Article
Instruments & Instrumentation
Jianyu Yang, Nan Li, Xunmin Zhu, Ming Chen, Mian Wu, Xingfan Chen, Cheng Liu, Jian Zhuang, Huizhu Hu
Summary: In recent years, levitated particles of optical traps in vacuum have shown enormous potential for precision sensor development and new physics exploration. However, the accuracy of the sensor is still hindered by the uncertainty of the calibration factor. In this paper, a novel calibration method using free-falling particles in vacuum is suggested and experimentally demonstrated, providing a protocol with high certainty and traceability.
Article
Optics
Lei Yang, Boyang Nie, Lidong Wei, Li Xu, Juanjuan Jing, Jinsong Zhou, Xiaoying He, Lei Feng, Yacan Li
Summary: This paper proposes a new distortion correction method based on the off-axis Schwarzschild two-mirror hyperspectral imager, using polynomial and radial distortion models for correction. Compared with conventional methods, this approach is simple and efficient, suitable for correcting distortion in non-mapping pushbroom hyperspectral imagers.
Article
Physics, Fluids & Plasmas
Corbyn Jones, Mauricio Gomez, Ryan M. Muoio, Alex Vidal, R. Anthony Mcknight, Nicholas D. Brubaker, Wylie W. Ahmed
Summary: This study investigates the stochastic force dynamics of a model microswimmer using experimental, theoretical, and numerical methods. It directly measures the stochastic forces generated by the microswimmer using an optical trap and analyzes the energetics using methods from stochastic thermodynamics, finding complex oscillatory force dynamics and high power dissipation.
Article
Multidisciplinary Sciences
Giuseppe Ortolano, Pauline Boucher, Ivo Pietro Degiovanni, Elena Losero, Marco Genovese, Ivano Ruo-Berchera
Summary: A protocol addressing the conformance test problem is introduced, showing that a simple quantum strategy can outperform any classical strategy. The experimental implementation of this protocol using optical twin beams validates the theoretical results and demonstrates a quantum advantage in a realistic setting.
News Item
Optics
Xiaohe Zhang, Bing Gu, Cheng-Wei Qiu
Summary: Researchers have proposed a new method that can measure the weak force of a single microscopic particle.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Multidisciplinary Sciences
Ane Kritzinger, Andrew Forbes, Patricia B. C. Forbes
Summary: In this study, micro-scaled polymer beads were functionalized with nano-scaled quantum dots to enable optical trapping and tweezing in an all-digital all-optical configuration, with in-situ fluorescence measurement. The chemistry required for this process, including deactivating the optical trapping environment and controlling size, adhesion, and agglomeration, is outlined. A novel holographic optical trapping set-up utilizing vectorially structured light is introduced, allowing for the delivery of tuneable forms of light and advancing the application of optics in chemistry.
SCIENTIFIC REPORTS
(2022)
Article
Multidisciplinary Sciences
Victor Vidyapin, Yingwen Zhang, Duncan England, Benjamin Sussman
Summary: We present a simple and effective method to characterize the per pixel quantum efficiency and temporal resolution of a single photon event camera for quantum imaging. Using photon pairs generated through spontaneous parametric down-conversion, we extract the detection efficiency and temporal resolution through coincidence measurements. In evaluating the TPX3CAM with image intensifier, we measure an average efficiency of 7.4 +/- 2% and a temporal resolution of 7.3 ns. This technique also identifies important error mechanisms in post-processing. We believe this method will be valuable for characterizing other quantum imaging systems.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Hongru Ding, Pavana Siddhartha Kollipara, Linhan Lin, Yuebing Zheng
Summary: Optothermal tweezers, with superior manipulation capability at low optical intensity, are limited by implicit understanding of the working mechanism. By revealing the atomistic view of opto-thermo-electro-mechanic coupling, we have developed high-performance tweezers using low-concentrated electrolytes and demonstrated their efficiency in separating colloidal particles based on surface charge differences.
Article
Optics
P. A. Prudkovskii, D. A. Safronenkov, G. Kh Kitaeva
Summary: We extend the absolute quantum efficiency (QE) calibration method to analog detectors with a high dispersion of single-photon responses. By measuring the biphoton field correlation function and approximating the distribution of detector readings, we demonstrate a reliable measurement of photomultiplier tube (PMT) cathode QE.
Article
Chemistry, Analytical
Alexander B. Stilgoe, Declan J. Armstrong, Halina Rubinsztein-Dunlop
Summary: Trap stiffness is a key property in using optical tweezers as a force transducer and can be determined using maximum-likelihood-estimator analysis (FORMA). By observing a particle fall into an optical trap once at a high stiffness, trap stiffness for a two micron particle can be determined with precision, making it ideal for systems of large numbers of particles without the need for a nanopositioning stage.
Article
Optics
Mohammad Mahdi Shanei, Einstom Engay, Mikael Kaell
Summary: Researchers have proposed an ultra-thin silicon-based metasurface technology that enables simultaneous confinement and propulsion of microparticles, allowing for the trapping and transport of microscopic particles in a thin liquid cell. This technology is expected to play a significant role in areas such as miniaturized optical sensing, driving, and sorting.
