GRAPHENE TRANSISTOR BASED ON METAMATERIAL STRUCTURE, OPTICAL DETECTOR, AND APPLICATION THEREOF

摘要

A graphene transistor based on a metamaterial structure, an optical detector, and an application thereof. The graphene transistor comprises a substrate (11), a gate metal layer (22), a gate medium layer (33), a graphene layer (44), and a metal layer of a source (55) and a drain (66) which are sequentially arranged from bottom to top. At least a part of the area of the metal layer of the source (55) and the drain (66) is provided with a periodic micro-nano structure. The periodic micro-nano structure, the gate metal layer (22), and the gate medium layer (33) match each other to form a metamaterial structure featuring complete absorption. By changing the refractive indexes, thickness, and the like of the materials of the periodic micro-nano structure and the gate medium layer, an optical absorption frequency band of the metamaterial structure can be adjusted. Due to the feature of perfect wavelength selective absorption, the metamaterial structure has higher sensitivity and narrow-band responses; the graphene transistor can work under visible light to infrared light or even light with longer wave bands by selecting different metamaterial structures; and by integrating optical detectors working in different wave bands, an image sensor, a spectrum detecting and analyzing device, and the like which can work in ultra-wide bands can be obtained.