Terahertz (THz) signal is generated from 4-N, N-dimethylamino-4’-N’-methyl-stilbazolium tosylate (i.e. DAST Crystal) and Zinc telluride (ZnTe) nonlinear crystals by employing 140 fs laser pulses at 800 nm with 80 MHz repetition rate. The semi insulating gallium arsenide photoconductive stripline antennas (gap =5 µm, length = 20 µm) is used as a Terahertz detector. The detected temporal profile of Terahertz radiation generated from DAST crystal is high as compared to ZnTe crystal in terms of amplitude. THz effective bandwidths of these crystals are extended up to 1.1 THz range. The potential of THz generation of DAST and ZnTe crystals are evaluated with respect to incident laser power.

Evaluation of DAST and zinc telluride nonlinear crystals for efficient terahertz generation

The solution mixing approach-based cellulose nanocrystals (CNCs) decorated graphene oxide (GO) nanohybrids ([email protected]) was prepared and their effect over on the solventless polymer (SLP) called waterborne epoxy system was analyzed. The as-prepared GO, CNC and [email protected] were scrutinized by several characterization techniques such as X-ray diffraction (XRD), thermogravimetric analysis (TGA), Raman Analysis, Fourier transform infra-red (FT-IR), transmission electron microscopy (TEM) and field emission scanning electron microscope (FESEM) for identifying their quality. The GO-SLP, CNC-SLP and [email protected] nanocomposites mechanical and thermal properties were analyzed in detail. The highest tensile strength was observed at the lowest loading content (0.2 wt %) of [email protected] incorporated SLP nanocomposites, as compared with other (0.2 wt % of (GO-SLP and CNC-SLP)) nanocomposites. Also, the thermo-mechanical analysis of [email protected] nanohybrids incorporated SLP system exposes a notable improvement in the tan delta and storage modulus values at lower nanofiller concentration (0.2 wt %). The successful decoration of CNC on the GO surface promotes to the uniform dispersion, strong hydrogen bonding and outstanding interaction between the introduced nanofillers within the SLP system which leads to the better results in the mechanical and thermal properties. Besides, it was observed that the numerical simulation responses were in good deal with the laboratory values for both ultimate stress and strain. Thus, the as-prepared nanohybrids could possibly enrich the mechanical and thermal properties of the SLP system. 

Synergistic effect of cellulose nanocrystals-graphene oxide as an effective nanofiller for enhancing properties of solventless polymer nanocomposites

Applications of terahertz time-domain spectroscopy (THz-TDS) in the fields of chemistry and biomedicine have recently received increased attention. Specifically, THz-TDS is particularly effective for the identification of alkaloid molecules, because it can distinguish the vibration types of base molecules in the THz band and provide a direct characteristic spectrum for the configuration and conformation of biomolecules. However, when THz-TDS technology is used to identify alkaloid molecules, most of them are concentrated in the 0.1–3.0 THz band, limiting the amount of information that can be obtained. In this work, a wide-spectrum THz-TDS system was independently built to explore the absorption spectra of uracil and its 5-substituents in the range of 1.3–6.0 THz. We found that, in the THz band, uracil and its 5-substituents have similar absorption peaks near 4.9 and 3.3 THz, while the 5-substituents have an additional absorption peak in the range of 1.5–2.5 THz. This absorption peak is red-shifted as the relative atomic mass of the 5-substituted atoms increases. Gaussian software was adopted to calculate the absorption spectra of the samples. The simulation conclusions were in good agreement with the experimental results, revealing that the vibration of the base molecule at low frequencies can be attributed to the inter-molecular vibration. This work demonstrates that THz-TDS technology can be used to accurately identify biomolecules with similar molecular structures, reflecting the importance of molecular structure in biological activity.

Terahertz Spectral Properties of 5-Substituted Uracils

The generation of terahertz radiation in a BNA crystal pumped by 1.24-µm femtosecond laser radiation from a Cr:forsterite laser system with a pulse duration of 100 and 35 fs and a pump density of 10 mJ/cm 2 has been realized. The achieved generation efficiency is 0.1%. It is found that a decrease in the pump pulse duration from 100 to 35 fs leads to the generation of high-frequency components in the ranges of 2.5–6.5 THz and 9‒10.5 THz in the generated radiation spectrum. Simulation of the terahertz radiation generation based on the solution of Maxwell’s equations by the finite-difference time-domain method has made it possible to adequately describe the measured spectra. The generation of broadband high-frequency terahertz radiation in the BNA crystal pumped by the Cr:forsterite laser system allows one to consider this schematic as an alternative to sources based on the BNA crystal pumped by a Ti:sapphire laser system. 

High-Frequency Shift and Extension of the Terahertz Radiation Spectrum up to 10 THz During Optical Rectification of High-Power Few-Cycle Near-Infrared Femtosecond Pump Radiation in a BNA Crystal

In this work, numerical analysis has been carried out to study the tunable terahertz (THz) generation in DAST (4N, N-dimethylamino-4′-N′-methyl-stilbazoliumtoyslate) and BNA (N-Benzyl-2-Methyl-4-Nitroanaline) using difference frequency generation (DFG) between the two optical beams, which can be generated from dual signal wavelength optical parametric oscillator (DSW-OPO) pumped by a single suitable laser. By varying the input wavelengths in the range 1,300–1,450 nm we obtained 0.1–23 THz tunable THz frequency in DAST. For BNA crystal, we varied the input wavelength in the range 750–900 nm to get widely tunable output ranging from sub- THz to 30 THz. The output THz power at the 0.47 THz was 0.02 and 0.07 W in DAST and BNA respectively. Thus, BNA is considered to be more suitable for sub-THz generation. At higher THz frequencies DAST provides greater output power and hence DAST and BNA supplement the dips in THz power spectrum of each other. It was also found that the THz power was saturated beyond 36 and 45 mm at 2.14 and 1.67 THz in BNA while, at the same frequencies the THz power was saturated at 4 and 2 mm length of DAST crystal.

Comparative analysis of tunable terahertz generation in DAST and BNA using difference frequency mixing

Mechanical analysis of conductive polymer nanocomposite

In this work, numerical analysis was performed to study the effect of ± 1% systematic error in grating parameters of PPLN, leading to a deviation in THz emission angle.

Analysis of variation of THz emission angle in periodically poled lithium niobate

In this paper numerical analysis has been carried out to study the tunable terahertz (THz) generation in gallium phosphide using difference frequency generation. By varying the input wavelengths in the range 930-1030 nm we obtained 0.1-3 THz tunable THz frequency. Theoretical dependence of THz wave power on GaP crystal length and effect of simultaneous tuning of both the input wavelengths has been studied. The simulated values of THz peak power were 0.6 W, 0.7 W and 0.48 W which were obtained at 1.3, 2 and 2.7THz respectively

/pdf/analysis-of-tunable-terahertz-generation-in-gallium-45lj4lofbu.pdf

Analysis of Tunable Terahertz Generation in Gallium Phosphide Using Difference Frequency Mixing

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Comparative analysis of tunable terahertz generation in DAST and BNA using difference frequency mixing

Mechanical analysis of conductive polymer nanocomposite

Analysis of variation of THz emission angle in periodically poled lithium niobate

Analysis of Tunable Terahertz Generation in Gallium Phosphide Using Difference Frequency Mixing