Biological and chemical sensing with electronic THz techniques

Choi, Min Ki; Bettermann, Alan D.; Weide, Daniel W. van der

doi:10.1117/12.518462

Cited by 12 publications

(8 citation statements)

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“…Terahertz spectroscopy of molecular solids, in particular, has gained significant attention as it offers the possibility of distinguishing between different solid forms based on the signature of intermolecular vibrations [ 1 – 8 ]. For example, terahertz spectroscopy has been used to distinguish between different polymorphs of molecular solids used for pharmaceutical purposes [ 4 – 5 9 – 11 ], to detect contamination in food [ 12 ], in genetic [ 13 ] and skin-cancer [ 14 ] diagnosis, and in other applications [ 1 – 2 4 – 7 ].…”

Section: Introductionmentioning

confidence: 99%

Terahertz spectroscopy of 2,4,6-trinitrotoluene molecular solids from first principles

Azuri¹,

Hirsch²,

Reilly³

et al. 2018

Beilstein J. Org. Chem.

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We present a computational analysis of the terahertz spectra of the monoclinic and the orthorhombic polymorphs of 2,4,6-trinitrotoluene. Very good agreement with experimental data is found when using density functional theory that includes Tkatchenko–Scheffler pair-wise dispersion interactions. Furthermore, we show that for these polymorphs the theoretical results are only weakly affected by many-body dispersion contributions. The absence of dispersion interactions, however, causes sizable shifts in vibrational frequencies and directly affects the spatial character of the vibrational modes. Mode assignment allows for a distinction between the contributions of the monoclinic and orthorhombic polymorphs and shows that modes in the range from 0 to ca. 3.3 THz comprise both inter- and intramolecular vibrations, with the former dominating below ca. 1.5 THz. We also find that intramolecular contributions primarily involve the nitro and methyl groups. Finally, we present a prediction for the terahertz spectrum of 1,3,5-trinitrobenzene, showing that a modest chemical change leads to a markedly different terahertz spectrum.

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Section: Introductionmentioning

confidence: 99%

Terahertz spectroscopy of 2,4,6-trinitrotoluene molecular solids from first principles

Azuri¹,

Hirsch²,

Reilly³

et al. 2018

Beilstein J. Org. Chem.

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“…These devices will potentially combine THz capabilities and vast deployment opportunities that will benefit high-data-rate and secure broadband communications, radar applications, THz metrology, medical diagnostics, and electronic warfare/countermeasures. ,− Additionally, self-assembled SWSs are promising a platform to investigate and understand beam–wave interaction at THz frequencies and in devices with microscale cross sections, electromagnetic mode competition and mode control in suspended helices, and heat transport in microscale helical conductors.…”

Section: Discussionmentioning

confidence: 99%

Self-Winding Helices as Slow-Wave Structures for Sub-Millimeter Traveling-Wave Tubes

et al. 2020

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We present a transformative route to obtain mass-producible helical slow-wave structures for operation in beam−wave interaction devices at THz frequencies. The approach relies on guided self-assembly of conductive nanomembranes. Our work coordinates simulations of cold helices (i.e., helices with no electron beam) and hot helices (i.e., helices that interact with an electron beam). The theoretical study determines electromagnetic fields, current distributions, and beam− wave interaction in a parameter space that has not been explored before. These parameters include microscale diameter, pitch, tape width, and nanoscale surface finish. Parametric simulations show that beam−wave interaction devices based on selfassembled and electroplated helices will potentially provide gain-bandwidth products higher than 2 dBTHz at 1 THz. Informed by the simulation results, we fabricate prototype helices for operation as slow-wave structures at THz frequencies, using metal nanomembranes. Single and intertwined double helices, as well as helices with one or two chiralities, are obtained by selfassembly of stressed metal bilayers. The nanomembrane stiffness and built-in stress control the diameter of the helices. The inplane geometry of the nanomembrane determines the pitch, the chirality, and the formation of single vs intertwined double helices.

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“…Long lines for security screening at airports only underline the need for quick, reliable and safe personal screening. Because terahertz radiation has a low photon energy and is non-ionizing, it presents a suitable option for non-invasive imaging of humans, offering the possibility to screen for and locate concealed objects or materials [30], [31], [32] and [33]. Moreover, terahertz cameras with focal-plane arrays can be used to read letters in unopened envelopes as images of objects can be obtained regardless of the background illumination.…”

Section: Security Applicationsmentioning

confidence: 99%

Terahertz spectroscopy: The renaissance of far infrared spectroscopy

Mantsch

Naumann

2010

Journal of Molecular Structure

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Biological and chemical sensing with electronic THz techniques

Cited by 12 publications

References 1 publication

Terahertz spectroscopy of 2,4,6-trinitrotoluene molecular solids from first principles

Terahertz spectroscopy of 2,4,6-trinitrotoluene molecular solids from first principles

Self-Winding Helices as Slow-Wave Structures for Sub-Millimeter Traveling-Wave Tubes

Terahertz spectroscopy: The renaissance of far infrared spectroscopy

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