Multifrequency Digital Terahertz Holography Within 1.39–4.25 THz Range

Terahertz (THz) multifrequency digital holography within the range from 1.39–4.25 THz is demonstrated. Holograms are recorded using an optically pumped molecular THz laser operating at emission lines of 1.39-, 2.52-, 3.11-, and 4.25 THz frequencies, and nanometric field effect transistor with integrated patch antennae as a THz detector. It is revealed that phase-shifting methods allow for qualitative reconstruction of multifrequency THz holograms combined into one “colored” image. It provides more information about the low-absorbing objects with additionally improved quality achieved by removing unwanted information related to the so-called dc term and conjugated beam forming a virtual image. It is shown that the THz holography can be applied for the investigation of low-absorbing objects, and it is illustrated via inspection of stacked graphene layers placed on a high-resistivity silicon substrate.