Intense terahertz radiation: generation and application

Zhang, Yan; Li, Kaixuan; Zhao, Huajun

doi:10.1007/s12200-020-1052-9

Cited by 38 publications

(31 citation statements)

References 148 publications

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“…THz waves can penetrate a few inches thick foam. Foam used in space shuttle has very low refractive index and absorption variation, although this change can be observed to detect the defects [1][2][3][4][5][6][7][8][9][10].…”

Section: Non Damaging Testingmentioning

confidence: 99%

“…The atmospheric molecules (nitrogen, water, oxygen and carbon monoxide) have excitation energy in the terahertz range, therefore these molecules can be detected with THz radiation to monitor the atmospheric environmental and ozone layer as well as space research [3][4][5][6][7][8][9][10][11][12]. THz technology can be employed in astronomy and Earth observation to monitor the weather.…”

Section: Astronomy and Atmospheric Researchmentioning

confidence: 99%

“…THz band has higher frequency, wider bandwidth and greater channel than the microwave and 10 Gbps wi-fi transmission speeds may be obtained by means of THz communique, which is some hundred or maybe hundreds of instances faster than contemporary ultra-Wideband technology [3][4][5][6][7][8][9][10][11][12].…”

Section: Wireless Communication and Networkingmentioning

confidence: 99%

“…Terahertz radiation is very sensitive to molecules and surrounding environment. Therefore, terahertz technology is used in chemical detection and identifications of the chemical and biological agents [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Chemical and Biological Agent Detectionmentioning

confidence: 99%

See 3 more Smart Citations

Studies of Terahertz Sources and Their Applications

Singh¹,

Meena²,

Tyagi³

et al. 2022

Intelligent Electronics and Circuits - Terahertz, ITS, and Beyond

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The contributed chapter discuss the applications of terahertz radiations and its generation mechanism through laser plasma interactions. The methods of generation of terahertz radiations from plasma wake field acceleration, higher harmonic generation and the laser beat wave plasma frequency are reviewed. The nonlinear current density oscillate the plasma at beat wave frequency under the effect of ponderomotive force and excite the terahertz radiation at beat wave frequency. The current state of the arts of the methods of generation has been incorporated. The mathematical expression of ponderomotive force has been derived under the influence of gradient of laser fields. In additions, the future challenge and their overcomes are also been discussed.

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Section: Non Damaging Testingmentioning

confidence: 99%

Section: Astronomy and Atmospheric Researchmentioning

confidence: 99%

Section: Wireless Communication and Networkingmentioning

confidence: 99%

Section: Chemical and Biological Agent Detectionmentioning

confidence: 99%

See 2 more Smart Citations

Studies of Terahertz Sources and Their Applications

Singh¹,

Meena²,

Tyagi³

et al. 2022

Intelligent Electronics and Circuits - Terahertz, ITS, and Beyond

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“…THz radiation or T-ray includes a frequency range of 0.1-10 THz and an equivalent wavelength region of 30μm-3mm in the electromagnetic spectrum [2]. Many solids and molecules have distinct and strong spectral lines at THz frequencies that provide THz technology for both scientific and commercial applications in various fields such as biomedical imaging, non-invasive inspections, spectroscopy, and astronomy [3][4][5][6][7]. The generation of THz radiation is possible through various sources such as parametric oscillators [8], Gyrotrons [9,10], and four-wave mixing (FWM) [11] which unfortunately generate low average power.…”

