▎ 摘　　要

NOVELTY - The amplifier has a four-layer structure, a bottom layer is a metal substrate (1). The middle is a low refractive index medium (2). An upper layer is a high-refractive-index dielectric resonator element array (3) embedded in a low-refractive-index medium. The upper surface is close to graphene (4), which reflects and coherently amplifies terahertz waves of specific frequencies when pumped by high-power infrared lasers. USE - Terahertz amplifier based on optical pumping graphene-medium composite super-surface used in teraherz science technology field. ADVANTAGE - The structure of the terahertz amplifier is simple and compact, and provides high efficiency, high integration of the amplifying device for the terashertz system. The dynamic conductivity of graphene can be controlled as negative value by high power infrared laser pumping, using high Q resonance of high refractive index medium resonance unit to enhance the interaction of graphene and terashetz wave, realizing obvious terashene wave coherent amplification near the resonance frequency. The terahene wave amplifying frequency can be amplified at the low temperature of 77 K and at room temperature of 300 K, and the needed pumping intensity at the room temperature is higher than the order of magnitude at low temperature. The single-layer graphene fully uses high Q-resonance and low loss characteristics of the dielectric resonant unit array. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the terahertz amplifier based on optically pumped graphene-dielectric composite metasurface. (Drawing includes non-English language text). Metal substrate (1) Low refractive index medium (2) High-refractive-index dielectric resonator element array (3) Graphene (4)