Improved strong field enhancement and ultranarrow perfect absorption based on anapole mode in slotted Si nanodisk metamaterial

He, Mengyue; Wang, Junqiao; Sun, Shikun; Mao, Yu; Li, Ran; Tian, Shuo; Taqi, M. Munib ul Hassan Noor ul; Liang, Erjun

doi:10.1016/j.rinp.2022.105809

Cited by 18 publications

(13 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, scientists are striving to find low loss alternatives to noble metal structures, and one promising approach is to explore Mie resonance of dielectric particles. Later, researchers discovered that high refractive index dielectric particles, such as nanoscale silicon rods, provide potential solutions for material loss issues [26][27][28]. This dielectric metamaterial supports the electric dipole and magnetic dipole responses due to Mie resonance, displacement current replaces the conduction current and is not easy to produce losses [29,30].…”

Section: Introductionmentioning

confidence: 99%

Analog electromagnetic induced transparency of T-type Si-based metamaterial and its applications

He,

Wang,

Zhang

et al. 2024

Phys. Scr.

Self Cite

View full text Add to dashboard Cite

A T-type silicon-based metamaterial is proposed, which realizes electromagnetically induced transparency (EIT) by using the asymmetry of its structure. This dielectric metamaterial exhibits an ultranarrow EIT transparent window, with a transmittance of 91% and a Q factor of 180. Measuring its sensing performance, a refractive index sensor with a sensitivity of 466 nm/RIU is obtained. In addition, by analyzing the dispersion characteristics of the structure, the maximum group delay value is 2.84ps, and the corresponding group refractive index is 4250. Therefore, dielectric metamaterials with this structure are expected to be used in refractive index sensing and slow light devices.

show abstract

Section: Introductionmentioning

confidence: 99%

Analog electromagnetic induced transparency of T-type Si-based metamaterial and its applications

He,

Wang,

Zhang

et al. 2024

Phys. Scr.

Self Cite

View full text Add to dashboard Cite

show abstract

“…In recent years, research in anapole states is gaining momentum, and such states are widely explored in dielectric nanostructures. − In such kinds of structures, upon excitation with plane waves, the net magnetic dipole (MD) moment becomes zero owing to the asymmetric distribution of the magnetic field. By structural optimization, the electric dipole (ED) moment can be suppressed by destructively interfering with the electric toroidal dipole (ETD), hence giving rise to the well-explored “electric anapole” in high-refractive-index structures .…”

Section: Introductionmentioning

confidence: 99%

Finite-Element Method Simulations of the Tunable Magnetic Anapole State in an All-Graphene Metasurface: Implications for Near-Field Sensing, Nanoscale Optical Trapping, and Cloaking

Roy

Debnath

2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

In this article, we have proposed an all-graphene metasurface where the magnetic anapole state can be dynamically tuned. The structure is composed of two layers of graphene separated by a dielectric spacer on an oxide substrate, forming a gap surface plasmons resonator structure in the long-wavelength infrared region. The top graphene layer is patterned into interconnected disks, while the interconnection is for electrical tuning purposes only. By multipolar analysis using the finiteelement method (FEM) simulation, we have shown that at the particular dimension, the dominant electric dipole scattering can be minimized. This happens at the resonant point where along with the electric dipole suppression, the magnetic and magnetic toroidal dipoles destructively interfere, which gives rise to a magnetic anapole state. This resonant point can be tuned in two ways, either passively, which is the lithographical variation of structure parameters, or actively, by harnessing the chemical potential of the graphene. We have shown here both mechanisms whereby actively tuning we can shift the magnetic anapole to the far-infrared region. Through the interplay of multipole analysis, we have shown that by varying the angle of incidence, we can control the radiating channels, which can be termed an anapole switch. For the active tuning cases, by voltage mapping of the chemical potential, we have shown the effect of chemical potential on the components of the multipolar families. Our device concept and such implementations hold promise for the application in near-field sensing, nanoscale optical trapping, cloaking, etc.

show abstract

“…The fundamental physics of anapoles can be qualitatively explained by Mie theory [36,37], which identifies the conditions for the anapole state to occur when the scattering amplitudes are zero [38,39]. Because of their ability to suppress farfield scattering and enhance near-field effects, anapoles have diverse applications in fields such as optical cloaking [40], absorbers [41][42][43], sensors [44][45][46], nanolasers [47], photothermal effects [48], and nonlinear optical enhancements [49,50].…”

Section: Introductionmentioning

confidence: 99%

The anapole state excited by an oblique incidence

et al. 2023

Self Cite

View full text Add to dashboard Cite

Anapole states supported by high-refractive-index dielectric nanoparticles have mostly been studied under normal incidence, but this work explores the oblique incidence excitation. For a single silicon nanodisk, as the incident angle (θ) increases, the anapole wavelength undergoes a gradual blueshift, while the wavelength of maximum near-field enhancement remains almost unchanged with increasing E-field enhancement factor (|E/E0|) due to phase retardation effect caused by oblique incidence, and some unique features in field distributions differed from normal excitation are exhibited. In the case of a silicon nanodisk array, the anapole state and near-field enhancement are affected by near-field coupling and the phase retardation effect is weakened. With increasing θ, the anapole wavelength and maximum field enhancement wavelength both blue shift. The y-direction coupling occurs in anapole wavelength and diagonal direction coupling occurs in the maximum field enhancement wavelength. Oblique incident excitation gives us a deeper understanding of anapole state and may have potential applications in nanophotonics.

show abstract

Improved strong field enhancement and ultranarrow perfect absorption based on anapole mode in slotted Si nanodisk metamaterial

Cited by 18 publications

References 50 publications

Analog electromagnetic induced transparency of T-type Si-based metamaterial and its applications

Analog electromagnetic induced transparency of T-type Si-based metamaterial and its applications

Finite-Element Method Simulations of the Tunable Magnetic Anapole State in an All-Graphene Metasurface: Implications for Near-Field Sensing, Nanoscale Optical Trapping, and Cloaking

The anapole state excited by an oblique incidence

Contact Info

Product

Resources

About