Design and dharacterization of resonant optical surface structures for extraordinary optical transmission and for color filter applications

Abstract

Metamaterials and metasurfaces with extraordinary optical properties which cannot be observed in natural materials can be obtained artificially by designing the basic structure of them. For effective design of this, deep understanding of their resonance characteristics is essential. In this thesis, resonant surface structures that operate in the visible and infrared region were designed based on resonance mode analysis. With dual resonance modes surface structures, a new concept of a plasmonic color filter using resonance modes for stopbands was suggested. The orthogonality of the dual resonance mode was appropriately selected for each RGB filters based of coupled-mode theory to obtain bright and vivid plasmonic color filter. And with the single resonance mode surface structure, working frequency of the extraordinary optical transmission was controlled by adjusting capacitance in an aperture. The capacitance was adjusted in two ways. One is to insert metal nanoparticles densely in an aperture and the other is to use a nanocomb structure. The resonance wavelength was shifted from 545 nm to maximum 2670 nm, and at 2670 nm, normalized transmission of structure embedded aperture is 37 times higher than that of clear aperture. For characterizing these resonant structures, quantitative phase imaging unit based diffraction phase imaging unit in infrared region was successfully designed and implemented. Amplitude information and phase information of both plane wave from simple thin film structure and vortex beam from tapered arc cyclic group symmetric metasurface were could be extracted using the measurement setup.