Accuracy of sample material parameters reconstruction using terahertz pulsed spectroscopy

Zaytsev, Kirill I.; Gavdush, A. A.; Karasik, Valeriy E.; Alekhnovich, V. I.; Nosov, P. A.; Lazarev, Vladimir A.; Reshetov, Igor V.; Yurchenko, Stanislav O.

doi:10.1063/1.4876324

Cited by 55 publications

(36 citation statements)

References 67 publications

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“…The applications also include the generation and detection processes based on dipole effects in two-dimensional semiconductor structures and graphene. [86][87][88] In addition, a series of sub-millimeter and THz devices, sources for THz pulsed spectroscopy 89 could be based on the discussed effect. Light localization effects are very important for spectroscopy and sensing applications because enhanced interaction of light and matter (gases, liquids, and solids) injected into the PC could be attained.…”

Section: Discussionmentioning

confidence: 98%

Band-gap nonlinear optical generation: The structure of internal optical field and the structural light focusing

Zaytsev

Katyba

Yakovlev

et al. 2014

Journal of Applied Physics

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A novel approach for the enhancement of nonlinear optical effects inside globular photonic crystals (PCs) is proposed and systematically studied via numerical simulations. The enhanced optical harmonic generation is associated with two- and three-dimensional PC pumping with the wavelength corresponding to different PC band-gaps. The interactions between light and the PC are numerically simulated using the finite-difference time-domain technique for solving the Maxwell's equations. Both empty and infiltrated two-dimensional PC structures are considered. A significant enhancement of harmonic generation is predicted owing to the highly efficient PC pumping based on the structural light focusing effect inside the PC structure. It is shown that a highly efficient harmonic generation could be attained for both the empty and infiltrated two- and three-dimensional PCs. We are demonstrating the ability for two times enhancement of the parametric decay efficiency, one order enhancement of the second harmonic generation, and two order enhancement of the third harmonic generation in PC structures in comparison to the nonlinear generations in appropriate homogenous media. Obviously, the nonlinear processes should be allowed by the molecular symmetry. The criteria of the nonlinear process efficiency are specified and calculated as a function of pumping wavelength position towards the PC globule diameter. Obtained criterion curves exhibit oscillating characteristics, which indicates that the highly efficient generation corresponds to the various PC band-gap pumping. The highest efficiency of nonlinear conversions could be reached for PC pumping with femtosecond optical pulses; thus, the local peak intensity would be maximized. Possible applications of the observed phenomenon are also discussed.

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Section: Discussionmentioning

confidence: 98%

Band-gap nonlinear optical generation: The structure of internal optical field and the structural light focusing

Zaytsev

Katyba

Yakovlev

et al. 2014

Journal of Applied Physics

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“…Moreover, as we all have involved in the scientific work at the University, we prepared lectures about our own research projects, concerning 3D-vision, 2 medical application of optical devices, 3-5 photonic crystals, 6-8 spectroscopy and its applications in various cases, [9][10][11][12][13][14] and fiber optics. For all of these seminars were explained the main results of the different studies.…”

Section: Activitiesmentioning

confidence: 99%

Summer school in Kabardino-Balkaria by BMSTU SPIE Student Chapter

et al. 2014

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This summer BMSTU SPIE Student Chapter have decided to visit Kabardino-Balkaria Republic of Caucasus (Russia) and spent there a week with children in a camp. It was called Summer School. We decided to organize it in order to engage talented and curious children in optics and photonics, and to show them how science could be for fun. Education and entertainment program included such activities as lectures, optical demonstrations, laser games, hiking in the forest, and others. As a result children had a good time outdoors, learned interesting facts and about optics and lasers, and of course found new friends who are keen to know more too. Four Chapter members and about 70 children of age 10-16 took part in this event.

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“…To examine the impact of the sample transfer function determination error on the reconstruction error for various numbers of satellite pulses , we implement the local linearization [28], [64] of the theoretical transfer function (5) (8) where is a complex coefficient of the local linearization. By calculating for typical experimental conditions (for simplicity, we assume, that and are the THz refractive index and absorption coefficient of the reference window at THz, mm is the thickness of this window, and and mm are the typical values of THz refractive index and absorption coefficient of the skin tissue in vivo at THz), we determine the dependence , which is presented in Fig.…”

Section: Reconstruction Of Thz Refractive Index and Absorption Cmentioning

confidence: 99%

“…The list of factors, which are inherent specifically to the proposed method, includes digital noise in the TPS waveforms, spectral inhomogeneity of the TPS sensitivity, and fluctuations of the reference window position, caused by movements of the sample in vivo. All these factors should be considered during solution of the inverse problem and estimation of the reconstruction error [28], [65].…”

Section: Reconstruction Of Thz Refractive Index and Absorption Cmentioning

confidence: 99%

Highly Accurate in Vivo Terahertz Spectroscopy of Healthy Skin: Variation of Refractive Index and Absorption Coefficient Along the Human Body

Zaytsev

Gavdush

Chernomyrdin

et al. 2015

IEEE Trans. THz Sci. Technol.

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A method to reconstruct the terahertz (THz) refractive index and absorption coefficient of in vivo tissue using THz pulsed spectroscopy (TPS) has been proposed. The method utilizes a reference THz window to fix the sample of interest during the TPS reflection mode measurements. Satellite pulses caused by multiple THz-wave reflections in the reference window are taken into account to accurately solve the inverse problem. The stability of the proposed method in the presence of various factors, including digital noise in the TPS waveforms and fluctuations of the reference THz window position, has been accurately analyzed. The method has been implemented to study in vivo the THz refractive index and absorption coefficient of the human skin. The skin from three persons has been measured, and the results agree with the well-known data on healthy skin spectroscopy in general, except for several regions of the skin. Thus, for the elbow, the hand, the knee, and the heel the THz refractive index and absorption coefficient considerably differ from the average values. The observed results are of principle importance for further development of novel approaches to skin diagnosis based on THz technologies.Index Terms-Absorption coefficient, inverse problem, material parameters, refractive index, spectroscopy of the skin, terahertz pulsed spectroscopy, THz technology.

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Accuracy of sample material parameters reconstruction using terahertz pulsed spectroscopy

Cited by 55 publications

References 67 publications

Band-gap nonlinear optical generation: The structure of internal optical field and the structural light focusing

Band-gap nonlinear optical generation: The structure of internal optical field and the structural light focusing

Summer school in Kabardino-Balkaria by BMSTU SPIE Student Chapter

Highly Accurate in Vivo Terahertz Spectroscopy of Healthy Skin: Variation of Refractive Index and Absorption Coefficient Along the Human Body

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