Journal of Quantitative Spectroscopy & Radiative Transfer最新文献_第7页

Investigation of the radiative characteristics of an oil-covered rough sea surface using a modified wave spectrum model 用修正波谱模型研究油覆盖粗糙海面的辐射特性

IF 1.9 3区物理与天体物理 Q2 OPTICS

Journal of Quantitative Spectroscopy & Radiative Transfer

Pub Date : 2025-12-04 DOI: 10.1016/j.jqsrt.2025.109784

Haojiang Chen , Qingzhi Lai , Min Wang , Yinmo Xie , Lanxin Ma , Jianyu Tan

Random waves on the surface of oil spills on the sea occur due to various factors, including sea breezes, which have a notable influence on the radiative characteristics of the oil spills. Accurately determining the effect of complex sea states on the radiative characteristics of oil spills is crucial for enhancing the accuracy of oil-spill monitoring. This study proposes a modified wave spectrum model incorporating Marangoni effect corrections to model rough oil-spill surfaces in complex sea states. Based on this, a radiative transfer model using the Monte Carlo method was developed to investigate the radiative characteristics of oil-spill and oil-free surfaces under varying wind speeds. The findings demonstrate that the surface roughness of oil spills is significantly lower than that of oil-free surfaces at identical wind speeds. This phenomenon is attributed to the higher viscosity of crude oil compared with that of seawater. Such disparities in the surface roughness leads to distinct variations in the spectral characteristics of reflectance. Neglecting these differences may result in inaccurate results. When employing the ELFOUHAILY wave spectrum model at a wind speed of 3 m/s, the mean relative error in reflectance was recorded as 1.15 %. This error increased with wind speed; at 15 m/s, the error increased to 8.2 %. As the wavelength increased, the reflectance of the oil spills decreased. Significant reflectance peaks were observed at 1760 nm and 1920 nm range. An oil-seawater contrast analysis, coupled with an evaluation of the effects of atmospheric absorption bands, indicated that the 1760 nm band was the most effective for detecting oil spills.

海面上溢油表面的随机波受海风等多种因素的影响，对溢油的辐射特性有显著影响。准确确定复杂海况对溢油辐射特性的影响，对于提高溢油监测的准确性至关重要。本研究提出了一种结合Marangoni效应修正的波浪谱模型来模拟复杂海况下的粗糙溢油面。在此基础上，建立了基于蒙特卡罗方法的辐射传输模型，研究了不同风速下溢油和无油表面的辐射特性。结果表明，在相同风速下，浮油表面粗糙度明显低于无油表面粗糙度。这种现象是由于原油的粘度比海水高。这种表面粗糙度的差异导致了反射率光谱特征的明显变化。忽略这些差异可能会导致不准确的结果。当风速为3 m/s时，ELFOUHAILY波谱模型的平均反射率相对误差为1.15%。该误差随风速增大而增大；在15 m/s时，误差增加到8.2%。随着波长的增加，溢油的反射率降低。在1760 nm和1920 nm处观察到显著的反射峰。油-海水对比分析以及大气吸收波段的效果评价表明，1760 nm波段是检测漏油最有效的波段。

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引用次数: 0

Multiscale modeling of the high-temperature radiative properties of ceria ceramics under thermochemical redox conditions 热化学氧化还原条件下铈陶瓷高温辐射特性的多尺度模拟

IF 1.9 3区物理与天体物理 Q2 OPTICS

Journal of Quantitative Spectroscopy & Radiative Transfer

Pub Date : 2025-12-03 DOI: 10.1016/j.jqsrt.2025.109783

Léo Gaillard , Pierre-Marie Geffroy , Abderezak Aouali , Benoit Rousseau

A multiscale modeling approach is proposed to determine the normal spectral emissivity of a 1.92 mm thick and 98% dense cerium oxide ceramic containing a small amount of micron size pores. The model is based on measurements of the electrical conductivity of the ceramic for the thermal operating regime set by the actual solar thermochemical production of H

