Abstract:In this work we propose two novel sensing principles of detection that exploit the magnetic dipolar Mie resonance in high-refractiveindex dielectric nanospheres. In particular, we theoretically investigate the spectral evolution of the extinction and scattering cross sections of these nanospheres as a function of the refractive index of the external medium (n ext ). Unlike resonances in plasmonic nanospheres, the spectral position of magnetic resonances in high-refractive-index nanospheres barely shifts as n ext changes. Nevertheless, there is a drastic reduction in the extinction cross section of the nanospheres when n ext increases, especially in the magnetic dipolar spectral region, which is accompanied with remarkable variations in the radiation patterns. Thanks to these changes, we propose two new sensing parameters, which are based on the detection of: i) the intensity variations in the transmitted or backscattered radiation by the dielectric nanospheres at the magnetic dipole resonant frequency, and ii) the changes in the radiation pattern at the frequency that satisfies Kerker's condition of near-zero forward radiation. To optimize the sensitivity, we consider several semiconductor materials and particles sizes. "Improved performance of aminopropylsilatrane over aminopropyltriehoxysilane as a linker for nanoparticlebased plasmon resonance sensors," Sens.