HIGH-EFFICIENCY TERAHERTZ TRANSCEIVER ENABLING FREQUENCY MODULATION

摘要

The present invention relates to a high-efficiency THz receiver enabling frequency modulation. The high-efficiency THz receiver enabling frequency modulation according to the present invention comprises: an active layer; a photoconductive antenna positioned on the upper section of one side of the active layer; a nano grating antenna (NGA) formed on the photoconductive antenna; a semiconductor substrate positioned on the lower section of the other side of the active layer; and a surface plasmon coupler (SPC) positioned on the boundary surface between the substrate upper surface and the active layer, wherein the active layer is formed as an indium gallium arsenide (InGaAs) thin film or a dissimilar laminated thin film comprising an InGaAs/InAlAs multi-quantum well (MQW) layer, and the photoconductive antenna comprises: a parallel metal transmission line which extends in parallel at a certain length; central protrusions which protrude symmetrically so as to face inwardly at the central area of the parallel metal transmission line; and electrode pads which extend symmetrically on both ends of the parallel metal transmission line. The NGA is positioned on the central protrusions of the photoconductive antenna, and may have at least one pattern patterned and consecutively arranged thereon. The SPC may be positioned on the lower surface of the active layer, may have a plurality of patterns formed thereon by being periodically patterned so as to form a concentric circle, may have other forms of patterns, and may be formed of a metallic material. In addition, the high-efficiency THz receiver enabling frequency modulation according to the present invention is configured so as to be applied to a THz-wave receiver (Tx) or receiver (Rx) comprising discrete devices, or to be applied to a THz transceiver for generating and detecting a THz wave using a single photoconductive antenna on a single substrate and to be applied to a Tx and a Rx which are spaced at certain intervals and integrated on the single substrate, thereby being capable of transmitting and detecting the THz wave within the discrete devices or a single device. Due to said configuration, the high-efficiency THz receiver enabling frequency modulation according to the present invention can increase THz-wave generation and output and measurement sensitivity by integrating the NGA and the SPC. Simultaneously, the high-efficiency THz receiver is configured such that frequency can be modulated while the THz wave generated at a certain bandwidth passes through a surface plasmon resonance structure, thereby being able to have frequency selectivity.