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Near-field imaging with terahertz (THz) waves is emerging as a powerful technique for fundamental research in photonics and across physical and life sciences. Spatial resolution beyond the diffraction limit can be achieved by collecting THz waves from an object through a small aperture placed in the near-field. However, light transmission through a sub-wavelength size aperture is fundamentally limited by the wave nature of light. Here, we conceive a novel architecture that exploits inherently strong evanescent THz field arising within the aperture to mitigate the problem of vanishing transmission. The sub-wavelength aperture is originally coupled to asymmetric electrodes, which activate the thermo-electric THz detection mechanism in a transistor channel made of flakes of black-phosphorus or InAs nanowires. The proposed novel THz near-field probes enable room-temperature sub-wavelength resolution coherent …
Nature Publishing Group
Publication date: 
13 Mar 2017

Oleg Mitrofanov, Leonardo Viti, Enrico Dardanis, Maria Caterina Giordano, Daniele Ercolani, Antonio Politano, Lucia Sorba, Miriam S Vitiello

Biblio References: 
Volume: 7 Pages: 44240
Scientific reports