Influence of the dielectric substrate on the terahertz electric near-field of a hole in a metal

Guestin, L.; Planken, Paul C. M.; Adam, A.J.L.

doi:10.1109/icimw.2010.5613021

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…The horizontal white dashed lines indicate the positions at which the x-y cross sections in Figure 4 were taken -30 nm below the probe aperture and 130 nm below the dipoles. Only the non-zero field components are plotted in the figure . The simulated profiles in this section are in agreement with results obtained for goldcoated tapered fiber tips [29], a planar Bethe aperture [30] and a hole in a metal film at THz frequencies [31].…”

Section: Correspondence Between the Fields Of The Hollow-pyramid Prob...supporting

confidence: 84%

A Near-Field Aperture-Probe as an Optical Magnetic Source and Detector

Denkova

2016

Springer Theses

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Scanning near-field field optical microscopy (SNOM) is a technique, which allows subwavelength optical imaging of photonic structures. While the electric field components of light can be routinely obtained, imaging of the magnetic components has only recently become of interest. This is so due to the development of artificial materials, which enhance and exploit the typically weak magnetic light-matter interactions to offer extraordinary optical properties. Consequently, both sources and detectors of the magnetic field of light are now required.In this paper, assisted by finite-difference time-domain simulations, we suggest that the circular aperture at the apex of a metal coated hollow-pyramid SNOM probe can be approximated by a lateral magnetic dipole source. This validates its use as a detector for the lateral magnetic near-field, as illustrated here for a plasmonic nanobar sample. Verification for a dielectric sample is currently in progress. We experimentally demonstrate the equivalence of the reciprocal configurations when the probe is used as a source (illumination mode) and as a detector (collection mode). The simplification of the probe to a simple magnetic dipole facilitates the simulations and the understanding of the near-field images.

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Section: Correspondence Between the Fields Of The Hollow-pyramid Prob...supporting

confidence: 84%

A Near-Field Aperture-Probe as an Optical Magnetic Source and Detector

Denkova

2016

Springer Theses

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“…Visualizing the near-field close to metallic microstructures with subwavelength spatial resolution provides a unique way to study their response to light. In recent studies THz near-field microscopy was used to characterize electromagnetic field transmission through subwavelength apertures [13][14][15][29][30][31] or the complex interaction of metamaterials with light [16,20].…”

Section: B Resonant Excitation Of a Metallic Microwirementioning

confidence: 99%

Terahertz near-field microscopy with subwavelength spatial resolution based on photoconductive antennas

2010

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Imaging and sensing applications based on pulsed terahertz radiation have opened new possibilities for scientific and industrial applications. Many exploit the unique features of the terahertz (THz) spectral region, where common packaging materials are transparent and many chemical compounds show characteristic absorptions. Because of their diffraction limit, THz far-field imaging techniques lack microscopic resolution and, if subwavelength features have to be resolved, near-field techniques are required. Here, we present a THz near-field microscopy approach based on photoconductive antennas as the THz emitter and as a near-field probe. Our system allows us to measure amplitude, phase, and polarization of the electric fields in the vicinity of a sample with a spatial resolution on the micrometer scale (approximately lambda/20). Using a dielectric (plant leaf) and a metallic structure (microwire) as examples, we demonstrate the capabilities of our approach.

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“…To date, a range of studies have already demonstrated the potential of THz near-field imaging for the investigation of optical near-fields close to metallic structures, such as small apertures [13][14][15][16][17], or microresonators and metamaterials [18][19][20][21][22]. Here, we extend the scope of this approach by demonstrating how particularly the intrinsic phase-sensitivity of pulsed THz nearfield microscopy can be utilized to analyze the formation and propagation of electromagnetic waves close to metal micro-structures.…”

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confidence: 93%

Electromagnetic Wave Propagation Close to Microstructures Studied by Time and Phase-Resolved THz Near-Field Imaging

Walther

Bitzer

2011

J Infrared Milli Terahz Waves

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We demonstrate microscopic mapping of electromagnetic waves close to metal microstructures with sub-ps temporal and sub-wavelength spatial resolution by pulsed THz near-field imaging. The inherent phasesensitivity of this technique allows mapping wavefronts of propagating modes and the measured amplitude distributions provide information on field concentration and localization close to the structures. Using this approach we investigate wave propagation through a sub-wavelength aperture, as well as the formation of traveling and standing surface waves along a metal microwire.

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Influence of the dielectric substrate on the terahertz electric near-field of a hole in a metal

Cited by 4 publications

References 9 publications

A Near-Field Aperture-Probe as an Optical Magnetic Source and Detector

A Near-Field Aperture-Probe as an Optical Magnetic Source and Detector

Terahertz near-field microscopy with subwavelength spatial resolution based on photoconductive antennas

Electromagnetic Wave Propagation Close to Microstructures Studied by Time and Phase-Resolved THz Near-Field Imaging

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