Article
Engineering, Electrical & Electronic
Xin Tong, Henan Liu, Guifang Li, Lin Zhang
Summary: The study introduces an integrated waveguide optical tweezer design that achieves focusing of upward radiation through etched trenches on a waveguide. Optimization of the antenna's structural parameters generates a quasi-Gaussian field distribution above the antenna. The gradient distribution of the electric field produces gradient force, enabling effective optical trapping of microscale particles.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Optics
Zheng Zhu, YuQuan Zhang, Aurele J. L. Adam, Changjun Min, H. Paul. Urbach, Xiaocong Yuan
Summary: Stable optical trapping of gold nanoparticles is crucial and beneficial for nanotechnology applications. However, the volume fraction of the sample during optical trapping is often overlooked as a factor affecting stability. Using the effective medium theory, this study analyzes the stability of optical trapping of gold nanoparticles in solutions of human serum albumin, HIV-1 virus, and gold nanoparticles. Comparative analysis reveals that both optical force and potential decrease with increasing volume fraction. This finding can enhance the control of gold nanoparticles in various applications.
OPTICS COMMUNICATIONS
(2023)
Article
Biochemical Research Methods
Khalil Mokri, Mohammad Hazhir Mozaffari, Ali Farmani
Summary: Plasmonics advanced materials combined with localized surface plasmon are capable of detecting environmental changes and manipulating nanoparticles. This study proposes a tunable plasmonic nano-tweezer that operates based on the polarization of the excitation laser light. By changing the polarization angle, the nano-tweezer can relocate nanoparticles using a structure composed of a gold nano-ring and a gold nano-disk.
IEEE TRANSACTIONS ON NANOBIOSCIENCE
(2022)
Article
Physics, Multidisciplinary
J. T. Wilson, S. Saskin, Y. Meng, S. Ma, R. Dilip, A. P. Burgers, J. D. Thompson
Summary: This study demonstrates that Rydberg states of ytterbium atoms can be trapped using a red-detuned optical tweezer, resulting in stable trapped Rydberg atom lifetimes exceeding 100 microseconds. The research also shows no evidence of auto- or photoionization from the trap light for these states. The coherence time between two Rydberg levels is measured to be 59 microseconds, exceeding the lifetime of untrapped Rydberg atoms under the same conditions.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Weijie Shi, Lili Tang, Shuyan Zhang, Jin Wang, Jiaqi Li, Zheng-Gao Dong
Summary: A geometric metalens is introduced that can produce a three-dimensional focusing curve with independently tailored phase distribution. Numerical calculations demonstrate that coexisting intensity-gradient and phase-gradient forces can propel particles along the curve. This design strategy has the potential to miniaturize the contactless system of multifunctional optical manipulation on tiny particles.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
Wei-Chen Lo, Ching-Hsiang Fan, Yi-Ju Ho, Chia-Wei Lin, Chih-Kuang Yeh
Summary: The AVT technique, inspired by tornadoes, successfully captures and increases the local concentration of MBs. This compact, easy-to-use, and biocompatible method enables systemic drug administration with extremely low doses.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Physical
Victoria Esteso, Sol Carretero-Palacios, Hernan Miguez
Summary: We study quantum trapping effects in planar nanocomposite materials and find that they strongly depend on the characteristics of spatial inhomogeneity. The presence of inclusions leads to intense repulsive Casimir-Lifshitz force due to strong optical scattering and absorption size-dependent resonances. Comprehensive knowledge and a detailed description of the potential inhomogeneity in materials are necessary for analyzing quantum trapping effects.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Quantum Science & Technology
T-W Hsu, W. Zhu, T. Thiele, M. O. Brown, S. B. Papp, A. Agrawal, C. A. Regal
Summary: In this study, we demonstrate the use of efficient dielectric metasurface lens for trapping and imaging single neutral atoms. We compare the performance of the metasurface lens with numerical computations and predict its potential for future applications in atom trapping and quantum information experiments.
Article
Optics
Zheng Zhu, Yuquan Zhang, Shuoshuo Zhang, Aurele J. L. Adam, Changjun Min, Hendrik Paul Urbach, Xiaocong Yuan
Summary: This study demonstrates, both theoretically and experimentally, the nonlinear optical tweezing within the RSA regime at ultrahigh intensities through an optical force reversal induced by nonlinear absorption. These findings provide guidance for improving nonlinear optical trapping systems and have beneficial implications for wider applications of nonlinear optics.
