Photoconductive antenna for terahertz waves, method for producing such photoconductive antenna and terahertz time domain spectroscopy system

A digitated photoconductive antenna (10) to generate and/or detect terahertz radiation (IG), the photoconductive antenna comprising a substrate (SB) made of a compound semiconductor, and comprising a plurality of digitated electrodes (DE) and two contact pads (CP) on the front face of the substrate (SB), characterized in that:

• it comprises a metallization layer (ML) being made on said front surface of the substrate (SB) for said digitated electrodes (DE) and said contact pads (CP),
• said digitated electrodes (DE) are equally spaced by a distance Δ, each digitated electrode being linked to another digitated electrode by a respective portion of said metallization layer called integrated resistance (IR) and presenting an intrinsic electrical resistance
• each contact pad is linked to a respective digitated electrode by a part (MP) of said metallization layer such that said contact pads are adapted to apply a voltage across said digitated electrodes wherein said digitated electrodes (DE) have a geometry such that they all present an identical polarity when said voltage is applied and wherein each integrated resistance is adapted to induce an electrical potential difference between the two electrodes it links when said voltage is applied such that the digitated photoconductive antenna (10) can generate and/or detect terahertz radiation.