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Hydrodynamic modulation instability triggered by a two-wave system.
Chaos
October 2024
Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan.
Article Synopsis
- Modulation instability (MI) causes regular nonlinear wave trains to break down, potentially resulting in localized phenomena like rogue waves across various nonlinear dispersive media, including hydrodynamics and optics.
- The classical MI dynamics can start with small-amplitude sidebands around a main wave peak, often visualized as a three-wave interaction setup in experiments, but more complex patterns can emerge through breather solutions of the nonlinear Schrödinger equation (NLSE).
- This study explores MI in deep-water surface gravity waves, demonstrating that it can be initiated by just a single unstable sideband, yielding experimental results that align closely with nonlinear simulations, while also indicating shifts in focusing cycle behavior observed in longer-term wave evolution.
A driven Kerr oscillator with two-fold degeneracies for qubit protection.
Proc Natl Acad Sci U S A
June 2024
Department of Applied Physics, Yale University, New Haven, CT 06520.
We present the experimental finding of multiple simultaneous two-fold degeneracies in the spectrum of a Kerr oscillator subjected to a squeezing drive. This squeezing drive resulting from a three-wave mixing process, in combination with the Kerr interaction, creates an effective static two-well potential in the phase space rotating at half the frequency of the sinusoidal drive generating the squeezing. Remarkably, these degeneracies can be turned on-and-off on demand, as well as their number by simply adjusting the frequency of the squeezing drive.
View Article and Find Full Text PDFConscience-Based Barriers to Medical Aid in Dying: A Survey of Colorado Physicians.
J Gen Intern Med
December 2024
Center for Bioethics and Humanities, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.
Background: Approximately 20% of the United States' population lives in a state or jurisdiction where medical aid in dying (MAiD) is legal. It is unknown how physicians' own barriers are associated with their provision of the spectrum of MAiD services.
Objective: To measure physicians' religious and/or ethical barriers to providing MAiD services and how such barriers relate to physicians' intentions and behaviors.
We designed a grating coupler optimized for normal incidence and numerically demonstrate near-unity coupling in a standard 220-nm-thick silicon-on-insulator (SOI) technology. Our design breaks the vertical symmetry within the grating region by implementing three scattering sites per local period. This technique removes the need for bottom reflectors or additional material layers and can be realized using only two lithography masks.
View Article and Find Full Text PDFFermi-Pasta-Ulam-Tsingou recurrence and cascading mechanism for resonant three-wave interactions.
Phys Rev E
June 2023
Department of Mechanical Engineering, University of Hong Kong, Pokfulam, Hong Kong.
Evolution of resonant three-wave interaction is governed by quadratic nonlinearities. While propagating localized modes and inverse scattering mechanisms have been studied, transient states such as rogue waves and breathers are not fully understood. Modulation instability modes can trigger growth of disturbances and the eventual development of breathers.
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