ABSORBENT NANOSCALE STRUCTURE OF THE ASYMMETRIC MIM TYPE AND METHOD OF PRODUCING SUCH A STRUCTURE

摘要

According to one aspect, the invention relates to an asymmetric MIM type absorbent nanometric structure (1, 1') intended to receive a wide-band incident light wave the absorption of which is to be optimised within a given spectral band, comprising an absorbent dielectric layer (10) in said spectral band, of subwavelength thickness, arranged between a metal array (11) of subwavelength period and a metal reflector (12). The elements (110, 120) forming the metal array exhibit at least one dimension (w) suitable for forming a plasmonic resonator between the metal array and the metal reflector, under the elements of the array, which plasmonic resonator forms a Fabry-Pérot type longitudinal cavity resonating at a first wavelength of the aimed-for spectral absorption band, and the absorber layer exhibits, between the metal array and the metal reflector, at least one first thickness (ta) suitable for forming at least one first Fabry-Pérot type vertical cavity, resonating at a second wavelength of the aimed-for absorption spectral band.