Abstract-Transmission Properties of FeCl3-Intercalated Graphene and WS2 Thin Films for Terahertz Time-Domain Spectroscopy Applications

Maria O. Zhukova, Benjamin T. Hogan, Egor N. Oparin, Polina S. Shaban, Yaroslav V. Grachev, Evgeniya Kovalska, Kieran K. Walsh, Monica F. Craciun, Anna Baldycheva and Anton N. Tcypkin

https://nanoscalereslett.springeropen.com/articles/10.1186/s11671-019-3062-3

Time-resolved terahertz spectroscopy has become a common method both for fundamental and applied studies focused on improving the quality of human life. However, the issue of finding materials applicable in these systems is still relevant. One of the appropriate solution is 2D materials. Here, we demonstrate the transmission properties of unique graphene-based structures with iron trichloride FeCl3 dopant on glass, sapphire and Kapton polyimide film substrates that previously were not investigated in the framework of the above-described problems in near infrared and THz ranges. We also show properties of a thin tungsten disulfide WS2 film fabricated from liquid crystal solutions transferred to a polyimide and polyethylene terephthalate substrates. The introduction of impurities, the selection of structural dimensions and the use of an appropriate substrate for modified 2D layered materials allow to control the transmission of samples for both the terahertz and infrared ranges, which can be used for creation of effective modulators and components for THz spectroscopy systems.

Abstract-Wireless Data Transmission Method Using Pulsed THz Sliced Spectral Supercontinuum

Yaroslav V. Grachev,  Xinrui Liu, Sergey E. Putilin,  Anton N. Tsypkin,   Victor G. Bespalov,  Sergei A. Kozlov, Xi-Cheng Zhang

https://ieeexplore.ieee.org/document/8119558/

A method of ultrafast wireless information transmission using spectrum-sliced supercontinuum (SC) along the THz frequency range is presented in this letter. The THz spectrum-sliced SC was formed by femtosecond optical pulses doubled in a Michelson interferometer before being input onto a MgO:LiNbO3-THz generator. Two THz pulses generated by femtosecond pulses within a MgO:LiNbO3-crystal provided the spectrum-sliced SC in the spectral domain, which was recorded by an electro-optical detection system. The transmission rate in this method is determined by the bandwidth of the THz spectrum, the number of spectral lines in the SC, and the pulse repetition rate. We have demonstrated an SC containing 31 spectral lines with 23-GHz spacing within the range from 0.04 to 0.75 THz. The signal with encoded information was successfully transmitted over 2.4 m in free-space.

Abstract-Wireless data transmission method using pulsed THz sliced spectral supercontinuum

 Yaroslav V. Grachev,  Xinrui Liu, Sergey E. Putilin, Anton N. Tsypkin,   Victor G. Bespalov,  Sergei A. Kozlov,   Xi-Cheng Zhang

http://ieeexplore.ieee.org/document/8119558/

A method of ultrafast wireless information transmission using spectrum-sliced supercontinuum (SC) along the THz frequency range is presented in this manuscript. The THz spectrum-sliced SC was formed by femtosecond optical pulses doubled in a Michelson interferometer before being input onto a MgO:LiNbO3 THz generator. Two THz pulses generated by femtosecond pulses within a MgO:LiNbO3 crystal provided the spectrum-sliced SC in the spectral domain, which was recorded by an electro-optical detection system. The transmission rate in this method is determined by the bandwidth of the THz spectrum, the number of spectral lines in the SC, and the pulse repetition rate. We have demonstrated a SC containing 31 spectral lines with 23 GHz spacing within the range from 0.04 to 0.75 THz. The signal with encoded information was successfully transmitted over 2.4 meters in free-space.

Abstract-The influence of period between U-shaped resonators on metasurface response at terahertz frequency range

Yurii E. Terekhov ; Mikhail K. Khodzitskiy ; Yaroslav V. Grachev ; Egor A. Sedykh ; Gennady V. Belokopytov ; Xi-Cheng Zhang

http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1739514

[-] Author Affiliations

Yurii E. Terekhov

Moscow State University (Russian Federation)

Mikhail K. Khodzitskiy

National Research Univ of ITMO (Russian Federation)

Yaroslav V. Grachev, Egor A. Sedykh

National Research Univ. of Information Technologies, Mechanics and Optics (Russian Federation)

Gennady V. Belokopytov

Lomonosov Moscow State Univ. (Russian Federation)

Xi-Cheng Zhang

The Institute of Optics, Univ. of Rochester (United States)

Proc. SPIE 8806, Metamaterials: Fundamentals and Applications VI, 88062Q (September 17, 2013); doi:10.1117/12.2024824

In this paper we study the influence of the period between U-shaped split-ring resonators (SRRs) on the trans- mission/absorbtion properties and refraction index of metasurfaces in THz frequency range (0.1 - 1 THz) using experiments and numerical simulations. The metasurfaces are formed by U-shaped SRRs arrays. The period varies from 63 to 300 μm The metasurface electromagnetic responses are obtained using terahertz time-domain spectroscopy. The experimental and numerical results reveal the shift in transmission spectra for the metasurface response and the tuning of absorbtion intensity at the period between U-shaped SRRs changing. The notable change in the metasurface refractive index is shown. © (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.