Terahertz endoscopy through laser-driven terahertz sources and detectors

A terahertz imaging system for endoscopy, comprising:

• a terahertz imager configured to receive terahertz image data comprising:
• a fiber bundle;
• at least one terahertz source configured to generate terahertz radiation, wherein each of the at least one terahertz source has an active area that can be illuminated by optical pump beams to generate the terahertz radiation;
• and
• at least one rotating element configured to reflect the generated terahertz radiation across scanned material;
• at least one terahertz detector configured to receive terahertz radiation reflected by the at least one rotating element, wherein each of the at least one terahertz detector has an active area that can be illuminated by optical probe beams to induce an output proportional to the received terahertz field;
• wherein the at least one terahertz source and detector are arranged in a two-dimensional array such that each terahertz detector is surrounded by a plurality of terahertz sources symmetrically;
• wherein the fiber bundle couples optical pump beams to the active area of the at least one terahertz source and optical probe beams to the active area of the at least one terahertz detector;
• and
• wherein the at least one terahertz source, at least one rotating element, and at least one terahertz detector are arranged in a catheter.