ADVANCED PHOTONICS
(2023)
Article
Materials Science, Multidisciplinary
Roger Bresoli-Obach, Santi Nonell, Hiroshi Masuhara, Johan Hofkens
Summary: This study reports an approach to control the induced optical force or potential by an external chemical stimulus, achieved by adjusting the dissolved oxygen concentration to control the triplet state and thus the optical force. This method has promising applications in various research fields.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Optics
I. Krasnov
Summary: This study proposes and theoretically investigates a novel mechanism for the formation of a deep optical superlattice (OSL) to trap three-dimensional (3D) resonant impurity atoms in a transparent cold buffer gas. This mechanism combines the rectification effect of the gradient force of light pressure with the effect of light-induced drift (LID) of atoms. By irradiating a gas mixture with a bichromatic combined light beam, which is a special coaxial superposition of cosine-Gaussian optical beams, a periodic 1D array of deep potential wells (OSL) is created along the beam axes. The LID then pulls resonant particles into the combined light beam and confines them transversely in the OSL.
Article
Optics
Fuxi Lu, Hao Wu, Yi Liang, Liu Tan, Zhifu Tan, Xu Feng, Yi Hu, Yinxiao Xiang, Xubo Hu, Zhigang Chen, Jingjun Xu
Summary: The study introduces specially modulated autofocusing beams with improved trapping capabilities compared to unmodulated beams, particularly the Bessel-modulated beam showing enhanced optical trapping force. These modulated beams have the potential to serve as new photonic tools for optical trapping and manipulation, outperforming conventional circular Airy beams in optical tweezers applications.
Article
Multidisciplinary Sciences
Junfei Li, Chen Shen, Tony Jun Huang, Steven A. Cummer
Summary: Acoustic tweezers utilize a single pair of sources and a shadow waveguide to achieve complex particle trapping and manipulation in a boundary-free chamber, without the need for interior structures that would interfere with flow or transport.
Article
Engineering, Electrical & Electronic
Zhi Cheng, Xin Tong, Lin Zhang
Summary: Near-field optical tweezers integrated on a chip are gaining attention for biological and chemical analyses. A low-loss Si waveguide with a high intensity gradient in the electric field is proposed for trapping microparticles. The device has high transmittance and the ability to analyze optical forces in all three dimensions.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Zhihai Liu, Fenghui Hu, Yu Zhang, Yaxun Zhang, Kai Zhang, Wenjie Su, Jianzhong Zhang, Xinghua Yang, Libo Yuan
Summary: This article introduces an all-fiber near-field optical tweezer for stable trapping of nanoparticles. The device uses a laser beam that has been totally reflected three times on a fiber tip to generate an evanescent field on the fiber end-face, trapping nanoparticles in water. Experimental results demonstrate that this all-fiber near-field optical tweezer can trap fluorescent particles as small as 100 nanometers in diameter with insignificant temperature rise.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Jianbao Zhao, Brant E. Billinghurst, Paul L. Raston
Summary: The far-infrared spectrum of room temperature formic acid labeled with 13C has been recorded and analyzed, leading to the determination of accurate line positions and predictions relevant to Earth's atmosphere and interstellar sources.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Semen Vasilchenko, Alexander Solodov, Oleg Egorov, Vladimir Tyuterev
Summary: Ozone plays a crucial role in atmospheric chemistry and radiative processes, and it may serve as a potential biosignature species in exoplanetary observations. This study utilized a continuous-wave cavity-ring-down spectrometer to accurately measure the absorption cross-sections of ozone in the near-infrared range. The results provide more precise data and have potential applications in atmospheric research.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Baorui Huang, Bo Peng, Qifeng Ren, Sheng Liao
Summary: This study utilizes the polarization bidirectional reflectance distribution function (p-BRDF) model derived from the microfacet theory to analyze the spectral p-BRDF of a brass surface. The results show that factors such as polarization state, wavelength, surface roughness, and permittivity have a significant impact on the distribution of BRDF on the object surface.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Qingwei Duan, Jiajie Wang, Qiwei Li, Xiang'e Han, Kuan Fang Ren
Summary: This paper introduces the applications of the generalized Lorenz-Mie theory (GLMT) and the vectorial complex ray model (VCRM) in the interaction between beams and particles. By comparing the experimental results, it is found that VCRM performs well in Gaussian beam scattering problems, providing a new method for studying the scattering of shaped beams by large particles/objects of any shape.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Yuefan Du, Xiaoping Li, Lei Shi, Fangyan Li, Shurong Yuan
