Patent ID: 7939339

Claim:
An arrangement for fluorescence enhancement, comprising: a substrate; a fluorescence enhancing coating applied on the substrate; and a fluorescencable material on the fluorescence enhancing coating, wherein the fluorescencable material, when irradiated with an excitation light of an excitation wavelength λ A , emits light in an emission wavelength λ E , wherein the fluorescence-enhancing coating has a light reflecting interference layer system comprising high and low refractive index dielectric layers so that an enhanced electric field amplitude of the excitation light is achieved in the region of the fluorescencable material by a constructive superposition of the electric field amplitudes of the incident and the reflected excitation light, and wherein the interference layer system is effective to amplify excitation by reflection of light having a first wavelength and a discrete second wavelength, wherein interference of the first wavelength results in a doubling of the electric field amplitude of the first wavelength and in an excitation maximum in the region of the fluorescencable material, wherein interference of the discrete second wavelength results in an extinction of the electric field amplitude of the second wavelength and in an excitation minimum in the region of the fluorescencable material, and wherein the excitation maximum has a ratio to the excitation minimum of at least 5 to 1.