_{2}

, i.e. from 900 to 1500 °C at a oxygen partial pressure of 10⁻⁵ atm. From a radiative point of view, the ceramic is defined as the volumetric distribution of spherical pores in a set of grains forming a radiatively homogeneous and continuous matrix. Room temperature normal hemispherical reflectance and transmittance measurements give analytically the scattering coefficient of this absorbing and scattering medium, considered independent from the temperature, using the modified two-flux approximation. The absorption coefficient is given at a fixed temperature and atmosphere by a semi-quantum Drude-Lorentz model whose parameters are derived from electrical conductivity measurements. The combination of both coefficients allow to determine critical optical thickness of the sample depending on the temperature, and to model emissivity. The multiscale model predicts the increase of an emissivity plateau between 2500 and 20000 cm⁻¹ with the temperature, going from 0.70 at 900 °C to 0.84 at 1500 °C, higher than the value of 0.20 measured at room temperature.

提出了一种多尺度建模方法来确定含有少量微米孔的1.92 mm厚98%密度氧化铈陶瓷的法向光谱发射率。该模型基于实际太阳能热化学生产H2所设定的热操作状态下陶瓷的电导率的测量，即在氧气分压为10 - 5 atm的情况下，从900°C到1500°C。从辐射的角度来看，陶瓷被定义为一组颗粒中球形孔的体积分布，形成辐射均匀和连续的基体。室温法向半球反射率和透射率测量用改进的双通量近似给出了这种吸收和散射介质的散射系数，认为与温度无关。在固定的温度和大气条件下，吸收系数由半量子德鲁德-洛伦兹模型给出，该模型的参数由电导率测量得出。这两个系数的组合允许根据温度确定样品的临界光学厚度，并模拟发射率。多尺度模型预测，随着温度的升高，发射率平台在2500 ~ 20000 cm−1之间增加，从900℃时的0.70增加到1500℃时的0.84，高于室温下测得的0.20。

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引用次数: 0

Rotational spectrum and hyperfine structure of the (para)-NH3–(ortho)-H2 van der Waals molecular complex （对）- nh3 -（邻位）- h2范德华分子络合物的旋转光谱和超精细结构

IF 1.9 3区物理与天体物理 Q2 OPTICS

Journal of Quantitative Spectroscopy & Radiative Transfer

Pub Date : 2025-12-02 DOI: 10.1016/j.jqsrt.2025.109781

Ivan V. Tarabukin , Denis G. Poydashev , Leonid A. Surin

The hyperfine structure of the (para)-NH₃–(ortho)-H₂ van der Waals molecular complex has been observed and analyzed for the first time. The measurements of the pure rotational transitions were carried out in the frequency range of 75-190 GHz using a newly developed millimeter-wave jet spectrometer with a molecular beam aligned coaxially with the direction of millimeter-waves propagation. ¹⁴N nuclear quadrupole coupling constant of NH₃, spin-spin and spin-rotation interaction constants of the two protons of the H₂ molecule were determined for (para)-NH₃–(ortho)-H₂ in its ground Π state. The obtained parameters contain useful information about angular orientation of the NH₃ and H₂ monomers within the van der Waals complex and provide an additional tool for evaluating the quality of the NH₃–H₂ interaction potential. The latter determines the reliability of the calculated excitation and de-excitation rates of ammonia during collisions with hydrogen in the dense interstellar clouds.

首次对（对）- nh3 -（邻位）- h2范德华分子络合物的超精细结构进行了观察和分析。在75 ~ 190ghz的频率范围内，利用新研制的毫米波射流光谱仪进行了纯旋转跃迁的测量，分子束与毫米波传播方向同轴。测定了H2分子(para)-NH3 -（邻位）-H2在Π基态下的14N核四极耦合常数、自旋-自旋和自旋-自旋相互作用常数。得到的参数包含了范德华络合物中NH3和H2单体的角取向的有用信息，并为评价NH3 - H2相互作用势的质量提供了额外的工具。后者决定了氨在稠密星际云中与氢碰撞时的激发和去激发率计算的可靠性。

