Magnetic and electric hotspots via fractal clusters of hollow silicon nanoparticles

Naeimi, Zahra; Miri, MirFaez

doi:10.1364/ol.43.000462

Cited by 7 publications

(3 citation statements)

References 27 publications

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“…Strong local magnetic fields can be used to control or detect small quantum objects (quantum dots, atoms, and molecules) supporting magnetic optical transitions. [ 50 ] Magnetic hot‐spots are also useful for spectroscopy, [ 51 ] better enhancement of Raman scattering, fluorescence, and circular dichroism of molecules, [ 52 ] sensing, [ 53 ] and other applications.…”

Section: Resultsmentioning

confidence: 99%

Magnetic Octupole Response of Dielectric Quadrumers

Terekhov

Evlyukhin

Redka

et al. 2020

Laser & Photonics Reviews

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The development of new approaches to tuning the resonant magnetic response of simple all‐dielectric nanostructures is very important in modern nanophotonics. Here, it is shown that a resonant magnetic octupole (MOCT) response can be obtained by dividing a solid rectangular silicon block to a quadrumer structure with the introduction of narrow gaps between four nanocubes. The spectral position of the MOCT resonance is controlled and tuned by varying the distance between the nanocubes. It is demonstrated that several magnetic hot‐spots related to the MOCT resonance can be located in the gaps creating a strong magnetic field gradient in free space. It is observed that the resonant excitation of the MOCT moment leads to a significant enhancement of light absorption in the system at the spectral region, where light absorption in bulk silicon is weak. The results of this work can be applied to design new composite antennas and metamaterials based on complex building blocks, energy harvesting devices, and molecular trapping with magnetic hot‐spots.

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Section: Resultsmentioning

confidence: 99%

Magnetic Octupole Response of Dielectric Quadrumers

Terekhov

Evlyukhin

Redka

et al. 2020

Laser & Photonics Reviews

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“…In particular, it is shown that fractal clusters of hollow silicon nanoparticles provide both electric and magnetic hotspots. In the wavelength window 400–750 nm, electric field intensity enhancements of 10–400 and magnetic field intensity enhancements of 10–3790 are reported 35 .…”

Section: Introductionmentioning

confidence: 97%

“…Electric and magnetic hotspots provided by dimers and trimers of solid 28,29 and hollow nanoparticles 30 may find application in single molecule experiments. Hotspots provided by disordered and fractal aggregates of nanoparticles are also studied 31–35 . In particular, it is shown that fractal clusters of hollow silicon nanoparticles provide both electric and magnetic hotspots.…”

Section: Introductionmentioning

confidence: 99%

Electric and Magnetic Hotspots via Hollow InSb Microspheres for Enhanced Terahertz Spectroscopy

Sadrara¹,

Miri²

2019

Sci Rep

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We study electric and magnetic hotspots in the gap between hollow InSb microspheres forming dimers and trimers. The outer radius, core volume fraction, distance, and temperature of the microspheres can be chosen to achieve field enhancement at a certain frequency corresponding to the transition between energy levels of a molecule placed in the gap. For example, utilizing 80 μ m radius spheres at a gap of 2 μ m held at a temperature of 295 K, allow electric field intensity enhancements of 10–2880 and magnetic field intensity enhancements of 3–61 in the frequency window 0.35–1.50 THz. The core volume fraction and the ambient temperature affect the enhancements, particularly in the frequency window 1.5–2 THz. Electric and magnetic hotspots are promising for THz absorption and circular dichroism spectroscopy.

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