Terahertz technologies: present and future

Nagatsuma, Tadao

doi:10.1587/elex.8.1127

Cited by 176 publications

(79 citation statements)

References 50 publications

(49 reference statements)

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“…[1][2][3] Compact and coherent solid-state sources are important components for these applications. Because the THz region is located between the light and millimeter waves, the THz sources are investigated with optical and electron devices.…”

Section: Introductionmentioning

confidence: 99%

Measurements of temperature characteristics and estimation of terahertz negative differential conductance in resonant-tunneling-diode oscillators

2017

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The temperature dependences of output power, oscillation frequency, and current-voltage curve are measured for resonant-tunneling-diode terahertz (THz) oscillators. The output power largely changes with temperature owing to the change in Ohmic loss. In contrast to the output power, the oscillation frequency and current-voltage curve are almost insensitive to temperature. The measured temperature dependence of output power is compared with the theoretical calculation including the negative differential conductance (NDC) as a fitting parameter assumed to be independent of temperature. Very good agreement was obtained between the measurement and calculation, and the NDC in the THz frequency region is estimated. The results show that the absolute values of NDC in the THz region significantly decrease relative to that at DC, and increases with increasing frequency in the measured frequency range.

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Section: Introductionmentioning

confidence: 99%

Measurements of temperature characteristics and estimation of terahertz negative differential conductance in resonant-tunneling-diode oscillators

2017

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“…In terahertz (THz) frequency (100 GHz∼10 THz) band, subharmonic mixers (SHMs) play a crucial role in heterodyne receivers due to the hardness in developing solid-state amplifiers at the current stage [1,2]. GaAs Schottky diodes are broadly used as the nonlinear elements in SHMs because of their low noise performance at room temperature [3,4].…”

Section: Introductionmentioning

confidence: 99%

Design of a low noise 190–240 GHz subharmonic mixer based on 3D geometric modeling of Schottky diodes and CAD load-pull techniques

Chen

Zhang

Yang

et al. 2016

IEICE Electron. Express

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This paper presents the design of a low noise Schottky-diode 190-240 GHz subharmonic mixer (SHM). The embedding impedance condition for the diodes to yield optimum circuit performance is primarily determined. It is achieved using the computer-aided design (CAD) load-pull techniques by taking into account the high-frequency parasitic effects caused by the diode chip geometry. By knowing this condition, the design procedure of the mixer circuitry is expedited. The design effectiveness of the proposed methodology is experimentally validated by the good agreement between the design predictions and the measured results of the mixer performance. Y-factor measurements show that the mixer exhibits the double side band (DSB) noise temperature lower than 1500 K and DSB conversion loss less than 10 dB over the 190-240 GHz frequency range, with the DSB noise temperature and conversion loss at 220 GHz of 800 K and 7 dB respectively.

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“…Applications in the terahertz (THz) range whose frequency is approximately from 0.1 to 3 THz have become increasingly common [1,2] since the development of THz time-domain spectroscopy (TDS) [3] in the 1980s. As a result, quantitative TDS measurements are required more than ever before.…”

Section: Introductionmentioning

confidence: 99%

Classification of terahertz spectrometer for transmittance measurements of refractive materials

Mizuno

Iida²,

Kinoshita³

et al. 2016

IEICE Electron. Express

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A comparison between commercially available transmission terahertz spectroscopy systems using photoconductive antennas owned by three participating institutions was performed to verify the effects of the specifications of each system on the transmittance measurement uncertainty. Three types of sample with different compositions and shapes were circulated around the participating institutions, and the data obtained from their systems were compared. We verified that sample thickness and its nonparallelism affected measurement data by carrying out measurements and calculations. On the basis of the components of variations in the measurement data, we tried to classify the five measurement data sets. The results indicated that the system users can easily compare their measurement conditions with those of other systems using statistical analysis.

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Terahertz technologies: present and future

Cited by 176 publications

References 50 publications

Measurements of temperature characteristics and estimation of terahertz negative differential conductance in resonant-tunneling-diode oscillators

Measurements of temperature characteristics and estimation of terahertz negative differential conductance in resonant-tunneling-diode oscillators

Design of a low noise 190–240 GHz subharmonic mixer based on 3D geometric modeling of Schottky diodes and CAD load-pull techniques

Classification of terahertz spectrometer for transmittance measurements of refractive materials

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