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引用次数: 0

Hf12+ ion: Highly charged ion for next-generation atomic clocks and tests of fundamental physics Hf 12 +离子：用于下一代原子钟和基础物理测试的高电荷离子

IF 1.9 3区物理与天体物理 Q2 OPTICS

Journal of Quantitative Spectroscopy & Radiative Transfer

Pub Date : 2025-12-02 DOI: 10.1016/j.jqsrt.2025.109782

Saleh O. Allehabi , V.A. Dzuba , V.V. Flambaum

We use advanced computational techniques to study the electronic structure of the Hf

^{12 +}

ion, with the goal of assessing its potential for use in highly accurate atomic optical clocks and in the search for new physics. Such clocks should combine low sensitivity to external perturbations with high sensitivity to a possible time variation of the fine-structure constant

α

. The system features two clock transitions. One is an

f - p

transition in terms of single-electron states, which exhibits strong sensitivity to variations in

α

. The other is an electric-quadrupole (E2) transition between states of the ground-state configuration, which can serve as an anchor transition for measuring one frequency against the other.

All three relevant states possess very small and nearly equal static dipole polarizabilities, resulting in an extremely small blackbody-radiation shift. The quadrupole shift is also small and can be further suppressed. Altogether, Hf

^{12 +}

appears to be a highly promising candidate for both precision timekeeping and searches for new physics.

我们使用先进的计算技术来研究Hf12+离子的电子结构，目的是评估其在高精度原子光学钟和寻找新物理学中的应用潜力。这种时钟应该结合对外部扰动的低灵敏度和对精细结构常数α可能的时间变化的高灵敏度。该系统具有两个时钟转换。一种是单电子态的f - p跃迁，它对α的变化表现出很强的敏感性。另一种是基态结构状态之间的电四极（E2）跃迁，它可以作为测量一个频率对另一个频率的锚定跃迁。所有三种相关状态都具有非常小且几乎相等的静态偶极极化率，从而导致极小的黑体辐射位移。四极位移也很小，可以进一步抑制。总之，Hf12+似乎是精密计时和寻找新物理的极有希望的候选者。

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引用次数: 0

Multi-faceted light pollution modelling and its application to the decline of artificial illuminance in France 多面光污染模型及其在法国人工照度下降中的应用

IF 1.9 3区物理与天体物理 Q2 OPTICS

Journal of Quantitative Spectroscopy & Radiative Transfer

Pub Date : 2025-11-29 DOI: 10.1016/j.jqsrt.2025.109778

Rolf Buhler, Philippe Deverchère, Christophe Plotard, Sébastien Vauclair

Artificial Light At Night (ALAN) has been increasing steadily over the past century, particularly during the last decade. This leads to rising light pollution, which is known to have adverse effects on living organisms, including humans. We present a new software package to model light pollution from ground radiance measurements. The software is called Otus 3 and incorporates innovative ALAN diffusion models with different atmospheric profiles, cloud covers and urban emission functions. To date, light pollution modelling typically focused on calculating the zenith luminance of the skyglow produced by city lights. In Otus 3 we extend this and additionally model the horizontal illuminance on the ground, including the contributions from skyglow and the direct illumination. We applied Otus 3 to France using ground radiance data from the Visible Infrared Imaging Radiometer Suite (VIIRS). We calibrated our models using precise sky brightness measurements we obtained over 6 years at 139 different locations and make this dataset publicly available. We produced the first artificial illuminance map for France for the periods of 2013–2018 and 2019–2024. We found that the artificial ground illuminance in the middle of the night decreased by 23% between these two periods, in stark contrast to the global trend.

