Ultrastrong Purcell enhancement of magnetic dipole emission based on quasi-BIC

Here, we propose a hollow quasi-periodic spoof plasmonic structure to realize the ultrastrong Purcell enhancement of magnetic dipole emission in terahertz frequency range based on quasi-bound states in the continuum. By independently tuning the substructures, we can severally tune the responses of t...

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Bibliographic Details
Published in:The European physical journal. D, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2022-11, Vol.76 (11), Article 211
Main Authors: Cheng, Shu-Ling, Wu, Hong-Wei, Yin, Yun-Qiao
Format: Article
Language:English
Subjects:
Applications of Nonlinear Dynamics and Chaos Theory
Atomic
Brightening
Charged particles
Composite structures
Electric dipoles
Fano resonance
Frequency ranges
Grooves
Interference
Magnetic dipoles
Magnetic resonance
Magnetism
Molecular
Optical and Plasma Physics
Periodic structures
Physical Chemistry
Physics
Physics and Astronomy
Plasmonics
Q factors
Quadrupoles
Quantum Information Technology
Quantum Physics
Regular Article – Optical Phenomena and Photonics
Spectroscopy/Spectrometry
Spintronics
Spontaneous emission
Terahertz frequencies
Tuning
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Summary:Here, we propose a hollow quasi-periodic spoof plasmonic structure to realize the ultrastrong Purcell enhancement of magnetic dipole emission in terahertz frequency range based on quasi-bound states in the continuum. By independently tuning the substructures, we can severally tune the responses of the electric dipole and quadripolar modes supported by groove-substructure, and the magnetic dipolar mode supported in slit-substructure. In particular, we also observe a whispering gallery mode supported by the composite structure, which will move with changing structural parameters. When the magnetic dipole mode close to the whispering gallery mode, the interference between them will emerge to generates a quasi-bound state in the continuum with ultra-high quality factor. Then, based on the quasi-periodic structure, we put a magnetic dipole into the hollow structure center and realize the ultrastrong Purcell enhancement of magnetic dipole emission, which can be more than 10 5 . The designed structure can be applied to a variety of magneto-optical devices to greatly enhance Purcell effect in terahertz region. Graphical Abstract Manipulating the spontaneous emission rate of magnetic dipole with artificial magnetic resonators have been widely investigated to provide the road toward novel magnetic light-matter interactions. However, the emission strength of magnetic dipole still an open challenge due to the lack of high-quality factor cavity with magnetic dipole resonance. Here, we propose a hollow quasi-periodic spoof plasmonic structure to realize the ultrastrong Purcell enhancement of magnetic dipole emission in terahertz frequency range based on quasi-BIC as shown in (a). By independently tuning the substructures, we can severally tune the responses of the electric dipole and quadripolar modes supported by groove-substructure, and the magnetic dipolar mode supported in slit-substructure. Particularly, when the magnetic dipole close to the electric quadrupole, the interference between the magnetic dipolar mode as a bright one and electric quadrupolar modes as a dark one in the quasi-structure can generate a sharp Fano resonance with high quality factor. When we put a magnetic dipole into the structure center and realize the ultrastrong Purcell enhancement of magnetic dipole emission, which can be more than 10 5 as Figure (b). The designed structure can be applied to a variety of magneto-optical devices to greatly enhance magnetic Purcell effect in terahertz regio
ISSN:1434-6060
1434-6079
DOI:10.1140/epjd/s10053-022-00543-y