THz near-field measurements of metal structures

Adam, A.J.L.; Brok, J.M.; Planken, Paul C. M.; Seo, Myung Hwan; Kim, Dai Sik

doi:10.1016/j.crhy.2007.07.005

Cited by 18 publications

(5 citation statements)

References 33 publications

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“…They show the propagation of the wave front for both components with a resolution of 20 μm and a bandwidth of 1.5 THz. They illustrate their technique by measuring the near-field of a metal sphere and of a single square hole in a metal foil [68].…”

Section: Direct Detection In the Near-fieldmentioning

confidence: 99%

Review of Near-Field Terahertz Measurement Methods and Their Applications

Adam

2011

J Infrared Milli Terahz Waves

203

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In the last decades, many research teams working at Terahertz frequencies focused their efforts on surpassing the diffraction limit. Numerous techniques have been investigated, combining methods existing at optic wavelength with THz system such as Time Domain Spectroscopy. The actual development led on one side to a resolution as high as λ/3000 and one the other side to a video-rate recording. The purpose of this paper is to give an overview of the history of the field, to describe the different approaches, to give examples of existing applications and to draw the perspective for this research area.

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Section: Direct Detection In the Near-fieldmentioning

confidence: 99%

Review of Near-Field Terahertz Measurement Methods and Their Applications

Adam

2011

J Infrared Milli Terahz Waves

203

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“…For this we use a near-field setup, capable of measuring all three components, E x , E y , and E z , of the electric near-field underneath the hole with a spatial resolution of about 10 μm. The setup is described in detail elsewhere [12,13] and is distinct from other setups used to measure the near-field in that the longitudinal field component is also measured [14,15]. The electric field of a THz pulse is incident on the hole from above.…”

Section: Frequency Dependencementioning

confidence: 99%

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

Guestin

Planken

Adam

2010

35th International Conference on Infrared, Millimeter, and Terahertz Waves

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Abstract:We have studied theoretically and experimentally the influence of a dielectric substrate on the frequency-dependent terahertz electric near-field of a small hole in a metal layer. We find that the near-field transmission spectrum and the two-dimensional field distribution of an empty hole in a thin metal layer on a substrate are almost identical to that of a hole which is also filled with the same dielectric material as the substrate. For thicker metal layers, however, the near-field spectra of filled and unfilled holes become very different. In addition, for thick metal layers, the two-dimensional field distributions are more strongly affected by the substrate, especially if we allow for an air gap between the metal and the substrate. Our results validate the -somewhat unusual-two-dimensional field distribution measured beneath a hole in a thick metal foil and highlight the effect that a substrate can have on the measurement of the near-field of an object.

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“…The sample could be then in contact with the detection crystal, leading to a direct measurement of the THz electric field in NF region. In [130], the deposition of various metal structures onto a gallium phosphite (GaP) crystal can improve the resolution by imaging at 20 µm.…”

Section: Tpi Near-field Systemsmentioning

confidence: 99%

THz Pulsed Imaging in Biomedical Applications

et al. 2020

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Recent advances in technology have allowed the production and the coherent detection of sub-ps pulses of terahertz (THz) radiation. Therefore, the potentialities of this technique have been readily recognized for THz spectroscopy and imaging in biomedicine. In particular, THz pulsed imaging (TPI) has rapidly increased its applications in the last decade. In this paper, we present a short review of TPI, discussing its basic principles and performances, and its state-of-the-art applications on biomedical systems.

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THz near-field measurements of metal structures

Cited by 18 publications

References 33 publications

Review of Near-Field Terahertz Measurement Methods and Their Applications

Review of Near-Field Terahertz Measurement Methods and Their Applications

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

THz Pulsed Imaging in Biomedical Applications

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