A novel scattering-type SNOM-tip featuring a micro-integrated bias-free optically driven terahertz pulse emitter

Nagel, M.; Sawallich, Simon; Michalski, Alexander; Schaffer, S.; Wigger, Anna Katharina; Bolívar, P. Haring

doi:10.1109/irmmw-thz46771.2020.9370894

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…With regard to radiation sources and detection, researchers employ free-space broadband TDS measurement systems [299,303,306,309,310], with the s-SNOM setup often implemented in such a way that pre-alignment is possible with the laser beam used for the generation of the THz pulses. In addition, integration of a photo-switch onto the AFM cantilever has been demonstrated for improved coupling to the tip [311]. Concerning narrow-band sources, most of the known coherent THz emitters seem to have been employed already, from large-scale devices, such as free-electron lasers [312,313] over molecular gas lasers [304,305,308,310], to compact sources, such as quantum cascade lasers [289,314] and electronic multiplier chains [315][316][317][318].…”

Section: Thz Nanoimaging and Nanoscopymentioning

confidence: 99%

Roadmap of Terahertz Imaging 2021

Valušis

Lisauskas

Yuan

et al. 2021

Sensors

193

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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

193

View full text Add to dashboard Cite

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Rough surface effect in terahertz near-field microscopy: 3D simulation analysis

Zhang²,

Peng

et al. 2023

Appl. Opt.

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Terahertz scattering-type scanning near-field optical microscopy (THz-s-SNOM) has emerged as a powerful technique for high-resolution imaging. However, most previous studies have focused on simplified smooth surface models, overlooking the realistic surface roughness induced by contamination during sample preparation. In this work, we present a novel 3D model, to the best of our knowledge, that combines the point dipole model with the finite element method to investigate the influence of sample morphology on scattered signals. We explore surfaces with a protrusion, a depression, and random roughness, characterizing the variations in scattered signals and highlighting the role of higher-order scattering in mitigating surface roughness effects. Our findings provide valuable insights into the impact of sample morphology on THz-s-SNOM imaging.

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A novel scattering-type SNOM-tip featuring a micro-integrated bias-free optically driven terahertz pulse emitter

Cited by 2 publications

References 4 publications

Roadmap of Terahertz Imaging 2021

Roadmap of Terahertz Imaging 2021

Rough surface effect in terahertz near-field microscopy: 3D simulation analysis

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