Broad Band-Pass and Band-Stop Transmissions Through the Hybrid Gratings of Rectangle and Triangle

Silver gratings of hybrid structures are proposed, and their optical transmission properties are simulated by finite element method. The proposed structure is found to facilitate a broadband-enhanced transmission in the infrared region and exerts a band-stop effect in the visible region. The effects of structural parameters on transmission characteristics are also studied. Results reveal promising applications in broadband light harvesting and filtering devices.