Optical image edge detection by transmissive metal-dielectric-metal structures

The feasibility of an optical image edge detection based on metal-insulator-metal (MIM) resonance transmission structures is experimentally investigated. are fabricated a glass substrate and consist thin aluminum layers separated by quartz layer. excitation Fabry-Perot modes incident wave produces line shapes in angular wavelength spectra. Resonance enhancement suppression beams using the MIM can be implemented for suppressing illuminating beam amplifying field scattered object. By structure under oblique incidence, we observe efficient phase elements at set wavelengths. obtained images edges exhibit directionality that depends direction inhomogeneity gradient object plane, as suggested spectra structures. results present work find applications information processing filtering systems.