid crystals, organic liquids and aqueous solutions for theinvestigation of these optical resonances.Nematic liquid crystals are highly birefringent molecules, which are vastly used indisplay technologies. Applying an external electric field to the nematic liquid crystalinduces changes in the refractive index of the medium external to the microsphere. Hencethe spectral position of the microspheres? optical resonances are tuned and used for signalmodulation. This state-of-the-art microfluidic system promises novel optical signalprocessing applications in liquid crystal display and optofluidic technologies.