Article
Biochemical Research Methods
Rob Ward, Sapna Ravindran, Mariela R. Otazo, Braden Cradock, Ebubekir Avci, Graeme Gillies, Christina Coker, Martin A. K. Williams
Summary: The advancement in technologies allowing probing of individual microscopic particles has opened up new experimental possibilities in colloidal systems. However, due to the probabilistic nature of the process, testing a large number of particle pairs is necessary under each set of experimental conditions to obtain meaningful data.
Article
Nanoscience & Nanotechnology
Wenqiang Li, Xia Wang, Jiaming Liu, Shuai Li, Nan Li, Huizhu Hu
Summary: Introducing rotational degree of control into conventional optical tweezers offers new possibilities in physics, optical manipulation, and life science. Previous rotational schemes relied on microsphere anisotropy, limiting their applications. This study demonstrates the first experimental realization of orbiting a homogeneous microsphere using angular momentum in a transversely rotating optical trap. This method enables the exploration of orbital-translational coupling and the creation of an ultra-stable micro-gyroscope.
Article
Multidisciplinary Sciences
Qikun Yi, Xin Dai, Byung Min Park, Junhao Gu, Jiren Luo, Ri Wang, Cong Yu, Songzi Kou, Jinqing Huang, Richard Lakerveld, Fei Sun
Summary: Engineered living materials (ELMs) have gained attention for their unique properties and nonequilibrium thermodynamics. This study presents a strategy to assemble engineered Saccharomyces cerevisiae into self-propagating ELMs using ultrahigh-affinity protein/protein interactions. These materials have potential applications in chemical separation and biomedical fields.
Article
Optics
Yue Li, Yadong Hu, Yinlin Yuan, Peng Zou, Xiaobing Zheng
Summary: An SNR over 1000 is necessary for realizing the correlated photon radiometric benchmark. To improve the SNR for low-photon flux detection, a switched integration amplifier (SIA) is designed. A measurement facility is built to evaluate the SNR of the SIA-based photodetector at representative wavelengths.
Article
Optics
Rfaqat Ali, R. S. Dutra, F. A. Pinheiro, P. A. Maia Neto
Summary: A novel scheme is proposed for all-optical enantioselection and sorting of single multipolar chiral microspheres based on optical pulling forces from two non-collinear, non-structured, circularly polarized light sources. This method allows for external control by varying the angle between incident wavevectors for fine-tuning of chiral indices for enantioselection, achieving all-optical sorting of chiral microspheres with arbitrarily small chiral parameters.
Article
Astronomy & Astrophysics
Vinicius Henning, Benjamin Spreng, Paulo A. Maia Neto, Gert-Ludwig Ingold
Summary: The study investigates the Casimir interaction energy between a plane and a sphere at finite temperature as a function of the closest approach distance. The analytical result reveals the joint effect of spherical geometry and temperature, with two logarithmic terms arising from the Matsubara zero-frequency contribution. This correction to the proximity-force approximation is valid for intermediate temperatures.
Article
Astronomy & Astrophysics
Giuseppe Bimonte, Benjamin Spreng, Paulo A. Maia Neto, Gert-Ludwig Ingold, Galina L. Klimchitskaya, Vladimir M. Mostepanenko, Ricardo S. Decca
Summary: In this study, the differential Casimir force between an Au-coated sapphire sphere and Au-coated deep silicon trenches was determined using a micromechanical torsional oscillator. The results showed that the influence of surface roughness and edge effects on the measured force is negligible. The distribution of patch potentials and their impact on the measured force were characterized using Kelvin probe microscopy.
Article
Optics
R. Ali, R. S. Dutra, F. A. Pinheiro, P. A. Maia Neto
Summary: The study theoretically investigated optical tweezing of gain-functionalized microspheres using a highly focused single beam in the nonparaxial regime. Optical gain was found to play a crucial role in optical manipulation, especially in trapping large refractive index and plasmonic particles, with the ability to manipulate the equilibrium position of tweezed particles by varying the gain value through changing the pump power. This finding opens new pathways for gain-assisted optomechanics, particularly in facilitating optical trapping and manipulation of plasmonic nanoparticles with potential applications in self-assembling of nanoparticle suspensions and on a chip.
Article
Physics, Applied
F. Gomez, R. S. Dutra, L. B. Pires, Glauber R. de S. Araujo, B. Pontes, P. A. Maia Neto, H. M. Nussenzveig, N. B. Viana
Summary: Researchers established an explicit partial-wave series for the image of dielectric microspheres collected by a typical infinity-corrected microscope, incorporating the angular-spectrum theorem and Wigner rotation matrix elements. They considered a high numerical aperture objective and spherical aberration introduced by refraction, ensuring accurate characterization of the microspheres. The theoretical model was validated through comparisons with experimental data, demonstrating good agreement in measuring particle properties.
