A Terahertz Time-Domain Spectroscopy-Based Network Analyzer

Ramer, Jan-Martin; Freymann, Georg von

doi:10.1109/jlt.2015.2388954

Cited by 8 publications

(2 citation statements)

References 17 publications

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“…In a different approach, the resonance shift of THz semiconductor plasmonic antennas was used to sense dielectric and bacteria layers . However, these experiments rely on THz time domain spectroscopy, , which intrinsically offers high incident field intensities, but is cost intensive and more complex than conventional Fourier transform infrared (FTIR) spectroscopy. Additionally, all of these techniques rely on simply monitoring a change of the plasmonic resonance and are not suited to obtain the spectroscopic fingerprint of the investigated material.…”

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confidence: 99%

Wavelength Scaling in Antenna-Enhanced Infrared Spectroscopy: Toward the Far-IR and THz Region

Weber¹,

Nesterov²,

Weiß³

et al. 2016

ACS Photonics

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Weak vibrational signals in the infrared and terahertz spectral region can be enhanced by orders of magnitude when employing the electromagnetic near fields of plasmonic nanostructures. This approach is known as antenna-assisted surface-enhanced infrared absorption (SEIRA) and allows for a broad range of possible sensing applications. In the present work, we investigate the scaling of the SEIRA enhancement with wavelength, particularly toward the molecular fingerprint region (500−1500 cm −1 ). We apply the concept of SEIRA to perform resonant antenna-enhanced spectroscopy of molecules in a spectral range from 4.5 to 45 THz (6.7−67 μm wavelength, 150−1500 cm −1 ) using a standard Fourier transform infrared spectrometer. We fabricate arrays of rectangular gold antennas by electronbeam lithography and coat them with 30 nm thick layers of the fullerenes C 60 and C 70 , respectively. For the single digit THz measurements, we utilize spin-coated amino acids, particularly threonine. The resonances of the structures are tailored to spectrally match the molecular absorption features. An increased SEIRA enhancement of 2 orders of magnitude is found for antennas resonant at 6.7 THz when compared to 45 THz, corresponding to a λ 3 scaling over a frequency range of 1 order of magnitude. This scaling behavior is in excellent agreement with both numerical simulations and classical antenna theory. Further increase toward the single-digit THz region will yield the potential for ultrasensitive THz spectroscopy.

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confidence: 99%

Wavelength Scaling in Antenna-Enhanced Infrared Spectroscopy: Toward the Far-IR and THz Region

Weber¹,

Nesterov²,

Weiß³

et al. 2016

ACS Photonics

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“…Terahertz (THz) frequency electromagnetic (EM) fields have numerous applications ranging from wireless communications to imaging systems and nondestructive testing, to material characterization [1][2][3][4][5][6][7][8][9][10]. Despite the increasing interest in using THz EM fields in these applications, efficient THz source generation is still a fundamental challenge that limits the development of THz technologies.…”

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confidence: 99%

Analysis of Screening Effects on Terahertz Photoconductive Devices using a Fully-Coupled Multiphysics Approach

Chen,

Bagci

2021

Preprint

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The terahertz current generated by a photoconductive device (PCD) saturates as the power of the input optical pump is increased. This behavior is induced by various screening effects that stem from the interactions between electromagnetic (EM) fields and semiconductor carriers. In this work, these screening effects are numerically analyzed for the first time using a fullycoupled multiphysics approach. Unlike the previously developed simulation frameworks, this approach rigorously models the nonlinear coupling between the EM fields and the carriers and therefore is capable of accounting for the screening effects. It is demonstrated that the results obtained using this multiphysics approach and actual experiments are in excellent agreement. The optical-and radiation-field screening effects are identified in the simulation results and the optical-field screening is found to play a more dominant role in the saturation of the PCD output under high optical pump power levels.

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Coplanar stripline (CPS) emitter and transceiver microprobes for ultra-high bandwidth on-chip Terahertz measurements

Matheisen

Nagel

Sawallich

2015

2015 40th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

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A Terahertz Time-Domain Spectroscopy-Based Network Analyzer

Cited by 8 publications

References 17 publications

Wavelength Scaling in Antenna-Enhanced Infrared Spectroscopy: Toward the Far-IR and THz Region

Wavelength Scaling in Antenna-Enhanced Infrared Spectroscopy: Toward the Far-IR and THz Region

Analysis of Screening Effects on Terahertz Photoconductive Devices using a Fully-Coupled Multiphysics Approach

Coplanar stripline (CPS) emitter and transceiver microprobes for ultra-high bandwidth on-chip Terahertz measurements

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