A fiber-coupled photoconductive antenna (FCPA) is a type of optoelectronic device that combines a photoconductive antenna with optical fibers for the purpose of generating or detecting terahertz (THz) radiation. Let's break down the key components of the term:
Photoconductive antenna (PCA): This is a type of antenna that utilizes a photoconductive material. The material's electrical conductivity changes when exposed to light, typically in the terahertz range. When illuminated, the photoconductive material generates or detects terahertz radiation.
Fiber-coupled: The device is designed to be connected or integrated with optical fibers. Optical fibers are used to guide and transmit light signals. In the context of an FCPA, optical fibers are employed to deliver or collect light for the photoconductive process.
In summary, a fiber-coupled photoconductive antenna is an optoelectronic device that incorporates a photoconductive antenna and utilizes optical fibers to enable the transmission of light signals for the generation or detection of terahertz radiation. These devices find applications in terahertz spectroscopy, imaging, and communication systems. They are particularly useful in situations where the precise control and manipulation of terahertz waves are required.