Scanning Near-Field Millimeter-Wave Microscope: Application to a Vector-Coding Technique

Benzaïm, O.; Haddadi, Kamel; Wang, M.M.; Maazi, M.; Glay, D.; Lasri, T.

doi:10.1109/tim.2008.926365

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…It should be mentioned that the microwave spectral region-due to the need for circuit diagnostics-has also seen much activity in the realm of near-field sensing techniques. The s-SNOM-related techniques applied there are known under the name Scanning near-Field Microwave Microscopy (SMM) [323,324]. Commercial products are available, e.g., from Keysight Technologies.…”

Section: Thz Nanoimaging and Nanoscopymentioning

confidence: 99%

Roadmap of Terahertz Imaging 2021

Valušis

Lisauskas

Yuan

et al. 2021

Sensors

178

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In this roadmap article, we have focused on the most recent advances in terahertz (THz) imaging with particular attention paid to the optimization and miniaturization of the THz imaging systems. Such systems entail enhanced functionality, reduced power consumption, and increased convenience, thus being geared toward the implementation of THz imaging systems in real operational conditions. The article will touch upon the advanced solid-state-based THz imaging systems, including room temperature THz sensors and arrays, as well as their on-chip integration with diffractive THz optical components. We will cover the current-state of compact room temperature THz emission sources, both optolectronic and electrically driven; particular emphasis is attributed to the beam-forming role in THz imaging, THz holography and spatial filtering, THz nano-imaging, and computational imaging. A number of advanced THz techniques, such as light-field THz imaging, homodyne spectroscopy, and phase sensitive spectrometry, THz modulated continuous wave imaging, room temperature THz frequency combs, and passive THz imaging, as well as the use of artificial intelligence in THz data processing and optics development, will be reviewed. This roadmap presents a structured snapshot of current advances in THz imaging as of 2021 and provides an opinion on contemporary scientific and technological challenges in this field, as well as extrapolations of possible further evolution in THz imaging.

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Section: Thz Nanoimaging and Nanoscopymentioning

confidence: 99%

Roadmap of Terahertz Imaging 2021

Valušis

Lisauskas

Yuan

et al. 2021

Sensors

178

View full text Add to dashboard Cite

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“…Attempts at coupling commercial s-SNOM with an mmW source have invariably failed, because the standard tip is too short (generally between 4-20 µm) to be used to enhance the localized electric field according to standard antenna theory [14], [15], whereas long tips suitable for enhancing mmW field cannot be used with currently available scanning probe microscopy (SPM) for imaging due to inherent configuration limits. To overcome this technical barrier, a variety of aperture based or apertureless near-filed tips/probes were developed, such as low-loss dielectric material sharpened pyramidal tip with a micron-sized plane facet [16], polymethylmethacrylate rectangular tapered probe with metal coating [17], quartz (dielectric) probes excited with a horn antenna [18], Teflon probe azimuthally patterned with several copper strips [19], and microfabricated resonant micro stripline probe [20]. However, none of them was capable of achieving a resolution better than 1 µm in the mmW region.…”

Section: Introductionmentioning

confidence: 99%

W-Band Near-Field Microscope

et al. 2019

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A home-built scattering-type scanning near-field millimeter-wave microscope based on a 110-GHz continuous-wave solid-state source is demonstrated with a spatial resolution of 1 µm, approximately 1/3000 of the incident wavelength, and a signal-to-noise ratio of 23.8 dB. The relationship between the length of the tip (antenna) and the wavelength for resonant enhancement, and the near-field distribution around the tip apex at different tip-sample separations were explored using finite-difference time-domain electromagnetic simulations to facilitate the design of the microscope. The dependence of the spatial resolution on the tip-sample separation and the harmonic order of the modulation frequency at which the near-field signal was extracted has been investigated experimentally and discussed in terms of the signal-tonoise ratio and the standard deviation of the demodulated signal. INDEX TERMS Millimeter wave, near-field, FDTD, high resolution, background noise.

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Sub-terahertz scanning near-field optical microscope using a quartz tuning fork based probe

Sun

Jin

et al. 2023

Opt. Express

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We report a sub-terahertz scattering-type scanning near-field microscope (sub-THz s-SNOM) which uses a 6 mm long metallic tip driven by a quartz tuning fork as the near-field probe. Under continuous-wave illumination by a 94 GHz Gunn diode oscillator, terahertz near-field images are obtained by demodulating the scattered wave at both the fundamental and the second harmonic of the tuning fork oscillation frequency together with the atomic-force-microscope (AFM) image. The terahertz near-field image of a gold grating with a period of 2.3 µm obtained at the fundamental modulation frequency agrees well with the AFM image. The experimental relationship between the signal demodulated at the fundamental frequency and the tip-sample distance is well fitted with the coupled dipole model indicating that the scattered signal from the long probe is mainly contributed by the near-field interaction between the tip and the sample. This near-filed probe scheme using quartz tuning fork can adjust the tip length flexibly to match the wavelength over the entire terahertz frequency range and allows for operation in cryogenic environment.

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Scanning Near-Field Millimeter-Wave Microscope: Application to a Vector-Coding Technique

Cited by 3 publications

References 14 publications

Roadmap of Terahertz Imaging 2021

Roadmap of Terahertz Imaging 2021

W-Band Near-Field Microscope

Sub-terahertz scanning near-field optical microscope using a quartz tuning fork based probe

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