PHYSICAL REVIEW APPLIED
(2021)
Article
Physics, Multidisciplinary
Guilherme C. Matos, Reinaldo de Melo e Souza, Paulo A. Maia Neto, Francois Impens
Summary: This paper discusses the quantum electrodynamical analog of Sagnac phase induced by the fast rotation of a neutral nanoparticle and its impact on atomic waves nearby, comparing the effect to geometric Berry phase in optics and the analogous noninertial effect to the Aharonov-Bohm effect. The study shows that even when at rest with respect to an inertial frame, rotation confined to a specific domain of space can still generate atomic phase, and utilizing plasmon resonance can bring the induced phase close to the sensitivity limit of modern interferometers. The quantum vacuum Sagnac atomic phase is identified as a geometric signature of the dynamical Casimir-like effect.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Francois Impens, Reinaldo De Melo E. Souza, Guilherme C. Matos, Paulo A. Maia Neto
Summary: The coupling between a moving ground-state atom and the quantum electromagnetic field leads to intriguing phenomena such as the dynamical Casimir emission of photons and Sagnac-like geometric phase shifts in atom interferometers. Recent progress in this emerging field reveals unprecedented connections between non-trivial aspects of modern physics, including electrodynamic retardation, non-unitary evolution in open quantum systems, geometric phases, non-locality, and inertia.
Article
Physics, Nuclear
Tanja Schoger, Benjamin Spreng, Gert-Ludwig Ingold, Astrid Lambrecht, Paulo A. Maia Neto, Serge Reynaud
Summary: We study universal Casimir interactions in two configurations which appear as dual to each other. The first involves spheres described by the Drude model and separated by vacuum while the second involves dielectric spheres immersed in a salted solution at distances larger than the Debye screening length. Both cases are dominated by low-frequency transverse magnetic thermal fluctuations and show universality properties independent of the dielectric functions of the materials.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2022)
Article
Physics, Nuclear
Tanja Schoger, Benjamin Spreng, Gert-Ludwig Ingold, Paulo A. Maia Neto
Summary: This article reviews the study of proximity force approximation (PFA) and its corrections within the plane-wave basis for systems with spherical objects. The previous work is extended by considering polarization mixing during reflection. Explicit results for perfect electromagnetic conductors are presented. Additionally, it is shown that for perfect electric conductors at zero temperature, terms of half-integer order in the distance between the sphere surfaces appear beyond the leading-order correction to the PFA.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2022)
Article
Physics, Multidisciplinary
Tanja Schoger, Benjamin Spreng, Gert-Ludwig Ingold, Paulo A. Maia Neto, Serge Reynaud
Summary: We studied the Casimir interaction between two dielectric spheres immersed in a salted solution and found that this interaction exhibits universality properties at distances larger than the Debye screening length. This finding is important for the modeling of colloids and biological interfaces.
PHYSICAL REVIEW LETTERS
(2022)
Article
Mathematics, Interdisciplinary Applications
D. S. R. Ferreira, J. Ribeiro, P. S. L. Oliveira Jr, A. R. Pimenta, R. P. Freitas, R. S. Dutra, A. R. R. Papa, J. F. F. Mendes
Summary: This study analyzes the spatiotemporal distributions of earthquakes and finds that there is no differentiation in the statistical features of earthquakes. The results reveal the critical behavior and long-range spatiotemporal correlations in earthquakes.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Materials Science, Multidisciplinary
R. Ali, R. S. Dutra, S. Iqbal
Summary: Using two linearly (circularly) polarized plane waves, an intriguing phenomenon of local positive and negative radiation pressure on dielectric (chiral) slabs is revealed. A theory is developed for the first time to describe the local radiation pressure caused by the interference between the two obliquely impinging (non-collinear) light sources. Numerical analysis shows that the radiation pressure on the slabs strongly depends on the angle of incidence, polarization, and chirality parameters.
Article
Chemistry, Multidisciplinary
Andre R. Pimenta, Valter S. Felix, Daniele M. Silva, Marcelo O. Pereira, Ana L. Oliveira, Douglas S. Ferreira, Cristiano S. Carvalho, Fabricio L. Silva, Elicardo A. S. Goncalves, Rafael S. Dutra, Leandro O. Pereira, Ronaldo Pereira, Renato P. Freitas
Summary: This work demonstrates the potential and application of macro elemental mapping by XRF scanning in the forensic investigation of artworks. The images obtained through MA-XRF scanning provide information about the distribution of elements related to the pigments used in the artworks. Analyzing these images allows for insights into the process of creating the artwork and its conservation and restoration history.
Article
Physics, Multidisciplinary
L. B. Pires, D. S. Ether, B. Spreng, G. R. S. Araujo, R. S. Decca, R. S. Dutra, M. Borges, F. S. S. Rosa, G. L. Ingold, M. J. B. Moura, S. Frases, B. Pontes, H. M. Nussenzveig, S. Reynaud, N. B. Viana, P. A. Maia Neto
Summary: Our study utilized optical tweezers to measure the colloidal interaction between two silica microspheres in an aqueous solution. The addition of salt suppressed the double-layer interaction, leading to a purely attractive Casimir signal. Experimental data showed good agreement with theoretical results based on the scattering approach, revealing the nature of the thermal zero-frequency contribution and indicating a longer range for Casimir attraction across polar liquids than previously predicted.
PHYSICAL REVIEW RESEARCH
(2021)