mentioning

confidence: 99%

Terahertz Plasmonic Quantum Cascade Lasers: a Comprehensive Physics Study

Pakfetrat

Pakarzadeh

2022

Plasmonics

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Generation of terahertz (THz) radiation has been a hot research topic in recent years. Plasmonic quantum cascade lasers (QCLs) are among the most compact and efficient sources to generate THz radiation. In this paper, we comprehensively study plasmonic QCLs designed based on the antenna-feedback structure to generate efficient radiation about the center frequency of 3 THz. By changing the geometric structure of the plasmonic cavity and using two-dimensional simulation, a minimum loss less than 5.9 cm -1 is achieved at the lasing frequency. It is also possible to control the orientation of the output beam either vertically or tilted by changing the geometry of the antenna design via chirped or non-chirped grating scheme. Moreover, the output characteristics of the QCL are simulated based on the three-level rate equations through which the dynamics of the laser, as well as the P-I curve are investigated. Also, the gain spectra for two laser designs (with chirped and non-chirped gratings) are simulated and compared to each other. The results of this paper may provide deep insight into designing efficient laser sources in the THz region.

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All in One‐Chip, Electrolyte‐Gated Graphene Amplitude Modulator, Saturable Absorber Mirror and Metrological Frequency‐Tuner in the 2–5 THz Range

Gaspare

Pogna

Riccardi

et al. 2022

Advanced Optical Materials

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nication platforms [10,11] and quantum key distributions [10] has dramatically enhanced the quest for modulator technologies capable to enable data communications by means of all-optical devices and circuits, [12] across the visible and infrared (IR) ranges. Such a demand is actually extending also to the far-IR or terahertz (THz) frequency range of the electromagnetic spectrum (0.1-10 THz, 3000 -30 µm), an emerging frontier research field in quantum science.In this technologically appealing frequency domain, high-resolution spectroscopic systems for molecular sensing and metrology applications [13,14] might also highly benefit from the development of efficient, tunable modulators capable of amplitude, [1,2] frequency, [6] and phase stabilization [4,5] of miniaturized metrological sources, as the recently emerged quantum cascade laser (QCL) frequency combs (FCs). [15,16] QCLs can indeed support very high modulation rates (up to tens of GHz), [17,18] through direct modulation of their operating current, [19] although at the price of current instabilities, [20,21] or spurious amplitude and frequency self-modulation, [20,21] detrimental for quantum applications requiring a tight control of the optical phase and frequency jitter. Electro-optical modulators, possibly integrated on-chip, are therefore highly desirable in this context.In the last decade, different approaches, based on III-V semiconductors as silicon and gallium arsenide, or employing two-dimensional (2D) electron gas in AlGaAs/InGaAs heterostructures, have been adopted to devise THz-frequency modulators, with modulation speeds up to 14 GHz. [22] However, the high demand for fast (GHz modulation) and efficient (50% modulation efficiency) amplitude, frequency, and polarization modulators operating at room-temperature, is recently driving extensive research on 2D materials that can provide the required versatility and electrical/optical tunability needed for large-scale applications.Graphene, the most widely tested 2D material, display a large potential for the development of optoelectronic devices and components capable to actively manipulate IR light. [1,23] The optical conductivity of single layer graphene (SLG) [24,25] results from interband and intraband transitions between, or within, Layered 2D materials display unique optical and electrical properties that can enable manipulation, propagation, and detection of electromagnetic waves over a broad spectral range, with a high level of control, offering the potential to activate different functionalities, by optical or electrical means, in a single chip. Here, a compact optoelectronic device behaving as an amplitude modulator, saturable absorber mirror (SA mirror), and frequency-tuner is conceived at terahertz (THz) frequencies. It comprises a gate-tunable single layer graphene (SLG), embedded in a quarter-wave cavity, operating in the 1-5 THz range. The use of electrolyte ionic liquid gate ensures 40% optical amplitude modulation depth. Z-scan self-mixing interferometry reveals 60% reflectivity modulat...

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Intense terahertz radiation: generation and application

Cited by 38 publications

References 148 publications

Studies of Terahertz Sources and Their Applications

Studies of Terahertz Sources and Their Applications

Terahertz Plasmonic Quantum Cascade Lasers: a Comprehensive Physics Study

All in One‐Chip, Electrolyte‐Gated Graphene Amplitude Modulator, Saturable Absorber Mirror and Metrological Frequency‐Tuner in the 2–5 THz Range

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