Direct detection THz/sub-THz bolometer is proposed, in which electromagnetic wave propagates in the bipolar semiconductor waveguide, heats electrons and holes there, and therefore creates their excess concentrations, as well as electromotive force. Both the carrier excesses at the supplied voltage switching on and electromotive force cause the bolometer response voltage. Semiconductor lattice heating is absent, and the minimal response time equals to the charge carrier lifetime. A bolometer theoretical model is developed. The possibility without cooling or moderate cooling to get the noise equivalent power (NEP) less than that one in the existing direct detection detectors and even close to NEP of cryogenic coherent systems is the proposed bolometer important peculiarity. Experiments on the Cd_0.2Hg_0.8Te structures confirm the model main conclusions.

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