The simplest arrangement to consider is a fluorophore embedded in silicon dioxide (refractive index ) a distance d from an interface with silicon (refractive index ). The fluorophore is excited by light of wavelength  and emits light of wavelength .
A straightforward setup includes a fluorophore embedded in silicon dioxide (with a refractive index) at a distance d from an interface with silicon (also having a refractive index). This fluorophore is stimulated by light of wavelength, which causes it to emit light of wavelength.