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

Sadrara, Mahdiyeh; Miri, MirFaez

doi:10.1038/s41598-018-35833-2

Cited by 4 publications

(5 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

“…It is important for practical applications to be able to create the so-called magnetic hot spots in free space. 42 Due to structuring, the total magnetic field in the gaps can be enhanced (comparing to the Magnetic hot-spots are also useful for spectroscopy, 48 better enhancement of Raman scattering, fluorescence and circular dichroism of molecules, 49 sensing 50 and other applications.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic Octupole Response of Dielectric Quadrumers

Terekhov

Evlyukhin

Redka

et al. 2020

Laser & Photonics Reviews

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Magnetic Octupole Response of Dielectric Quadrumers

Terekhov

Evlyukhin

Redka

et al. 2020

Laser & Photonics Reviews

View full text Add to dashboard Cite

show abstract

“…Sadrara et al demonstrated hollow InSb microspheres forming dimers and trimers. Electric and magnetic hotspots in the gap between microspheres can be obtained, where electric field intensity enhancements of 10-2880 and magnetic field intensity enhancements of 3-61 in the frequency window 0.35-1.50 THz [52].…”

Section: Treatment Of Biomedical Samplementioning

confidence: 99%

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

et al. 2020

View full text Add to dashboard Cite

With the non-ionizing, non-invasive, high penetration, high resolution and spectral fingerprinting features of terahertz (THz) wave, THz spectroscopy has great potential for the qualitative and quantitative identification of key substances in biomedical field, such as the early diagnosis of cancer, the accurate boundary determination of pathological tissue and non-destructive detection of superficial tissue. However, biological samples usually contain various of substances (such as water, proteins, fat and fiber), resulting in the signal-to-noise ratio (SNR) for the absorption peaks of target substances are very small and then the target substances are hard to be identified. Here, we present recent works for the SNR improvement of THz signal. These works include the usage of attenuated total reflection (ATR) spectroscopy, the fabrication of sample-sensitive metamaterials, the utilization of different agents (including contrast agents, optical clearing agents and aptamers), the application of reconstruction algorithms and the optimization of THz spectroscopy system. These methods have been proven to be effective theoretically, but only few of them have been applied into actual usage. We also analyze the reasons and summarize the advantages and disadvantages of each method. At last, we present the prospective application of THz spectroscopy in biomedical field.

show abstract

“…presented MO measurement of several samples of InSb with different carriers and carrier concentrations for low external magnetic field and room temperatures. With these advantages, dimers and trimers of InSb particles have been studied to enhance THz spectroscopy by forming electric and magnetic hotspots in the gap between them (Bakker et al, 2015;Sadrara and Miri, 2019). Anisotropic materials like InSb in OM would make it strongly dependent on the beam combinations, allowing for countless possibilities (Roichman et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Numerical study of magneto-optical binding between two dipolar particles under illumination by two counter-propagating waves

Abraham-Ekeroth

2023

Front. Nanotechnol.

View full text Add to dashboard Cite

Introduction: The formation of a stable magneto plasmonic dimer with THz resonances is theoretically studied for the principal directions of the system. Unlike a recent report, our work provides a complete description of the full photonic coupling for arbitrary magnetic fields as, for instance, unbalanced particle spins.Methods: As an illustration, we consider two small, n-doped InSb nanoparticles under illumination by two counter-propagating plane waves.Results: Remarkably, when an external magnetic field exists, the symmetry in the system is broken, and a resonant radiation pressure for the dimer appears. Similarly, tunable inter-particle forces and spins are exerted on the non-reciprocal dimer. The system is also characterized when the magnetic field is absent. Moreover, we show how the mechanical observables truly characterize the dimer since their resonance dependency contains detailed information about the system.Discussion: Unlike far-field observables like absorption, mechanical magnitudes depend on the system's near-field. In addition, the nature of the particle spins is originally explained by the energy flow's behavior around the dimer. This work constitutes a generalization of any previous approach to optical binding between small nanoparticles. It paves the way for fully controlling optical matter and nano factory designs based on surface plasmon polaritons.

show abstract

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

Cited by 4 publications

References 52 publications

Magnetic Octupole Response of Dielectric Quadrumers

Magnetic Octupole Response of Dielectric Quadrumers

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

Numerical study of magneto-optical binding between two dipolar particles under illumination by two counter-propagating waves

Contact Info

Product

Resources

About