在过去的一个世纪里，特别是在过去的十年里，夜间人工照明（ALAN）一直在稳步增长。这导致了日益严重的光污染，众所周知，这对包括人类在内的生物都有不利影响。我们提出了一个新的软件包来模拟从地面辐射测量光污染。该软件被称为Otus 3，它结合了具有不同大气剖面、云量和城市排放函数的创新ALAN扩散模型。迄今为止，光污染模型通常集中于计算城市灯光产生的天光的天顶亮度。在Otus 3中，我们扩展了这一点，并增加了地面上的水平照度模型，包括来自天光和直接照明的贡献。我们利用可见光红外成像辐射计套件（VIIRS）的地面辐射数据将Otus 3应用于法国。我们使用6年来在139个不同地点获得的精确天空亮度测量来校准我们的模型，并将该数据集公开。我们为法国制作了2013-2018年和2019-2024年期间的第一张人工照度图。我们发现，在这两个时期之间，午夜的人造地面照度下降了23%，与全球趋势形成鲜明对比。

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引用次数: 0

Radiance-to-irradiance conversion in the visible and near-infrared bands under clear-sky conditions 晴空条件下可见光和近红外波段的辐射-辐照度转换

IF 1.9 3区物理与天体物理 Q2 OPTICS

Journal of Quantitative Spectroscopy & Radiative Transfer

Pub Date : 2025-11-27 DOI: 10.1016/j.jqsrt.2025.109777

Xiang Zhong , Baike Xi , Xiquan Dong , Jordann Brendecke , Jake Gristey , Maria Hakuba , Bruce Kindel , Steven Massie , Daniel Feldman , Peter Pilewskie

Accurately partitioning shortwave (SW) radiation into its visible (VIS) and near-infrared (NIR) spectral components is essential for climate models and radiation budget studies, as it governs how the atmosphere absorbs, scatters, and reflects incoming solar energy. In support of NASA’s Libera mission, this study presents a novel method for deriving VIS and NIR irradiances from SW, VIS, and NIR satellite-based radiance measurements under clear-sky conditions by leveraging satellite-based radiance measurements across SW, VIS, and NIR bands. The method centers on a parameterization of the ratio of anisotropic factors, denoted as β (Eq. 3), which varies significantly with solar zenith angle (SZA), viewing zenith angle (VZA), relative azimuth angle (RAA), and aerosol optical depth (AOD). A polynomial regression model is developed to estimate β for different surface types. By combining the regressed β with the radiance ratio of VIS to NIR, which will be directly observed by Libera, the method partitions total SW irradiance into its VIS and NIR components. Validation against MODTRAN6.0 radiative transfer simulations over forest and desert surfaces demonstrates high fidelity, with discrepancies under 3 W m⁻². The approach performs best at backward scattering angles and exhibits more consistent results over vegetated surfaces than over bright, arid terrain. While initial testing is focused on two surface types, the demonstrated sensitivity of β to key atmospheric and geometric parameters indicates strong potential for extension to a wide range of land cover types and atmospheric conditions. Future work will focus on expanding the method to cloudy scenes, improving the regression model, and cross-validating results with alternative radiative transfer tools and in situ measurements.

准确地将短波（SW）辐射划分为可见光（VIS）和近红外（NIR）光谱成分对于气候模型和辐射预算研究至关重要，因为它决定了大气如何吸收、散射和反射入射的太阳能。为了支持NASA的Libera任务，本研究提出了一种新的方法，通过利用基于卫星的SW、VIS和NIR波段的亮度测量，在晴朗的天空条件下，从SW、VIS和NIR卫星的亮度测量中获得VIS和NIR辐照度。该方法的核心是各向异性因子的参数化比率，表示为β (Eq. 3)，该系数随太阳天顶角（SZA）、观测天顶角（VZA）、相对方位角（RAA）和气溶胶光学深度（AOD）而显著变化。建立了一个多项式回归模型来估计不同表面类型的β。该方法通过将回归的β与Libera直接观测到的VIS / NIR辐射比相结合，将SW总辐照度划分为VIS和NIR分量。MODTRAN6.0对森林和沙漠表面辐射传输模拟的验证显示出高保真度，差异在3w m⁻²以下。该方法在反向散射角度下表现最好，并且在植被表面上比在明亮的干旱地形上显示出更一致的结果。虽然最初的测试主要集中在两种地表类型，但β对关键大气和几何参数的敏感性表明，它有很强的潜力扩展到广泛的土地覆盖类型和大气条件。未来的工作将侧重于将该方法扩展到多云场景，改进回归模型，并使用替代辐射传输工具和原位测量交叉验证结果。

