scholarly journals Optical magnetic lens: towards actively tunable terahertz optics

Nanoscale ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 108-116
Author(s):  
Georgii Shamuilov ◽  
Katerina Domina ◽  
Vyacheslav Khardikov ◽  
Alexey Y. Nikitin ◽  
Vitaliy Goryashko
Keyword(s):  
Magnetic Field ◽  
2D Materials ◽  
Magnetic Lens ◽  
Terahertz Optics

2D materials immersed into a non-uniform, profiled magnetic field can focus THz light. This opens the door to novel magnetically-tunable 2D lenses for ultrafast applications.

scholarly journals Magnetophonons & type-B Goldstones from hydrodynamics to holography

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Matteo Baggioli ◽  
Sebastian Grieninger ◽  
Li Li
Keyword(s):  
Magnetic Field ◽  
2D Materials ◽  
Goldstone Boson ◽  
Quasinormal Modes ◽  
Effective Field ◽  
Zero Magnetic Field ◽  
Type B ◽  
Hydrodynamic Modes ◽  
Pinning Mechanism ◽  
The Magnetic Field

Abstract We perform a detailed analysis of a large class of effective holographic models with broken translations at finite charge density and magnetic field. We exhaustively discuss the dispersion relations of the hydrodynamic modes at zero magnetic field and successfully match them to the predictions from charged hydrodynamics. At finite magnetic field, we identify the presence of an expected type-B Goldstone boson Re[ω] ∼ k2, known as magnetophonon and its gapped partner — the magnetoplasmon. We discuss their properties in relation to the effective field theory and hydrodynamics expectations. Finally, we compute the optical conductivities and the quasinormal modes at finite magnetic field. We observe that the pinning frequency of the magneto-resonance peak increases with the magnetic field, in agreement with experimental data on certain 2D materials, revealing the quantum nature of the holographic pinning mechanism.

Magnetic field, temperature and mechanical crack performance of a GdBCO magnetic lens

2012 ◽  
Vol 25 (11) ◽  
pp. 115012 ◽  
Author(s):  
Z Y Zhang ◽  
S Matsumoto ◽  
R Teranishi ◽  
T Kiyoshi
Keyword(s):  
Magnetic Field ◽  
Magnetic Lens ◽  
Field Temperature ◽  
Mechanical Crack

scholarly journals Influence of backstreaming ions on spot size of 2 MeV electron beam

2019 ◽  
Vol 37 (01) ◽  
pp. 159-164 ◽  
Author(s):  
Yury Trunev ◽  
Dmitry Skovorodin ◽  
Vitaly Astrelin ◽  
Valerii Danilov ◽  
Alexander Burdakov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Spot Size ◽  
Magnetic Lens ◽  
Particle In Cell ◽  
Non Invasive ◽  
Invasive Techniques ◽  
Fast Variation

AbstractInfluence of backstreaming ions from the target on spot size of focused 2 MeV electron beam was considered. The 2D version of the particle-in-cell code KARAT was used to study the formation of the ions stream and dynamics of the electron beam. It was shown that light species emitted from the target can disrupt the beam. The emission of low-ionized states of tantalum cannot disrupt the beam during about 30 ns or longer. A few non-invasive techniques of mitigation of the beam disruption were considered. Final magnetic lens with fast variation of magnetic field of several hundred Ampere-turns per nanosecond is capable to stabilize initial spot size of the compressed beam at the target.

THE DETECTION PROBABILITY IMPROVEMENT OF THE FAR-SIDE CRACK ON THE HIGH LIFT-OFF USING THE MAGNETIC CAMERA

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4631-4636 ◽  
Author(s):  
JINYI LEE ◽  
JISEONG HWANG
Keyword(s):  
Magnetic Field ◽  
Crack Detection ◽  
Magnetic Lens ◽  
High Lift ◽  
Crack Volume ◽  
Detection Probabilities ◽  
Side Crack ◽  
Lift Off ◽  
Magnetic Camera ◽  
The Relationship