Summary: This study proposes a physics-constrained model that utilizes the distribution characteristics of gas spectral parameters to predict spectral parameters for unknown wavelengths. Experimental results show that the model improves prediction accuracy and increases the data volume of gas spectral parameters by 4-5 times.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Laurentius Windholz, Imran Siddiqui, Shamim Khan, Syed Tanweer Iqbal
Summary: In this study, we report the discovery of two energy levels of the Pr atom that exhibit strong J-mixing, as well as the observed hyperfine structure patterns. The composition of wave functions, in addition to J-values, plays a crucial role in determining the appearance of these patterns.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Matthias Germann, Adrian Hjalten, Jonathan Tennyson, Sergei N. Yurchenko, Iouli E. Gordon, Christian Pett, Isak Silander, Karol Krzempek, Arkadiusz Hudzikowski, Aleksander Gluszek, Grzegorz Sobon, Aleksandra Foltynowicz
Summary: In this study, optical frequency comb Fourier transform spectroscopy was used to record the spectroscopic data of formaldehyde in a specific frequency range. The line positions and intensities of rovibrational transitions were obtained through line-by-line fitting. By incorporating these accurate line positions into the analysis, more energy levels and rovibrational transitions were predicted with reduced uncertainties in the H2CO spectrum.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Leonardo A. Ambrosio, Jhonas O. de Sarro, Gerard Gouesbet
Summary: This study derives a polychromatic version of the generalized Lorenz-Mie theory stricto sensu (GLMT) by expanding arbitrary time-dependent fields into partial waves using Bromwich scalar potentials. The new formalism introduces field shape spectra (FSSs) which are intrinsically frequency-dependent, modifying and redefining the physical quantities expressed in the monochromatic GLMT.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Patrick C. Chaumet
Summary: The paper proposes two new methods (IDR(s) and GPBiCGstab(L)) for computing the electromagnetic diffraction of objects larger than the wavelength. It is found that IDR(s) can reduce computation time but may not converge in some cases, while GPBiCGstab(L) always converges and also reduces computation time compared to QMR, GPBiCG, and BiCGstab.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Antigoni Kleanthous, Anthony J. Baran, Timo Betcke, David P. Hewett, Christopher D. Westbrook
Summary: To improve weather and climate models, it is important to accurately calculate the single-scattering properties of randomly oriented complex atmospheric ice crystals. This study applies Boundary Element Method (BEM) to calculate these properties in the microwave and sub-millimeter region of the electromagnetic spectrum for all-sky data assimilation. The results show that BEM can accurately compute the scattering properties of complex ice aggregates, which is crucial for weather and climate models.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Ben Niu, Yanting Li, Gang Xiong, Jihui Chen, Zhimin Hu, Yunqing Fu, Yaming Zou, Chongyang Chen, Ke Yao
Summary: This study presents both experimental and theoretical analysis of the 4d 2D5/2 -> 2D3/2 magnetic dipole transition in Rb-like ions. The correlation between the theoretical and experimental findings is observed, and it is illustrated that the contribution of the core-valence correlation is pivotal for the fine structure splittings.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
James A. Lock, Gunther P. Konnen, Philip Laven
Summary: Researchers have derived an analytical generalization of Airy theory that provides a more accurate approximation for the primary rainbow, but still has limitations for the second-order rainbow and beyond.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Shixiong Wu, Xuebang Gao, Xuqiang Dou, Li Xie
Summary: In this paper, an indoor experimental study was conducted to investigate the optical attenuation caused by sand/dust storms at different relative humidity levels. It was found that the hygroscopic growth of sand/dust particles has a significant effect on optical attenuation when the relative humidity is above 60%. Based on the double-parameter Kasten model, a proposed optical attenuation model takes into account visibility, particle size, relative humidity, and optical wavelength. Numerical calculations considering the hygroscopicity effect were also performed, and the results were in agreement with the experimental data.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Zhimin Yang, Jaeman Song, Bong Jae Lee
Summary: In this study, we analyze TPX cells operating in the self-sustaining circuit and examine the effects of different bandgaps on their performance. The results show that the bandgap energy of the LED must exceed that of the PV cell for the TPX cell to function in a self-sustaining parallel circuit. Additionally, a narrower bandgap energy for the PV cell and a wider bandgap energy for the LED can improve the performance of the TPX cell in the self-sustaining circuit.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)