Wide area array type photonic crystal photomixer for generating and detecting broadband terahertz wave

摘要

Provided is a broadband photomixer technology that is a core to generate continuous frequency variable and pulsed terahertz waves. It is possible to enhance light absorptance by applying the transmittance characteristic of a 2D light crystal structure and it is possible to increase the generation efficiency of terahertz waves accordingly. Moreover, it is possible to implement a wide area array type terahertz photomixer by applying an interdigit structure and spatially properly arranging a light crystal structure having various cycles. Accordingly, it is possible to solve difficulty in thermal characteristic and light alignment by mitigating the high light density of a light absorption unit and low photoelectric conversion efficiency is drastically improved. In addition, the radiation pattern of terahertz waves may be electrically controlled through the present invention.

主权项

1. A wide area array type photonic crystal photomixer comprising:
a sub photomixer array comprising: a plurality of first electrodes spaced apart from each other side by side and coupled to a bias voltage; a single one second electrode arranged between the first electrodes and coupled to a ground level; a first photonic crystal that is formed between one of the first electrodes and the one second electrode over a photoconductive layer formed on a substrate, the first photonic crystal including a plurality of first unit metal cell arrays arranged at preset distances from each other, the first unit metal cell arrays being formed so that the first photonic crystal is a light absorption area that transmits incident light; and a second photonic crystal that is formed between another of the first electrodes and the one second electrode over the photoconductive layer, the second photonic crystal including a plurality of second unit metal cell arrays arranged at preset distances from each other, the second unit metal cell arrays being formed so that the second photonic crystal is a light reflection area that reflects the incident light.