To evaluate cracks using magnetic flux leakage (MFL), the distribution of magnetic field (DMF) near the crack should be quantified. A narrow spatial resolution of DMF is demanded around the crack. Also the lift-off should increase over several mm to protect the sensors from environments such as high temperature, dust, and vibration. Furthermore, the MFL must be amplified to detect a far-side crack because the MFL will concentrate in the ferromagnetic specimen and will be weak. The magnetic camera and magnetic lens could be useful for high lift-off conditions such as in nondestructive testing of a far-side environment. The far-side crack detection probabilities, Max(∂B/∂x) and RMS(∂B/∂x), were improved by about 20~60% by using the magnetic lens. The crack can be easily detected by using the 1/4RMS algorithm. Finally, an equation that expresses the relationship between the volume of crack and Max(∂B/∂x) is proposed. This equation is based on the principle that the magnetic field is inversely proportional to the square of the lift-off and is useful for determining the crack volume when the lift-off is known.

Magnetic lens effect using Gd-Ba-Cu-O bulk superconductor in very high magnetic field

2012 ◽  
Vol 111 (7) ◽  
pp. 07E728 ◽  
Author(s):  
Seyong Choi ◽  
Jang-Hee Yoon ◽  
Byoung-Seob Lee ◽  
Mi-Sook Won ◽  
Jung-Woo Ok ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Bulk Superconductor ◽  
Magnetic Lens ◽  
Lens Effect ◽  
Very High

scholarly journals Nanoscale magnetic field imaging for 2D materials

2021 ◽  
Author(s):  
Estefani Marchiori ◽  
Lorenzo Ceccarelli ◽  
Nicola Rossi ◽  
Luca Lorenzelli ◽  
Christian L. Degen ◽  
...  
Keyword(s):  
Magnetic Field ◽  
2D Materials ◽  
Magnetic Field Imaging ◽  
Field Imaging

Detection Probability Improvement for Nondestructive Evaluation Using a Magnetic Camera

2006 ◽  
Vol 306-308 ◽  
pp. 241-246 ◽  
Author(s):  
Jin Yi Lee ◽  
Ji Seoung Hwang ◽  
Se Ho Choi ◽  
Jae Kyoo Lim
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Nondestructive Evaluation ◽  
Magnetic Fluid ◽  
Probability Of Detection ◽  
Magnetic Method ◽  
Magnetic Lens ◽  
3 Dimensional ◽  
Lift Off ◽  
Magnetic Camera

It is important to estimate the intensity distribution of a magnetic field as a possible magnetic method in an industrial nondestructive evaluation application. A magnetic camera provides the distribution of a quantitative magnetic field with homogeneous lift-off and same spatial resolution. Magnetic flux leakage near a crack on the specimen can be amplified by using a 3- dimensional magnetic fluid, that is to say a magnetic lens. This study introduces the experimental consideration of the effects of magnetic lenses for concentrating of magnetic flux. The experimental results showed that the magnetic fluid has a sufficient lens effect for magnetic camera and effect of improvement in probability of detection.

Magnetic-field strengths from optical polarization data

1967 ◽  
Vol 31 ◽  
pp. 381-383
Author(s):  
J. M. Greenberg
Keyword(s):  
Magnetic Field ◽  
Optical Polarization ◽  
Polarization Data ◽  
Term Model ◽  
Source Of Information ◽  
Field Strengths

Van de Hulst (Paper 64, Table 1) has marked optical polarization as a questionable or marginal source of information concerning magnetic field strengths. Rather than arguing about this–I should rate this method asq+-, or quarrelling about the term ‘model-sensitive results’, I wish to stress the historical point that as recently as two years ago there were still some who questioned that optical polarization was definitely due to magnetically-oriented interstellar particles.

Observing the galactic magnetic field

1967 ◽  
Vol 31 ◽  
pp. 375-380
Author(s):  
H. C. van de Hulst
Keyword(s):  
Magnetic Field ◽  
Fair Agreement ◽  
Solar Neighbourhood ◽  
Galactic Magnetic Field ◽  
The Magnetic Field

Various methods of observing the galactic magnetic field are reviewed, and their results summarized. There is fair agreement about the direction of the magnetic field in the solar neighbourhood:l= 50° to 80°; the strength of the field in the disk is of the order of 10-5gauss.

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