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THz trapped ion model and THz spectroscopy detection of potassium channels

Nano Research 2022年第4期15卷 3825-3833页

作者： Kaicheng Wang Shaomeng Wang Lixia Yang Zhe Wu Baoqing Zeng Yubin Gong School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 610054China School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China

Advanced molecular dynamics(MD)simulation and infrared(IR)spectroscopy have been widely adopted to reveal the detailed dynamic process of high-speed selective permeability of potassium channels.Yet these MD simulations cannot avoid the choice of empirical molecular force fields and high transmembrane voltages(as driving electric fields for ions)far exceeding physiological levels.Moreover,the IR spectroscopy method usually requires isotope labels for carbonyl groups of the channels,which may change the original permeation process.Here,we build the terahertz(THz)trapped ion model for the selectivity filter(SF)of potassium channels KcsA based on the density functional theory(DFT)calculation of ion potentials.In this model,the zero-point energy of trapped ions and quantum tunneling effect provide the physical basis for near diffusion limited permeation rates of ions and explain the high driving electric field in MD simulations.Quantitative calculations of zero-point energy and tunneling probability show that the quantum effect assisted knock-on mechanism may help to realize the physiological functions of potassium channels.Furthermore,based on the trapped ion model,we calculated the ion decoherence timescale under the influence of protein environmental noise.We use the quantum optics method to describe the interaction between THz waves and the trapped ion.Then the novel THz spectroscopy approaches through the THz resonance fluorescence and the intense field non-resonant effect are presented theoretically.These are expected to be isotope label-free detective methods of the rapid ion permeation dynamics.

关键词： potassium channels trapped ions zero-point energy quantum tunneling effect terahertz spectrum density functional theory(DFT)calculation

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Extraction of material parameters of a bi-layer structure using terahertz time-domain spectroscopy

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Science China(Information Sciences) 2014年第8期57卷 238-247页

作者： JIN BiaoBing ZHANG CaiHong SHEN XiaoFang MA JinLong CHEN Jian SHI ShengCai WU PeiHeng Research Institute of Superconductor Electronics (RISE) School of Electronic Science and EngineeringNanjing University Purple Mountain Observatory Chinese Academy of Sciences Graduate School of Chinese Academy of Sciences Chinese Academy of Sciences

For a bi-layer structure consisting of a film deposited on a substrate,a new extraction method is proposed using which we can extract both the material parameters of the film and the thickness of the substrate from the measured terahertz transmission through it,so long as the complex refractive index of the substrate is known beforehand.This method is applicable to a range of refractive indices of the film less than the refractive index of the substrate and a very wide range of layer thicknesses from 20μm to at least 200μm.It is very useful in some cases where the thickness of the substrate cannot be determined using conventional methods such as a Vernier caliper or micrometer screw.

关键词： material parameter terahertz spectrum extraction method anti-reflection coating layer THztime-domain spectroscopy

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