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引用次数: 0

Polarized infrared radiative transfer in an optically anisotropic medium: A Markov chain solution for remote sensing of atmospheric suspended particles 基于蒙特卡罗的光伏太阳能农场辐射传输模拟：在天气和气候模式中实现快速和准确的参数化

IF 1.9 3区物理与天体物理 Q2 OPTICS

Journal of Quantitative Spectroscopy & Radiative Transfer

Pub Date : 2025-11-27 DOI: 10.1016/j.jqsrt.2025.109776

Feng Xu , Congcong Qiao , Braxton C. Gosvener , Benting Chen , Lan Gao , Jens Redemann , Anthony B. Davis , Olga V. Kalashnikova , W. Reed Espinosa , Jie Gong , Dong L. Wu , Zhao-Cheng Zeng , Oleg Dubovik

A Markov chain approach is developed to model polarized mid- to long-wave infrared radiative transfer in an optically anisotropic medium. Such a medium contains oriented non-spherical particles with azimuthal randomness. Our model considers variations of temperature, pressure, gas concentration, and particle size distribution in the vertical dimension of the medium and resolves the total and polarized radiation in two-dimensional angular space. It also accounts for emission, scattering, and absorption of the medium, as well as directional and polarized surface emission and reflection. Illustrative simulations are performed using MODIS infrared bands centered at 9.73, 11.03, and 12.02 μm and several standard model atmospheres containing oriented dust or ice spheroids. The results are compared to those obtained for spherical droplets. Our preliminary numerical results demonstrate that while infrared brightness temperature contains information about particle amount, size, and layer height, adding multi-angle and spectro-polarimetry provides further remote sensing sensitivity to type, orientation, and morphology of the non-spherical particles. When reliable a priori information on the atmospheric physical temperature and absorbing gas profiles is available, infrared multi-angle polarimetry is a promising tool to fill the gap of shortwave and microwave remote sensing by resolving micro-meter scale particle properties to which shortwave and microwave frequencies have less sensitivity. Our simulation also reveals that solar radiation exerts a pronounced influence on the top-of-atmosphere brightness temperature when the wavelength approaches the short-wavelength end of the mid-wave infrared (≈3–4 μm).

提出了一种马尔可夫链方法来模拟光学各向异性介质中偏振中长波红外辐射传输。这种介质包含有取向的非球形粒子，具有方位随机性。我们的模型考虑了温度、压力、气体浓度和粒径分布在介质垂直维度上的变化，并在二维角空间上解析了总辐射和极化辐射。它还考虑了介质的发射、散射和吸收，以及定向和极化表面发射和反射。利用以9.73、11.03和12.02 μm为中心的MODIS红外波段和几种含有定向尘埃或冰球的标准模式大气进行了说明性模拟。结果与球形液滴的结果进行了比较。我们的初步数值结果表明，虽然红外亮度温度包含了颗粒数量、大小和层高的信息，但添加多角度和光谱偏振法可以进一步提高对非球形颗粒类型、取向和形态的遥感灵敏度。当有可靠的大气物理温度和吸收气体分布的先验信息时，红外多角度偏振法可以解决微米尺度的粒子特性，填补短波和微波遥感的空白，这是一种很有前途的工具。模拟结果还表明，当太阳辐射波长接近中波红外短波长端（≈3-4 μm）时，对大气顶亮温有显著的影响。

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引用次数: 0

Inter-comparison of different order-scattering models for accurate sensing in dusty conditions 多尘条件下不同阶散射模型的相互比较

IF 1.9 3区物理与天体物理 Q2 OPTICS

Journal of Quantitative Spectroscopy & Radiative Transfer

Pub Date : 2025-11-21 DOI: 10.1016/j.jqsrt.2025.109760

Safae Nejjari , Amine Ben Daoued , Frédéric Bernardin , Christophe Debain , Philippe Samuel Heritier

