scholarly journals Multipolar-sensitive engineering of magnetic dipole spontaneous emission with a dielectric nanoresonator antenna

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mojtaba Karimi Habil ◽  
Carlos J. Zapata–Rodríguez ◽  
Mauro Cuevas ◽  
Samad Roshan Entezar
Keyword(s):  
Spherical Shell ◽  
Magnetic Dipole ◽  
Spontaneous Emission ◽  
Critical Analysis ◽  
Metallic Substrate ◽  
Purcell Factor ◽  
Taper Angle ◽  
Resonant Coupling ◽  
Tapered Angle ◽  
Novel Strategy

AbstractWe propose an axisymmetric silicon nanoresonator with designed tapered angle well for the extraordinary enhancement of the decay rate of magnetic dipole (MD) emitters. Due to the resonant coupling of a MD emitter and the MD mode of the subwavelength resonator, the Purcell factor (PF) can easily reach 500, which is significantly higher than the PF when using a silicon nanosphere of the same size. The PF and the resonance frequency are conveniently tuned through the resonator diameter and the taper angle of the blind hole. When supported by a metallic substrate, further enhancement ($$>10^3$$ > 10 3 ) of the MD spontaneous emission is triggered by an image-induced quadrupolar high-Q mode of the nanoantenna. For the sake of comparison we include a critical analysis of the canonical problem that considers a Si spherical shell. Our results might facilitate a novel strategy for promising realizations of chip-scale nanophotonic applications.

Investigation the dynamic of nano quantum cascade lasers with optoelectronics feedback

2021 ◽  
Vol 2 (2) ◽  
pp. 48-56
Author(s):  
Akram Ghani Mohammed ◽  
Hussein Hadi Waried
Keyword(s):  
Spontaneous Emission ◽  
Emission Factor ◽  
Quantum Cascade Lasers ◽  
Photon Number ◽  
Small Variation ◽  
Equation Model ◽  
Purcell Factor ◽  
Quantum Cascade ◽  
Spontaneous Emission Factor ◽  
Cascade Lasers

In this paper, a theoretical investigation of negative optoelectronic feedback study in Nano quantum cascade lasers is presented. The present rate equation model has been modified to include the nano laser factors such as the Purcell factor and the spontaneous emission factor. The results indicate that the present rate equation model can be using to study the effect of Purcell factor and the spontaneous emission factor on the negative optoelectronic feedback in Nano quantum cascade lasers. It is found that the increase in Purcell factor value leads to increase in photon number and decrease the carrier number in all quantum states. Also, the dynamic of photon number (S) tends to stable at constant value with the increase of Purcell effect i.e. there is small variation in photon number and carrier number( , , ). The decreases in enhanced spontaneous emission factor value leads to increases in carrier number and decreases the photon number and we note small variation in these values.

scholarly journals Metasurfaces with Electric Quadrupole and Magnetic Dipole Resonant Coupling

ACS Photonics ◽  
2018 ◽  
Vol 5 (5) ◽  
pp. 2022-2033 ◽  
Author(s):  
Viktoriia E. Babicheva ◽  
Andrey B. Evlyukhin
Keyword(s):  
Magnetic Dipole ◽  
Electric Quadrupole ◽  
Resonant Coupling

scholarly journals Second harmonic generation in metasurfaces with multipole resonant coupling

Nanophotonics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 3545-3556 ◽  
Author(s):  
Aoxue Han ◽  
Colm Dineen ◽  
Viktoriia E. Babicheva ◽  
Jerome V. Moloney
Keyword(s):  
Second Harmonic Generation ◽  
Magnetic Dipole ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Electric Quadrupole ◽  
Nanoparticle Arrays ◽  
Resonant Coupling ◽  
Plasmonic Nanoparticle ◽  
Fundamental Wavelength ◽  
Linear Resonance

AbstractWe report on the numerical demonstration of enhanced second harmonic generation (SHG) originating from collective resonances in plasmonic nanoparticle arrays. The nonlinear optical response of the metal nanoparticles is modeled by employing a hydrodynamic nonlinear Drude model implemented into Finite-Difference Time-Domain (FDTD) simulations, and effective polarizabilities of nanoparticle multipoles in the lattice are analytically calculated at the fundamental wavelength by using a coupled dipole–quadrupole approximation. Excitation of narrow collective resonances in nanoparticle arrays with electric quadrupole (EQ) and magnetic dipole (MD) resonant coupling leads to strong linear resonance enhancement. In this work, we analyze SHG in the vicinity of the lattice resonance corresponding to different nanoparticle multipoles and explore SHG efficiency by varying the lattice periods. Coupling of electric quadrupole and magnetic dipole in the nanoparticle lattice indicates symmetry breaking and the possibility of enhanced SHG under these conditions. By varying the structure parameters, we can change the strength of electric dipole (ED), EQ, and MD polarizabilities, which can be used to control the linewidth and magnitude of SHG emission in plasmonic lattices. Engineering of lattice resonances and associated magnetic dipole resonant excitations can be used for spectrally narrow nonlinear response as the SHG can be enhanced and controlled by higher multipole excitations and their lattice resonances. We show that both ED and EQ–MD lattice coupling contribute to SHG, but the presence of strong EQ–MD coupling is important for spectrally narrow SHG and, in our structure, excitation of narrow higher-order multipole lattice resonances results in five times enhancement.

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.

Modifying magnetic dipole spontaneous emission with nanophotonic structures

2017 ◽  
Vol 11 (3) ◽  
pp. 1600268 ◽  
Author(s):  
Denis G. Baranov ◽  
Roman S. Savelev ◽  
Sergey V. Li ◽  
Alexander E. Krasnok ◽  
Andrea Alù
Keyword(s):  
Magnetic Dipole ◽  
Spontaneous Emission ◽  
Nanophotonic Structures
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