Mikrokürelerden Gaussian ışık demetinin esnek saçılımı

Elastic Scattering Gaussian Beams from MicrospheresAbstractMicrospheres have received increasing attention as optical microcavityresonators due to their high quality Morphology Dependent Resonances(MDRs). Numerous applications have been realized by using microsphereMDRs in photonics, optoelectronics, and optical communication systems.Wavelength selective properties of resonances in microspheres have beenused as a building block for filtering, multiplexing, switching, and channeldropping applications. Microsphere based biosensors has been attractingthe attention of the photonics community due to their high sensitivity,selectivity and implementation. Adsorption of different biomolecules on thesurface of microspheres causes a change of effective size and refractiveindex leading to the shift of resonance wavelengths. A photonic biosensor,based on this phenomenon, can detect a single molecule sensitivelydepending on the configuration.In this work, rainbow effects on microspheres are studied numericallyby using Generalized Lorenz Mie Theory (GLMT). GLMT description ofGaussian beam scattering by a microsphere is an excellent analytical toolto accurately model the sphere-Gaussian-beam interaction. Angularlyresolved Gaussian beam scattering spectra are presented to observe theeffect of rainbows on MDRs. Obtained results show that rainbows give riseto increased scattering intensity around MDRs. Phase behavior of the totalscattered field is observed in the spectra around rainbow angles. Therainbow-enhanced MDRs and associated phase characteristics provide anadditional enhancement of the already sharp MDRs of microspheres forsensing applications.