One of the major challenges in smart farming is the dust suspension during operations. Optical sensors embedded in agricultural machines and robots become less effective under such conditions, which compromises the accuracy of measurements and consequently the decision-making process. This study represents a comparative analysis of light transmission models under different configurations, from the Beer–Lambert model to different order scattering models, to assess the effectiveness of each model in different scenarios. This comparison is based on the simulation of a transmissiometer system, operating in a homogeneous dusty medium, consisting of suspended mineral dust particles. The evaluation includes the quantification of relative errors between various models across different optical depth values, sensor fields of view, and source divergence angles. Single, Double, Triple, Quadruple, and Multiple Scattering models were also considered in the quantitative comparison, to identify the conditions under which each model provides sufficient accuracy. Additionally, the influence of different scattering phase functions was investigated. The results highlight that the choice of scattering phase function significantly affects the relative errors, especially at angles close to the main propagation axis. The goal of this classification is to determine scenarios where simplified models can be employed for real-time monitoring, as increasing the order of scattering significantly raises the computational cost, making them less suitable for such applications. This classification helps establish a trade-off between physical accuracy and computational efficiency.

智能农业面临的主要挑战之一是操作过程中的粉尘悬浮。在这种条件下，农业机械和机器人中嵌入的光学传感器变得不那么有效，这损害了测量的准确性，从而影响了决策过程。本研究对不同配置下的光传输模型进行了对比分析，从Beer-Lambert模型到不同阶散射模型，以评估每种模型在不同场景下的有效性。这种比较是基于在由悬浮矿物粉尘颗粒组成的均匀粉尘介质中运行的透射仪系统的模拟。评估包括量化不同模型在不同光学深度值、传感器视场和光源发散角之间的相对误差。定量比较中还考虑了单散射、双散射、三散射、四散射和多重散射模型，以确定每种模型提供足够精度的条件。此外，还研究了不同散射相函数的影响。结果表明，散射相函数的选择对相对误差有显著影响，特别是在接近主传播轴的角度。这种分类的目的是确定可以使用简化模型进行实时监测的场景，因为增加散射的顺序会显著提高计算成本，使其不太适合此类应用。这种分类有助于在物理精度和计算效率之间建立一种权衡。

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引用次数: 0

Study of linear depolarization ratios across a wide range of scattering angles for particles of diverse sizes, shapes, and complex refractive indices 不同尺寸、形状和复折射率粒子在大散射角范围内的线性退极化比研究

IF 1.9 3区物理与天体物理 Q2 OPTICS

Journal of Quantitative Spectroscopy & Radiative Transfer

Pub Date : 2025-11-21 DOI: 10.1016/j.jqsrt.2025.109761

Prakash Gautam , Justin B. Maughan , Hans Moosmüller , Kurt Ehlers , Christopher M. Sorensen

Polarimetry is a valuable technique for remote sensing of atmospheric aerosol particles, with the linear depolarization ratio (LDR) being a key parameter used to characterize particle properties. This study investigates the LDRs of various aerosol particles, including nearly spherical and irregular aluminum oxide (Al₂O₃), Arizona Road Dust (AZRD), and molybdenum disulfide (MoS₂) particles, using both laboratory measurements conducted at a wavelength of 532 nm over a scattering angle range from 0.32° to 177.6° and theoretical model computations for spheroids and Gaussian random spheres. The results demonstrate that the LDR is strongly influenced by particle size, shape, and refractive index, with significant variations across different scattering angles. In the forward-scattering regime, LDR values are small due to scattering being dominated by diffraction, while in the side-scattering regime, LDR increases, peaking around 140° to 160°, before decreasing in the back-scattering regime. This study further explores the relationship between LDR and particle morphology, as well as the impact of the imaginary part of the complex refractive index on LDR, with results showing that higher absorption leads to lower LDRs. Overall, this study contributes to a better understanding of how LDR behaves for different particle types and scattering angles, enhancing our understanding of the optical properties of aerosol particles towards improved polarimetric remote sensing retrievals.

