Terahertz dynamics in the glycerol-water system

Kölbel, Johanna; Schirmacher, Walter; Shalaev, Evgenyi; Zeitler, J. Axel

doi:10.1103/physrevb.107.104203

Cited by 11 publications

(12 citation statements)

References 80 publications

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“…In scientific research, it is mostly deployed to study low-energy dynamics in condensed matter using time-resolved spectroscopy. Some recent examples include the measurements of THz dynamics in glycol-water systems [1], ultrafast dynamics in topological antiferromagnets [2], or the non-linear conductivity response of graphene [3]. In addition to their use in fundamental studies, THz-TDS is increasingly used in industrial settings, where it is most popular for quality control, for example for non-contact thickness gauging of subwavelengths coatings [4] or water-proof textiles [5].…”

Section: Introductionmentioning

confidence: 99%

1030 nm Photoconductive Receiver excited at >20 mW of THz Average Power

Vogel

Mansourzadeh

Schulz

et al. 2022

Conference on Lasers and Electro-Optics

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Section: Introductionmentioning

confidence: 99%

1030 nm Photoconductive Receiver excited at >20 mW of THz Average Power

Vogel

Mansourzadeh

Schulz

et al. 2022

Conference on Lasers and Electro-Optics

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“…Given the propensity of hydrogen and van der Waals bonding interactions in solvated and lyophilized biopharmaceuticals, an ideal experimental method for studying such systems is terahertz time-domain spectroscopy (THz-TDS) due to the match in photon and bonding energies . In the terahertz range, the boson peak (BP) and the coupling of dipoles to the vibrational density of states dominate the absorption mechanisms . The motions at terahertz frequencies play an essential role in understanding solid-state protein dynamics.…”

mentioning

confidence: 99%

“…Utilizing THz-TDS, the onset temperature of molecular mobility, previously termed T g,β , was found to correlate with anharmonic effects in the model glass former glycerol. These anharmonic effects resulted in an apparent shift of the BP center frequency and could thus be separated from purely harmonic contributions …”

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confidence: 99%

“…Derivative parameter a can be utilized to characterize terahertz spectra at frequencies above and below the BP more reliably. It reflects the slope of the absorption spectra averaged over a specific frequency range …”

mentioning

confidence: 99%

“…In the spectral region that can be accessed with most terahertz spectrometers, between 0.3 and 3.0 THz (corresponding to the range between 10 and 100 cm –1 , respectively), frequency-dependent infrared absorption coefficient α(ω) is theoretically related to the reduced density of states g (ω) via g ( ω ) ω 2 ∝ α ( ω ) ω 3 . The boson peak (BP) refers to an excess in the density of states with respect to Debye’s g (ω) ∝ ω 2 law, which can appear as a peak in the reduced density of states.…”

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confidence: 99%

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Dynamical Transition in Dehydrated Proteins

Kölbel,

Anuschek,

Stelzl

et al. 2024

J. Phys. Chem. Lett.

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Terahertz time-domain spectroscopy and differential scanning calorimetry were used to study the role of the dynamics of biomolecules decoupled from solvent effects. Lyophilized sucrose exhibited steadily increasing absorption with temperature as anharmonic excitations commenced as the system emerged from a deep minimum of the potential energy landscape where harmonic vibrations dominate. The polypeptide bacitracin and two globular proteins, lysozyme and human serum albumin, showed a more complex temperature dependence. Further analysis focused on the spectral signature below and above the boson peak. We found evidence of the onset of anharmonic motions that are characteristic for partial unfolding and molecular jamming in the dry biomolecules. The activation of modes of the protein molecules at temperatures comparable to the protein dynamical transition temperature was observed in the absence of hydration. No evidence of Froḧlich coherence, postulated to facilitate biological function, was found in our experiments.

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Terahertz Sensing Based on Floating Bilayer Metasurface with Toroidal Dipole Resonance Toward Ultra‐High Sensitivity

Liu,

Xiao,

Qin

2024

Advanced Optical Materials

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Metasurface structures have proven to be effective in enhancing terahertz sensing signals and can thus be used as sensors to improve terahertz detection sensitivity. However, the sensitivity is limited by the poor spatial overlap between the analytes and the local electric field of the metasurface. In this work, a novel design of a floating bilayer metasurface structure for terahertz sensing is proposed and investigated. This structure supports a sharp toroidal dipole resonance and can concentrate near‐field energy on the analyte and metal atoms rather than on the substrate surface by floating the metal atoms. Consequently, the sensitivity is significantly improved to as high as 362 GHz RIU−1; theoretically, this is approximately 2.6 times higher than that of the common metasurface. The ability of the floating bilayer metasurface to quantitatively detect chlorothalonil is experimentally demonstrated. The resonance peak shows a significant frequency shift of 7 GHz for a change of 0.0001 mg dL−1 in chlorothalonil concentration, reaching up to 86 GHz when the change in chlorothalonil concentration is 100 mg dL−1; this is approximately 6.6 times higher than that of the common metasurface. This work provides opportunities for metasurface to realize ultrasensitive sensing in the terahertz regime.

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Terahertz dynamics in the glycerol-water system

Cited by 11 publications

References 80 publications

1030 nm Photoconductive Receiver excited at >20 mW of THz Average Power

1030 nm Photoconductive Receiver excited at >20 mW of THz Average Power

Dynamical Transition in Dehydrated Proteins

Terahertz Sensing Based on Floating Bilayer Metasurface with Toroidal Dipole Resonance Toward Ultra‐High Sensitivity

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