scholarly journals Anisotropic Purcell Factor Control of an Emitter in Graphene Under the Modulation of a Static Magnetic Field

2021 ◽  
Author(s):  
Zenghong Ma ◽  
Zijian Chen ◽  
Lian Zhang ◽  
Xiaocui Lu ◽  
Jian Xu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spontaneous Emission ◽  
Static Magnetic Field ◽  
Applied Magnetic Field ◽  
Great Promise ◽  
Polarization Angle ◽  
Polarization Direction ◽  
Purcell Factor ◽  
Order Of Magnitude ◽  
Definition Of

Abstract Spontaneous emission control of emitters hold great promise for applications in pho-tonics and quantum optics. As a definition of the spontaneous emission lifetime of an atom or molecule, the Purcell factor of an emitter coupled with graphene plasmons by a static magnetic field is studied. The results show that the Purcell factor can be effectively modulated by the applying of external magnetic field to graphene at lower terahertz frequencies. In addition, in the presence of a magnetic field, the coupling between the graphene and emitter becomes stronger, which results in a strong enhancement of the emission of the emitter and the numerically calculated Purcell factor is increased. More specifically, the Purcell factor increases by almost an order of magnitude when the applied magnetic field is 10T. Moreover, the Purcell factor also depends on the polarization direction of the emitter, especially when the polarization direction of the emitter is parallel to the graphene plane, the Purcell factor will show anisotropy with the change of polarization angle. Bias of the applied magnetic field extends a new path for the realization of Purcell factor modulation based on graphene-emitter interaction, it may provides a promising application value for the design of the photo-magnetic based quantum devices.

Electromagnetic damping of elastic waves: a simple theory

1970 ◽  
Vol 7 (5) ◽  
pp. 1304-1307 ◽  
Author(s):  
F. E. M. Lilley ◽  
C. M. Carmichael
Keyword(s):  
Magnetic Field ◽  
Electrical Conductivity ◽  
Analytical Solution ◽  
Applied Magnetic Field ◽  
Elastic Waves ◽  
Magnetic Field Gradient ◽  
Magnitude Estimate ◽  
Simple Expression ◽  
Electromagnetic Damping ◽  
Order Of Magnitude

An order-of-magnitude estimate is made to check the effect observed in previously described experiments in which vibrations in a metal bar were damped by an applied magnetic field that was strongly non-uniform. Though the awkward geometry of the experiment has prevented an accurate analytical solution of the problem, some reasonable assumptions allow a simple expression for the effect to be obtained directly. This expression is in agreement with the experimental results regarding the dependence of the effect upon frequency, bar dimensions, density, electrical conductivity, and magnetic field gradient.

scholarly journals Purcell effect in Tamm plasmon structures with QD emitter

2018 ◽  
Vol 52 (4) ◽  
pp. 467
Author(s):  
A.R. Gubaydullin ◽  
C. Symonds ◽  
J. Bellessa ◽  
K.A. Ivanov ◽  
E.D. Kolykhalova ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Plasmon Mode ◽  
Bragg Reflector ◽  
Silver Layer ◽  
Spontaneous Emission Rate ◽  
Distributed Bragg Reflector ◽  
Purcell Factor ◽  
Inas Quantum Dots ◽  
Order Of Magnitude ◽  
Quantization Formalism

AbstractWe study Tamm plasmon structure based on GaAs/Al_0.95GaAs distributed Bragg reflector covered by thin silver layer, with active area formed by InAs quantum dots. We have measured the spectral and angular characteristics of photoluminescence and performed theoretical calculation of the spontaneous emission rate (modal Purcell factor) in the structure by using S-quantization formalism. We show that for Tamm plasmon mode the spontaneous emission can be enhanced by more than an order of magnitude, despite absorption in metallic layer.

Decreased chemotaxis of human peripheral phagocytes exposed to a strong static magnetic field

2004 ◽  
Vol 91 (1) ◽  
pp. 59-65 ◽  
Author(s):  
S Sipka ◽  
I Szöllősi ◽  
Gy Batta ◽  
Gy Szegedi ◽  
Á Illés ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Static Magnetic Field

Intense Static Magnetic Field Induced Bone Growth in Vivo

1984 ◽  
Vol 3 (1) ◽  
pp. 223-234
Author(s):  
Frank Papatheofanis ◽  
Bill Fapatheofanls ◽  
Robert Ray
Keyword(s):  
Magnetic Field ◽  
Static Magnetic Field ◽  
Bone Growth

High Resolution Current Imaging by Direct Magnetic Field Sensing

2003 ◽  
Author(s):  
S.I. Woods ◽  
Nesco M. Lettsome ◽  
A.B. Cawthorne ◽  
L.A. Knauss ◽  
R.H. Koch
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Spatial Resolution ◽  
Great Promise ◽  
Magnetoresistive Sensor ◽  
Magnetic Sensitivity ◽  
Current Lines ◽  
Scanning Squid ◽  
Scanning Fiber ◽  
Ferromagnetic Probe

Abstract Two types of magnetic microscopes have been investigated for use in high resolution current mapping. The scanning fiber/SQUID microscope uses a SQUID sensor coupled to a nanoscale ferromagnetic probe, and the GMR microscope employs a nanoscale giant magnetoresistive sensor. Initial scans demonstrate that these microscopes can resolve current lines less than 10 µm apart with edge resolution of 1 µm. These types of microscopes are compared with the performance of a standard scanning SQUID microscope and with each other with respect to spatial resolution and magnetic sensitivity. Both microscopes show great promise for identifying current defects in die level devices.

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