Tootfinder

Optical centrifuge for nanoparticles
Peiyao Xiong, Kit Ka Kelvin Ho, J. M. H. Gosling, M. Rademacher, P. F. Barker
https://arxiv.org/abs/2506.16134 https:/…

Optical centrifuge for nanoparticles
We study the creation of an optical centrifuge for the controlled rotation of levitated nanorotors within an optical tweezer. The optical centrifuge is created by rapidly rotating the linear polarization of the tightly focused optical field used to form an optical trap. We show that nanorotors, formed by anisotropic nanoparticles levitated within the trap, can be accelerated to well-defined rotational rates in excess of 100 MHz over durations of hundreds of microseconds. The initial conditions …

Giant Magneto-Optical Effects in Two-Dimensional Flat-Band Antiferromagnets
Ping Yang, Wanxiang Feng, Siyuan Liu, Shan Guan, Liwei Wen, Wei Jiang, Gui-Bin Liu, Yugui Yao
https://arxiv.org/abs/2506.16749

Giant Magneto-Optical Effects in Two-Dimensional Flat-Band Antiferromagnets
In this work, we reveal giant magneto-optical responses in two-dimensional(2D) antiferromagnets with nearly flat electronic bands, based on first-principles calculations and group-theoretical analysis. We identify a record-large second-order magneto-optical Schafer-Hubert(SH) effect, featuring a polarization rotation angle of 28 degree, in monolayer antiferromagnetic RuOCl2, driven by flatband-enhanced interband optical transitions. Both the valence and conduction bands exhibit pronounced direc…

Existence of Coupled Optical Vortex Solitons Propagating in a Quadratic Nonlinear Medium
Luciano Medina
https://arxiv.org/abs/2506.16452 https://

Existence of Coupled Optical Vortex Solitons Propagating in a Quadratic Nonlinear Medium
We consider the coupled propagation of an optical field and its second harmonic in a quadratic nonlinear medium governed by a coupled system of Schrodinger equations. We prove the existence of ring-profiled optical vortex solitons appearing as solutions to a constrained minimization problem and as solutions to a min-max problem. In the case of the constrained minimization problem solutions are shown to be positive with undetermined wave propagation constants, but in the min-max approach the wav…

Optimized cerebral blood flow measurement in speckle contrast optical spectroscopy via refinement of noise calibration
Ninghe Liu, Yu Xi Huang, Simon Mahler, Changhuei Yang
https://arxiv.org/abs/2506.15843

Optimized cerebral blood flow measurement in speckle contrast optical spectroscopy via refinement of noise calibration
Speckle contrast optical spectroscopy (SCOS) offers a non-invasive and cost-effective method for monitoring cerebral blood flow (CBF). However, extracting accurate CBF from SCOS necessitates precise noise pre-calibration. Errors from this can degrade CBF measurement fidelity, particularly when the overall signal level is low. Such errors primarily stem from residual speckle contrast associated with camera and shot noise, whose fluctuations exhibit a temporal structure that mimics cerebral blood…

Optical Appearance and Shadow of Kalb-Ramond Black Hole: Effects of Plasma and Accretion Models
Mou Xu, Ruonan Li, Jianbo Lu, Shining Yang, Shu-Min Wu
https://arxiv.org/abs/2506.17075

Optical Appearance and Shadow of Kalb-Ramond Black Hole: Effects of Plasma and Accretion Models
In this paper, we study the effect of the presence of plasma and different accretion models on the shadow and optical appearance of static spherically symmetric black holes containing the Kalb-Ramond field. We derive the motion equations for photons around the Kalb-Ramond black hole and constrain the Lorentz symmetry breaking parameters $λ$ and $γ$ using observational data released by the Event Horizon Telescope collaboration. The results indicate that, under the static spherical accretion mo…

Replaced article(s) found for physics.optics. https://arxiv.org/list/physics.optics/new
[1/1]:
- Principles and Metrics of Extreme Learning Machines Using a Highly Nonlinear Fiber
Mathilde Hary, Daniel Brunner, Lev Leybov, Piotr Ryczkowski, John M. Dudley, Go\&qu…

Influence of optical self-injection on statistical properties of laser-pulse interference
Roman Shakhovoy, Elizaveta Maksimova, Matvey Boltanskiy, Maxim Fadeev
https://arxiv.org/abs/2506.17037

Influence of optical self-injection on statistical properties of laser-pulse interference
Pulsed optical self-injection markedly affects the emission characteristics of semiconductor lasers. In this work, we analyze its influence on the statistical properties of laser-pulse interference. We experimentally demonstrate that varying the arrival time of reflected optical pulses back into the laser cavity influences the phase-diffusion and induces an effect that, by analogy with external optical injection, we call phase locking. A comprehensive theoretical analysis of this phenomenon is …

Active, reactive and instantaneous optical forces on small particles in the time domain: Ultrafast attosecond subcycle pulses
Xiaohao Xu, Francisco J. Valdivia Valero, Manuel Nieto-Vesperinas
https://arxiv.org/abs/2506.15917

Active, reactive and instantaneous optical forces on small particles in the time domain: Ultrafast attosecond subcycle pulses
Recently discovered reactive optical forces have nule time-average of their instantaneous values on monochromatic illumination, so that their detection suggests the use of ultrafast optics, specially in the femto and attosecond domains. By using illumination with subcycle attosecond evanescent pulses, we report a theoretical study of the time variations of reactive forces versus those of active and instantaneous ones on small resonant particles that we consider dipolar; and show their correspon…

3-dimensional plasmonic nanomotors driven by Optical Pulling Forces
Guillermo Serrera, Yoshito Y. Tanaka, Pablo Albella
https://arxiv.org/abs/2506.16811 ht…

3-dimensional plasmonic nanomotors driven by Optical Pulling Forces
Light-matter interactions generally involve momentum exchange between incident photons and the target object giving rise to optical forces and torques. While typically weak, they become significant at the nanoscale, driving intense research interest in the exploitation of photon recoil to drive micro- and nanostructures. While great progress has been attained in controlling transversal degrees of freedom, three-dimensional movement remains challenging, particularly due to the impractical realiz…

Feedback cooling scheme for an optically levitated oscillator with controlled cross-talk
J. M. H. Gosling, A. Pontin, F. Alder, M. Rademacher, T. S. Monteiro, P. F. Barker
https://arxiv.org/abs/2506.17172

Feedback cooling scheme for an optically levitated oscillator with controlled cross-talk
Levitated optical mechanical systems have demonstrated excellent force and impulse sensitivity and are currently being developed for the creation of non-classical states of motion in these new quantum systems. An important requirement in the design of these systems is the ability to independently control and cool all three translational degrees of freedom. Here we describe the design and implementation of a stable and robust 3D velocity feedback cooling scheme with particular emphasis on creati…