Geoacoustic inversion of modal dispersion on the New England Mud Patch. I: Experimental quantification of information content in higher-order modes

AbstractNiFe-based vortex spin-torque nano-oscillators (STNO) have been shown to be rich dynamic systems which can operate as efficient frequency generators and detectors, but with a limitation in frequency determined by the gyrotropic frequency, typically sub-GHz. In this report, we present a detailed analysis of the nature of the higher order spin wave modes which exist in the Super High Frequency range (3–30 GHz). This is achieved via micromagnetic simulations and electrical characterisation in magnetic tunnel junctions, both directly via the spin-diode effect and indirectly via the measurement of the coupling with the gyrotropic critical current. The excitation mechanism and spatial profile of the modes are shown to have a complex dependence on the vortex core position. Additionally, the inter-mode coupling between the fundamental gyrotropic mode and the higher order modes is shown to reduce or enhance the effective damping depending upon the sense of propagation of the confined spin wave.

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Submacropulse electron-beam dynamics correlated with higher-order modes in Tesla-type superconducting rf cavities

Physical Review Accelerators and Beams ◽

10.1103/physrevaccelbeams.21.064401 ◽

2018 ◽

Vol 21 (6) ◽

Cited By ~ 2

Author(s):

A. H. Lumpkin ◽

R. Thurman-Keup ◽

D. Edstrom ◽

J. Ruan ◽

N. Eddy ◽

...

Keyword(s):

Electron Beam ◽

Higher Order ◽

Beam Dynamics ◽

Rf Cavities ◽

Higher Order Modes ◽

Superconducting Rf ◽

Electron Beam Dynamics

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Investigation of Corrugation and Bow-tie loading on MMW SIW Antenna Using Higher Order Modes

2020 28th Iranian Conference on Electrical Engineering (ICEE) ◽

10.1109/icee50131.2020.9260848 ◽

2020 ◽

Author(s):

Mahdi Norooz Oliaei ◽

Mohammad Sadegh Abrishamian

Keyword(s):

Higher Order ◽

Higher Order Modes ◽

Bow Tie

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Design of large mode area all-solid anti-resonant fiber for high-power lasers

High Power Laser Science and Engineering ◽

10.1017/hpl.2021.7 ◽

2021 ◽

Vol 9 ◽

Author(s):

Xin Zhang ◽

Shoufei Gao ◽

Yingying Wang ◽

Wei Ding ◽

Pu Wang

Keyword(s):

High Power ◽

Single Mode ◽

Higher Order ◽

Coupling Scheme ◽

Resonant Coupling ◽

Higher Order Modes ◽

Mode Loss ◽

Fiber Mode ◽

Power Needs ◽

Mode Area

Abstract High-power fiber lasers have experienced a dramatic development over the last decade. Further increasing the output power needs an upscaling of the fiber mode area, while maintaining a single-mode output. Here, we propose an all-solid anti-resonant fiber (ARF) structure, which ensures single-mode operation in broadband by resonantly coupling higher-order modes into the cladding. A series of fibers with core sizes ranging from 40 to 100 μm are proposed exhibiting maximum mode area exceeding 5000 μm2. Numerical simulations show this resonant coupling scheme provides a higher-order mode (mainly TE01, TM01, and HE21) suppression ratio of more than 20 dB, while keeping the fundamental mode loss lower than 1 dB/m. The proposed structure also exhibits high tolerance for core index depression.

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