Abstract
A versatile cw measurement setup for terahertz near-field reflectometry is proposed. Propagation, coupling, and focusing of wire guided modes are used to achieve a λ/33 resolution while imaging a metal corner deposited on glass. The setup is source and detector independent owing to wave coupling and decoupling with differential phase plates.
Highlights
Near-field imaging is a key technique for high-resolution imaging
This is especially valuable in the terahertz (THz) range where the very long wavelength has a disastrous influence of the far-field imaging resolution limit
Aiming at developing cw near-field imaging with versatile THz sources, we already showed the Sommerfeld waves (SW) excitation with a differential phase element (DPE) and the longitudinal field concentration and selectivity at the apex of a tapered needle [3]
Summary
Near-field imaging is a key technique for high-resolution imaging. This is especially valuable in the terahertz (THz) range where the very long wavelength has a disastrous influence of the far-field imaging resolution limit. By combining them with a Y-splitter (as initially proposed by Mittleman [4, 6]) and by connecting a metallic needle and two DPE at the three end facets of the systems (as shown in Fig. 1), we propose an original and versatile configuration that transposes cw reflection-mode scanning near-field microscope [7] to THz frequencies. Advantage to be coupled with external sources and detectors via linearly polarized freely propagating waves
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