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

A wide area array type photonic crystal photomixer comprising:

• a sub photomixer array comprising:
• a plurality of first electrode spaced apart from each other side by side and coupled to a bias voltage;
• a second electrode arranged between the first electrodes and coupled to a ground level;
• a first photonic crystal that is formed between the upper one of the first electrodes and the second electrode over the photoconductive layer formed on a substrate and that includes a plurality of first unit metal cell arrays arranged at preset distances;
• and
• a second photonic crystal that is formed between the lower one of the first electrodes and the second electrode over the photoconductive layer and that includes a plurality of second unit metal cell arrays arranged at preset distances.

A method of manufacturing a photoconductive switch for a photomixer, the method comprising:

• forming a buffer layer on a substrate;
• forming a photoconductive layer on the buffer layer;
• forming a photonic crystal pattern including a plurality of unit metal cell arrays that are arranged at preset distances on the photoconductive layer;
• and
• forming first and second electrodes that electrically control light absorptance and light reflectivity on the photoconductive layer by the photonic crystal pattern.