In this Letter, we demonstrate the first, to the best of our knowledge, coherent propulsion with negative-mass fields in an optical analog. We observe a self-accelerating state, driven by a nonlinear coherent interaction of its two components that are experiencing diffractions of opposite signs in a photonic lattice, which is analogous to the interaction of two objects with opposite mass signs. Surprisingly, the coherent propulsion is highly immune to the initial phase of the two components, which is in sharp contrast with the behavior encountered in traditional coherent wave interactions. Compared to its incoherent counter-part, the coherent propulsion exhibits an enhanced acceleration.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OL.44.005949 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Black hole jets on the scale of the cosmic web.
Nature
September 2024
Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA, USA.
When sustained for megayears (refs. ), high-power jets from supermassive black holes (SMBHs) become the largest galaxy-made structures in the Universe. By pumping electrons, atomic nuclei and magnetic fields into the intergalactic medium (IGM), these energetic flows affect the distribution of matter and magnetism in the cosmic web and could have a sweeping cosmological influence if they reached far at early epochs.
View Article and Find Full Text PDFPathfinder experiments with atom interferometry in the Cold Atom Lab onboard the International Space Station.
Nat Commun
August 2024
Department of Physics and Astronomy, Institute of Optics, Center for Coherence and Quantum Optics, University of Rochester, Rochester, NY, 14627, USA.
Deployment of ultracold atom interferometers (AI) into space will capitalize on quantum advantages and the extended freefall of persistent microgravity to provide high-precision measurement capabilities for gravitational, Earth, and planetary sciences, and to enable searches for subtle forces signifying physics beyond General Relativity and the Standard Model. NASA's Cold Atom Lab (CAL) operates onboard the International Space Station as a multi-user facility for fundamental studies of ultracold atoms and to mature space-based quantum technologies. We report on pathfinding experiments utilizing ultracold Rb atoms in the CAL AI.
View Article and Find Full Text PDFAlpha and beta/low-gamma frequency bands may have distinct neural origin and function during post-stroke walking.
Exp Brain Res
October 2024
Department of Basic and Clinical Sciences, University of Nicosia Medical School, 21 Ilia Papakyriakou, Block C, Rm 202, 1700, Nicosia, Cyprus.
Plantarflexors provide propulsion during walking and receive input from both corticospinal and corticoreticulospinal tracts, which exhibit some frequency-specificity that allows potential differentiation of each tract's descending drive. Given that stroke may differentially affect each tract and impair the function of plantarflexors during walking; here, we examined this frequency-specificity and its relation to walking-specific measures during post-stroke walking. Fourteen individuals with chronic stroke walked on an instrumented treadmill at self-selected and fast walking speed (SSWS and FWS, respectively) while surface electromyography (sEMG) from soleus (SOL), lateral gastrocnemius (LG), and medial gastrocnemius (MG) and ground reaction forces (GRF) were collected.
View Article and Find Full Text PDFHierarchical Phased-Array Antennas Coupled to Al KIDs: A Scalable Architecture for Multi-band Millimeter/Submillimeter Focal Planes.
J Low Temp Phys
June 2024
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, 91109 CA USA.
We present the optical characterization of two-scale hierarchical phased-array antenna kinetic inductance detectors (KIDs) for millimeter/submillimeter wavelengths. Our KIDs have a lumped-element architecture with parallel plate capacitors and aluminum inductors. The incoming light is received with a hierarchical phased array of slot dipole antennas, split into 4 frequency bands (between 125 GHz and 365 GHz) with on-chip lumped-element band-pass filters, and routed to different KIDs using microstriplines.
View Article and Find Full Text PDFSurface properties of the seas of Titan as revealed by Cassini mission bistatic radar experiments.
Nat Commun
July 2024
Università di Bologna, Dipartimento di Ingegneria Industriale, Forlì, Italy.
Saturn's moon Titan was explored by the Cassini spacecraft from 2004 to 2017. While Cassini revealed a lot about this Earth-like world, its radar observations could only provide limited information about Titan's liquid hydrocarbons seas Kraken, Ligeia and Punga Mare. Here, we show the results of the analysis of the Cassini mission bistatic radar experiments data of Titan's polar seas.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!