Generation and detection of ultrashort pulses of electromagnetic field in the terahertz range and their application for spectroscopy

Ахмеджанов, Р. А.; Korytin, A. I.; Litvak, A. G.; Sergeev, A. M.; Суворов, Е. В.

doi:10.1007/s11141-006-0015-3

Cited by 6 publications

(2 citation statements)

References 12 publications

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“…Almost all of these applications are based on the THz time domain spectroscopy (THz-TDS) technology [1,2]. THz-TDS based on pump-probe scheme is a very promising coherent measurement technique for its unique time-resolved feature and high signal-to-noise ratio (SNR) at THz frequency.…”

Section: Introductionmentioning

confidence: 99%

“…However, at higher microwave and millimeter-wave frequencies, ohmic and dielectric losses associated with such a feed network as well as undesired feed radiation degrade their gain, sidelobe level, and crosspolarization [1]. On the other hand, waveguide-based antennas such as slotted waveguide antenna arrays have low loss and high efficiency at the expense of higher cost and more complicated fabrication [2]. Therefore, a combination of microstrip antenna elements and a waveguide feed circuitry can result in a low-cost and low-loss structure.…”

Section: Introductionmentioning

confidence: 99%

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Terahertz generation and detection setup based on pump‐probe scheme

Zhou

Chen

Feng

et al. 2009

Micro & Optical Tech Letters

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EDITORIALAs the editor of Microwave and Optical Technology Letters, I am very pleased to inform our readers of the tremendous increase in submissions over the past few years, which is an indication of the continually evolving nature of this field and the great interest and respect that this journal has worked hard to achieve.We strive to bring you, through our rapid publication schedule, the most up-to-date and noteworthy research while also upholding a high level of quality in the articles published. It is for that reason that we would like to announce that the rejection rate for Microwave and Optical Technology Letters has recently been increased to 60%, with the aim to increase it even higher in the future.By increasing the rejection rate our objective is to ensure that Microwave and Optical Technology Letters continues to publish the best communications in the fields of microwave and optical technologies, and retains its loyal reader and author base. ABSTRACT: A terahertz (THz) generation and detection setup based on pump-probe scheme is presented. THz pulses are generated and detected successfully using nonlinear optical rectification of high power femtosecond laser pulses and electro-optic sampling. 3 THz available spectrum range is obtained for the setup. The use of THz pulses for spectroscopy is tested by measuring the absorption spectrums of water in air and dry nitrogen, respectively. The measurement resultsshow the setup has a high potential of THz spectroscopy. ABSTRACT:In this article, a low-loss parallel-series feed structure using substrate integrated waveguide (SIW) technology for a singlelayer microstrip antenna array is presented. In addition to reduction of feed radiation, the feed network benefits from typical advantages of planar structures such as compactness, low cost, integrability, and massproducibility. A 2 ϫ 8 microstrip antenna array of size 109 mm ϫ 34 mm fed by the proposed SIW feed system is designed and fabricated. Measurements on the fabricated array verify a minimum gain of 17.5 dBi in the frequency range of 17.4 to 18 GHz.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Terahertz generation and detection setup based on pump‐probe scheme

Zhou

Chen

Feng

et al. 2009

Micro & Optical Tech Letters

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Plasma mechanisms of pulsed terahertz radiation generation

Ахмеджанов

Ilyakov

Миронов

et al. 2009

Radiophys Quantum El

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We present the results on generating terahertz radiation in the plasma of an optical discharge arising in the atmosphere during the focusing of femtosecond laser radiation. Different generation schemes related to focusing of the optical radiation by spherical and axicon lenses, with a constant electric field imposed on the laser spark region, as well as with the use of bichromatic laser radiation, are studied. Directivity patterns and polarization distributions of the terahertz radiation are analyzed in detail for different generation techniques. Comparison with the experimental results obtained by other research groups is given. Possible nonlinear mechanisms of the terahertz radiation generation are discussed.

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Studies on 2,4-DNT Mixtures Using Reflection Terahertz Time Domain Spectroscopy for Explosives Detection

Zhou¹,

Chen²,

Feng³

2009

Chinese Phys. Lett.

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Absorption spectra (0.2-1.8 THz) of the mixtures of explosive 2,4-DNT and polyethylene(PE) at different ratios are obtained using reflection terahertz time domain spectroscopy (THz-TDS). The pronounced absorption peak of 2,4-DNT at 1.08 THz is always observed for the mixtures with 2,4-DNT ratios above 20%. Experimental results demonstrate that more applicable and realistic THz-TDS in reflection geometry can be used to distinguish explosive mixed with other material having no THz fingerprints, and has a high potential in the detection of explosives.

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Generation and detection of ultrashort pulses of electromagnetic field in the terahertz range and their application for spectroscopy

Cited by 6 publications

References 12 publications

Terahertz generation and detection setup based on pump‐probe scheme

Terahertz generation and detection setup based on pump‐probe scheme

Plasma mechanisms of pulsed terahertz radiation generation

Studies on 2,4-DNT Mixtures Using Reflection Terahertz Time Domain Spectroscopy for Explosives Detection

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