Ultrafast Energy Transfer to Liquid Water by Sub‐Picosecond High‐Intensity Terahertz Pulses: An Ab Initio Molecular Dynamics Study

Mishra, Pankaj Kr.; Vendrell, Oriol; Santra, Robin

doi:10.1002/ange.201305991

Cited by 1 publication

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“… 2 , 3 ). THz sources are considered to be more efficient due to direct coupling to the low frequency intermolecular modes of water 4 , 5 , providing spatially more uniform T-jumps 3 . Unfortunately, temperature estimations obtained for intensities on the order of are hard to apply to lower intensities of THz radiation typically used for cell exposure in life-science applications.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling and experimental verification of thermal effects in living cells exposed to high-power pulses of THz radiation

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Пронкин

Ilina

et al. 2021

Sci Rep

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Exposure of cells or biological tissues to high-power pulses of terahertz (THz) radiation leads to changes in a variety of intracellular processes. However, the role of heating effects due to strong absorption of THz radiation by water molecules still stays unclear. In this study, we performed numerical modelling in order to estimate the thermal impact on water of a single THz pulse as well as a series of THz pulses. A finite-element (FE) model that provides numerical solutions for the heat conduction equation is employed to compute the temperature increase. A simple expression for temperature estimation in the center of the spot of THz radiation is presented for given frequency and fluence of the THz pulse. It has been demonstrated that thermal effect is determined by either the average power of radiation or by the fluence of a single THz pulse depending on pulse repetition rate. Human dermal fibroblasts have been exposed to THz pulses (with an energy of $$15\,\upmu \hbox {J}$$ 15 μ J and repetition rate of 100 Hz) to estimate the thermal effect. Analysis of heat shock proteins expression has demonstrated no statistically significant difference ($$p < 0.05$$ p < 0.05 ) between control and experimental groups after 3 h of irradiation.

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