偏振法是遥感大气气溶胶粒子的一项有价值的技术，线性去极化比（LDR）是表征气溶胶粒子特性的关键参数。本文研究了各种气溶胶颗粒的LDRs，包括近球形和不规则的氧化铝（Al2O3），亚利桑那道路粉尘（AZRD）和二硫化钼（MoS2）颗粒，使用波长为532 nm，散射角范围为0.32°至177.6°的实验室测量和球形和高斯随机球体的理论模型计算。结果表明，LDR受颗粒大小、形状和折射率的影响较大，且在不同散射角度下变化显著。在前向散射区，由于散射以衍射为主，LDR值很小，而在侧向散射区，LDR值增加，在140°~ 160°左右达到峰值，后向散射区LDR值下降。本研究进一步探讨了LDR与粒子形态的关系，以及复折射率虚部对LDR的影响，结果表明吸收越高，LDR越低。总的来说，本研究有助于更好地理解LDR在不同颗粒类型和散射角度下的行为，增强我们对气溶胶颗粒光学特性的理解，从而改进偏振遥感检索。

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引用次数: 0

The dynamic characteristics of non-diffracting skyrmionic beams under tight focusing configurations 紧密聚焦条件下非绕射天电子束的动态特性

IF 1.9 3区物理与天体物理 Q2 OPTICS

Journal of Quantitative Spectroscopy & Radiative Transfer

Pub Date : 2025-11-20 DOI: 10.1016/j.jqsrt.2025.109756

Guoxia Han, Yihan Tian, Ke Hu, Feiyang Zhang, Maoda Jing, Guangyi Wang, Qihui Zhao, Li Zhao

Optical skyrmions stand out by virtue of their non-trivial topological structures and have attracted considerable interest of many researchers in recent years. However, the significant potential of non-diffracting skyrmionic beams for optical trapping and manipulation remains largely overlooked. In this work, the tight focusing properties of non-diffracting skyrmionic beams are investigated and the dynamic characteristics of the topological fields under tight focusing conditions are first explored. The topological properties of skyrmionic beams in Bessel modes under tight focusing conditions are studied systematically based on the Richards -Wolf vector diffraction theory. We theoretically demonstrate that a transformation of the phase difference is exhibited for skyrmionic beams through tight focusing process, while the skyrmion number remains unchanged in the central region. Furthermore, a comprehensive numerical analysis of the force and torque on Rayleigh particles exerted by the tightly focused skyrmionic beams is performed and the influence of skyrmion numbers and transverse components of the wave-vector on the trapping behaviors is conducted. The multi-particles can be captured in the tightly focused skyrmionic beams by adjusting these parameters. Our findings in this work allow a deeper exploration of skyrmions in applications, and provide essential theoretical support for its utilization in particle manipulation and sorting.

光学天幕以其非平凡的拓扑结构而引人注目，近年来引起了许多研究者的极大兴趣。然而，非衍射天空电子束在光学捕获和操纵方面的巨大潜力在很大程度上被忽视了。本文研究了非绕射天电子束的紧聚焦特性，并首次探讨了紧聚焦条件下拓扑场的动态特性。基于Richards -Wolf矢量衍射理论，系统地研究了紧密聚焦条件下贝塞尔模式下天空粒子束的拓扑特性。我们从理论上证明了在紧密聚焦过程中，天子光束的相位差发生了变化，而中心区域的天子数保持不变。在此基础上，对紧密聚焦的skyronic光束对Rayleigh粒子施加的力和扭矩进行了全面的数值分析，并对skyronic数和波矢量的横向分量对捕获行为的影响进行了研究。通过调整这些参数，可以在紧密聚焦的天粒子束中捕获多粒子。我们的研究结果允许对skyrmions在应用中的更深入探索，并为其在粒子操纵和分选中的应用提供重要的理论支持。

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引用次数: 0