2013
DOI: 10.1063/1.4836195
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Terahertz imaging of sub-wavelength particles with Zenneck surface waves

Abstract: Impact of sub-wavelength-size dielectric particles on Zenneck surface waves on planar metallic antennas is investigated at terahertz (THz) frequencies with THz near-field probe microscopy. Perturbations of the surface waves show the particle presence, despite its sub-wavelength size. The experimental configuration, which utilizes excitation of surface waves at metallic edges, is suitable for THz imaging of dielectric sub-wavelength size objects. As a proof of concept, the effects of a small strontium titanate … Show more

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Cited by 21 publications
(13 citation statements)
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“…These results account for the possibility to exploit our particles for efficient light manipulation from near‐UV up to near‐infrared frequencies, confirming the relevance of these spherical Titania‐based resonators so far limited to terahertz frequencies . The resonances found in experiments fairly agree with a very simple, analytical model for isolated perfect spheres predicting a red‐shift of the resonances and the appearance of multiple peaks at shorter wavelength featuring higher Q factors, when the radius increases.…”
Section: Resultssupporting
confidence: 78%
“…These results account for the possibility to exploit our particles for efficient light manipulation from near‐UV up to near‐infrared frequencies, confirming the relevance of these spherical Titania‐based resonators so far limited to terahertz frequencies . The resonances found in experiments fairly agree with a very simple, analytical model for isolated perfect spheres predicting a red‐shift of the resonances and the appearance of multiple peaks at shorter wavelength featuring higher Q factors, when the radius increases.…”
Section: Resultssupporting
confidence: 78%
“…Hence, our findings can lead to the spectroscopic characterization of an isolated nanoparticle, further invigorating the capabilities of SPP-microscopy techniques. Finally, it is straightforward to extend our work for THz SPPs, which have been recently exploited for time-resolved imaging of μm-particles [29].…”
Section: Introductionmentioning
confidence: 90%
“…To date, there is no calibrated procedure to characterize such enormously large fields. Established near-field measurements relying on electro-optic sampling [36,37], tunneling currents [38], or Franz-Keldysh oscillations [39] are not characterized for atomically strong fields in which even the concept of a rigid electronic band structure is pushed to the limits of its validity. Possible characterization methods may, however, arise from the following observations.…”
mentioning
confidence: 99%