Details
| Original language | English |
|---|---|
| Article number | 1800037 |
| Journal | Laser and Photonics Reviews |
| Volume | 12 |
| Issue number | 9 |
| Publication status | Published - 14 Aug 2018 |
| Externally published | Yes |
Abstract
Fano resonances are observed in the near-field electric-field spectra of dielectric particles sustaining magnetic dipole resonances and located in the vicinity of a conductive surface (reflector). The polarity of these Fano resonances is defined by the relative positions of the resonant particle, the observation points, and the reflector. This paper studies two cases corresponding to common near-field measurement techniques, where the electric field is detected by aperture-based probes and scattering probes. In the first case, as the particle moves away from the reflector, the polarity of the observed Fano resonance reverses every quarter-of-a-wavelength of the particle's magnetic resonance. In the second case, in addition to the periodic change of polarity, a phase shift of π is detected between the fields detected at the opposite sides of the resonant particle. This work proves, theoretically, that the observed Fano resonance polarities arise due to the interference between the external electric-field standing wave and the resonant fields generated by the particle's magnetic dipole moment. The findings are supported by a recent terahertz experiment and the gigahertz experiment presented in this paper.
Keywords
- dielectric resonators, Fano near-field, magnetic dipoles, microwaves, terahertz
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Laser and Photonics Reviews, Vol. 12, No. 9, 1800037, 14.08.2018.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Polarity of the Fano Resonance in the Near-Field Magnetic-Dipole Response of a Dielectric Particle Near a Conductive Surface
AU - Khromova, Irina
AU - Sayanskiy, Andrey
AU - Uryutin, Andrey
AU - Evlyukhin, Andrey B.
N1 - Funding information: The development of the theoretical model was supported by the Russian Science Foundation, Grant No. 16-12-10287. The experimental near-field study was supported by the Russian Science Foundation, Grant No. 17-79-20379. A.B.E. acknowledges financial support from the Deutsche Forschungsgemeinschaft (DFG) EV-220/2-1. The authors thank S. Glybovski for the assistance in the microwave experiments and P. Kapi-tanova for useful discussions.
PY - 2018/8/14
Y1 - 2018/8/14
N2 - Fano resonances are observed in the near-field electric-field spectra of dielectric particles sustaining magnetic dipole resonances and located in the vicinity of a conductive surface (reflector). The polarity of these Fano resonances is defined by the relative positions of the resonant particle, the observation points, and the reflector. This paper studies two cases corresponding to common near-field measurement techniques, where the electric field is detected by aperture-based probes and scattering probes. In the first case, as the particle moves away from the reflector, the polarity of the observed Fano resonance reverses every quarter-of-a-wavelength of the particle's magnetic resonance. In the second case, in addition to the periodic change of polarity, a phase shift of π is detected between the fields detected at the opposite sides of the resonant particle. This work proves, theoretically, that the observed Fano resonance polarities arise due to the interference between the external electric-field standing wave and the resonant fields generated by the particle's magnetic dipole moment. The findings are supported by a recent terahertz experiment and the gigahertz experiment presented in this paper.
AB - Fano resonances are observed in the near-field electric-field spectra of dielectric particles sustaining magnetic dipole resonances and located in the vicinity of a conductive surface (reflector). The polarity of these Fano resonances is defined by the relative positions of the resonant particle, the observation points, and the reflector. This paper studies two cases corresponding to common near-field measurement techniques, where the electric field is detected by aperture-based probes and scattering probes. In the first case, as the particle moves away from the reflector, the polarity of the observed Fano resonance reverses every quarter-of-a-wavelength of the particle's magnetic resonance. In the second case, in addition to the periodic change of polarity, a phase shift of π is detected between the fields detected at the opposite sides of the resonant particle. This work proves, theoretically, that the observed Fano resonance polarities arise due to the interference between the external electric-field standing wave and the resonant fields generated by the particle's magnetic dipole moment. The findings are supported by a recent terahertz experiment and the gigahertz experiment presented in this paper.
KW - dielectric resonators
KW - Fano near-field
KW - magnetic dipoles
KW - microwaves
KW - terahertz
UR - http://www.scopus.com/inward/record.url?scp=85052557719&partnerID=8YFLogxK
U2 - 10.1002/lpor.201800037
DO - 10.1002/lpor.201800037
M3 - Article
AN - SCOPUS:85052557719
VL - 12
JO - Laser and Photonics Reviews
JF - Laser and Photonics Reviews
SN - 1863-8880
IS - 9
M1 - 1800037
ER -