Abstract-Investigation of Water-free Biotissue-mimicking Phantoms in Terahertz Frequency Range

Tianmiao Zhang ; Mikhail K. Khodzitsky ; Petr S. Demchenko ; Alexander V. Bykov ;

https://ieeexplore.ieee.org/document/8510379

PVC-based water-free phantoms with silicon and zinc oxide nanoparticles were fabricated for mimicking biotissues in the terahertz frequency range. Terahertz time-domain spectroscopy (TDS) was used to obtain the refractive indices and absorption coefficients of the phantoms. Their optical properties were compared with those of real biotissues from published data. The results show that the phantoms are able to mimic human skin, paraffin-embedded glioma and paraffin-embedded healthy brain tissue by their optical properties. The refractive index of the phantoms can be controlled by changing the concentration of the nanoparticles.

Abstract-Epsilon-near-zero copper-dielectric composite for terahertz frequency range

Egor A. Litvinov,  Petr S. Demchenko,  Elizaveta B. Sheklanova,  Anna V. Vozianova,  Mikhail K. Khodzitsky,

https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10719/1071939/Epsilon-near-zero-copper-dielectric-composite-for-terahertz-frequency-range/10.1117/12.2326018.short

The work is dedicated to design of epsilon-near-zero metamaterials (ENZ) in terahertz frequency range. Two materials were investigated: the first material is the one-layered single-wire medium (SWM) and the second material consists of the planar parallel metal stripes on the layer of polyethylene terephthalate (PET). The wired medium was designed using analytical approximation of thin wire structures and verified by numerical simulations. The striped metamaterial was designed using numerical simulations software and its performance was experimentally verified by terahertz time-domain spectroscopy.

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Abstract-Time resolved terahertz spectroscopy of optically pumped multilayered graphene on silicon substrate

Alexandr N. Grebenchukov,  Anton D. Zaitsev,  Petr S. Demchenko,  Mikhail G. Novoselov,  Egor V. Kornilov,  Evgeniya O. Kovalska; Anna V. Baldycheva, Mikhail K. Khodzitsky

In this work, we study infrared optical pump-induced changes in terahertz conductivity of multi-layer graphene on a silicon substrate using terahertz time-domain spectroscopy. Results indicate that the conductivity and optical parameters of investigated material strongly depend on a pumping intensity and the presence of FeCl₃molecules intercalation. The findings are helpful for determining the most optically tunable material towards designing of optically controllable terahertz devices based on new two-dimensional material beyond graphene monolayer.

© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.