Optical Transport in Bidispersed Magnetic Colloids with Varying Refractive Index

A modified approach is established to analyze magnetic tuning of refractive index and subsequent variation in optical transport in bidispersed magnetic colloids. Conceptual equivalence of wavelength variation with refractive index tuning is utilized using effective medium approach. Magnetic tuning of refractive index of magnetic nanofluids controls the optical scattering by large magnetic spheres in bidispersed magnetic colloids. The intensity correlation with varying refractive index is used to compare the experimental optical transport. Reduction in optical transport is explained on the bases of standing waves generated due to Mie resonance within the scatterers that delays the magnetically induced optical transport. Here, we examine the role played by refractive index tuning in optical transport in bidispersed magnetic colloids. This new approach can be useful for tunable optical and photonic devices.