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Near-field imaging with terahertz (THz) waves is emerging as a powerfultechnique for fundamental research in photonics and across physical and lifesciences. Spatial resolution beyond the diffraction limit can be achieved bycollecting THz waves from an object through a small aperture placed in thenear-field. However, light transmission through a sub-wavelength size apertureis fundamentally limited by the wave nature of light. Here, we conceive a novelarchitecture that exploits inherently strong evanescent THz field arisingwithin the aperture to mitigate the problem of vanishing transmission. Thesub-wavelength aperture is originally coupled to asymmetric electrodes, whichactivate the thermo-electric THz detection mechanism in a transistor channelmade of flakes of black-phosphorus or InAs nanowires. The proposed novel THznear-field probes enable room-temperature sub-wavelength resolution coherentimaging with a 3.4 THz quantum cascade laser, paving the way to compact andversatile THz imaging systems and promising to bridge the gap in spatialresolution from the nanoscale to the diffraction limit.

Near-field terahertz probes with room-temperature nanodetectors for subwavelength resolution imaging