Far-infrared terahertz time-domain spectroscopy of flames

Cheville, R. A.; Grischkowsky, D.

doi:10.1364/ol.20.001646

Cited by 143 publications

(63 citation statements)

References 8 publications

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“…Right at the onset of this research, the spectroscopic applications were already being highlighted by Grischkowsky and coworkers in early work on characterizing semiconductor substrates, observing the rotational lines of a number of gases and measuring the spectra of flames. [26][27][28][29] Aside from PC generation and detection, another technique commonly employed in THz-TDS is electrooptic (EO) generation and detection. First demonstrated for femtosecond electrical transients by Auston and Nuss, 30 the technique was simultaneously demonstrated for the detection of free-space transients by three independent groups.…”

Section: Techniquesmentioning

confidence: 99%

Terahertz Time-Domain and Low-Frequency Raman Spectroscopy of Organic Materials

2015

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With the ongoing proliferation of terahertz time-domain instrumentation from semiconductor physics into applied spectroscopy over the past decade, measurements at terahertz frequencies (1 THz [ 10 12 Hz [ 33 cm À1) have attracted a sustained growing interest, in particular the investigation of hydrogen-bonding interactions in organic materials. More recently, the availability of Raman spectrometers that are readily able to measure in the equivalent spectral region very close to the elastic scattering background has also grown significantly. This development has led to renewed efforts in performing spectroscopy at the interface between dielectric relaxation phenomena and vibrational spectroscopy. In this review, we briefly outline the underlying technology, the physical phenomena governing the light-matter interaction at terahertz frequencies, recent examples of spectroscopic studies, and the current state of the art in assigning spectral features to vibrational modes based on computational techniques.

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Section: Techniquesmentioning

confidence: 99%

Terahertz Time-Domain and Low-Frequency Raman Spectroscopy of Organic Materials

2015

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“…However, in typical experimental arrangements, a large number of sampling events takes place, and this prevents phase-resolved detection of nonsynchronized THz signals. The inability to detect non-synchronized radiation can be an advantage when a strong background signal must be removed [10]. For example coherent THz detection can be used to probe the gain [11][12][13] of THz quantum cascade lasers (QCLs) [14] without detecting the non-synchronized laser emission of the QCL.…”

Section: Introductionmentioning

confidence: 99%

Measuring the sampling coherence of a terahertz quantum cascade laser

Maysonnave¹,

Jukam²,

Ibrahim³

et al. 2012

Opt. Express

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Abstract:The emission of a quantum cascade laser can be synchronized to the repetition rate of a femtosecond laser through the use of coherent injection seeding. This synchronization defines a sampling coherence between the terahertz laser emission and the femtosecond laser which enables coherent field detection. In this letter the sampling coherence is measured in the time-domain through the use of coherent and incoherent detection. For large seed amplitudes the emission is synchronized, while for small seed amplitudes the emission is non-synchronized. For intermediate seed amplitudes the emission exhibits a partial sampling coherence that is time-dependent. 211-212 (1982). 4. A. Nahata, A. S. Weling, and T. F. Heinz, "A wideband coherent terahertz spectroscopy system using optical rectification and electro-optic sampling," Appl. Phys. Lett. 69(16), 2321-2323 (1996). 5. J. Dai, X. Xie, and X. C. Zhang, "Detection of broadband terahertz waves with a laser-induced plasma in gases," Phys. Rev. Lett. 97(10), 103903 (2006). 6. D. H. Auston and K. P. Cheung, "Coherent time-domain far-infrared spectroscopy," J. Opt. Soc. Am. B 2(4), 606-612 (1985). 7. C. A. Schmuttenmaer, "Exploring dynamics in the far-infrared with terahertz spectroscopy," Chem. Rev. 104(4), 1759-1780 (2004). ©2012 Optical Society of America 41(3),

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“…Also the thermal background and electromagnetic noise can be filtered out very efficiently in this coherent detection scheme, thus enabling even measurements within hot flames. [19] …”

Section: à5mentioning

confidence: 99%

Terahertz Time‐Domain Spectroscopy of Gases, Liquids, and Solids

et al. 2011

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The techniques and methods employed in the spectroscopic characterization of gases, liquids, and solids in the terahertz frequency range are reviewed. Terahertz time-domain spectroscopy is applied to address a broadband frequency range between 100 GHz and 5 THz with a sub-10 GHz frequency resolution. The unique spectral absorption features measured can be efficiently used in material identification and sensing. Possibilities and limitations of fundamental and industrial applications are discussed.

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Far-infrared terahertz time-domain spectroscopy of flames

Cited by 143 publications

References 8 publications

Terahertz Time-Domain and Low-Frequency Raman Spectroscopy of Organic Materials

Terahertz Time-Domain and Low-Frequency Raman Spectroscopy of Organic Materials

Measuring the sampling coherence of a terahertz quantum cascade laser

Terahertz Time‐Domain Spectroscopy of Gases, Liquids, and Solids

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