  We analyze the modulation characteristics of the uncooled terahertz (THz) and
infrared (IR) detectors using the variation of the density and effective
temperature of the two-dimensional electron-hole plasma in uniform graphene
layers (GLs) and perforated graphene layers (PGLs) due to the absorption of THz
and IR radiation. The performance of the photodetectors (both the
GL-photoresistor and the PGL-based barrier photodiodes) are compared. Their
characteristics are also compared with the GL reverse-biased photodiodes. The
obtained results allow to evaluate the ultimate modulation frequencies of these
photodetectors and can be used for their optimization.
