Local density of states for different cancer cells in a one-dimensional photonic biosensor

Abstract In this work, we use dyadic Green’s functions to calculate local density of states in a finite-size one-dimensional photonic crystal surrounded by air. The crystal composes alternating layers of polymer materials, with its translational periodicity disrupted by the introduction of a cavity. Its optical properties are affected by variations in the polymers’ dielectric constant under applied pressure, and the cavity is infiltrated with four types of cells: Normal, Jurkat, PC12, and MCF-7. Our findings reveal that, within the photonic band gaps, the local density of states reaches a maximum, a characteristic of localized modes. We show that when the dielectric constant of each cell type is increased, the localized mode shifts to shorter frequencies, exhibiting a specific value for the local density of states. Furthermore, we report that the localized mode shifts to higher frequencies when pressure increases while reducing the local density of states.