Near field spectral dispersion of dipole radiation: The maximum red and blue shifts, and the near and far field boundary
Spectral dispersion of dipole radiation in near field zone is studied. Spectral changes are demonstrated using polychromatic incident light of Gaussian spectral profile as test examples. Both red and blue shifts are possible. The maximum redshift can reach upon −20% of the original peak frequency ω0...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-12-01
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| Series: | Results in Optics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666950121001127 |
| _version_ | 1819006033514725376 |
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| author | Mufei Xiao |
| author_facet | Mufei Xiao |
| author_sort | Mufei Xiao |
| collection | DOAJ |
| description | Spectral dispersion of dipole radiation in near field zone is studied. Spectral changes are demonstrated using polychromatic incident light of Gaussian spectral profile as test examples. Both red and blue shifts are possible. The maximum redshift can reach upon −20% of the original peak frequency ω0. It is found that there is a boundary at r=0.175λ0 separates the red and blue shift zones. The dipole radiation can be decomposed in two parts, evanescent and propagating parts. The dispersion is studied for the whole radiation, as well as for evanescent and propagating parts. It is discovered that the boundary separates red and blue shift corresponds to the point where the propagating part becomes dominate. Therefore it is proposed to also call the boundary the near and far field boundary. In addition, the spectral changes are different for different dipole orientations, which can be essential for applications of near field antennas. |
| first_indexed | 2024-12-21T00:02:15Z |
| format | Article |
| id | doaj.art-15af018881d1430caff2346e3eb806e3 |
| institution | Directory Open Access Journal |
| issn | 2666-9501 |
| language | English |
| last_indexed | 2024-12-21T00:02:15Z |
| publishDate | 2021-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Optics |
| spelling | doaj.art-15af018881d1430caff2346e3eb806e32022-12-21T19:22:34ZengElsevierResults in Optics2666-95012021-12-015100166Near field spectral dispersion of dipole radiation: The maximum red and blue shifts, and the near and far field boundaryMufei Xiao0Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México km. 107 Carretera Tijuana-Ensenada, Ensenada, Baja California, CP 22860, MexicoSpectral dispersion of dipole radiation in near field zone is studied. Spectral changes are demonstrated using polychromatic incident light of Gaussian spectral profile as test examples. Both red and blue shifts are possible. The maximum redshift can reach upon −20% of the original peak frequency ω0. It is found that there is a boundary at r=0.175λ0 separates the red and blue shift zones. The dipole radiation can be decomposed in two parts, evanescent and propagating parts. The dispersion is studied for the whole radiation, as well as for evanescent and propagating parts. It is discovered that the boundary separates red and blue shift corresponds to the point where the propagating part becomes dominate. Therefore it is proposed to also call the boundary the near and far field boundary. In addition, the spectral changes are different for different dipole orientations, which can be essential for applications of near field antennas.http://www.sciencedirect.com/science/article/pii/S2666950121001127Spectral dispersion of dipole radiationRed and blue shifts of a Gaussian spectrumEvanescent and propagating field propagatorsNear and far field boundaryOrientation of near field antenna |
| spellingShingle | Mufei Xiao Near field spectral dispersion of dipole radiation: The maximum red and blue shifts, and the near and far field boundary Results in Optics Spectral dispersion of dipole radiation Red and blue shifts of a Gaussian spectrum Evanescent and propagating field propagators Near and far field boundary Orientation of near field antenna |
| title | Near field spectral dispersion of dipole radiation: The maximum red and blue shifts, and the near and far field boundary |
| title_full | Near field spectral dispersion of dipole radiation: The maximum red and blue shifts, and the near and far field boundary |
| title_fullStr | Near field spectral dispersion of dipole radiation: The maximum red and blue shifts, and the near and far field boundary |
| title_full_unstemmed | Near field spectral dispersion of dipole radiation: The maximum red and blue shifts, and the near and far field boundary |
| title_short | Near field spectral dispersion of dipole radiation: The maximum red and blue shifts, and the near and far field boundary |
| title_sort | near field spectral dispersion of dipole radiation the maximum red and blue shifts and the near and far field boundary |
| topic | Spectral dispersion of dipole radiation Red and blue shifts of a Gaussian spectrum Evanescent and propagating field propagators Near and far field boundary Orientation of near field antenna |
| url | http://www.sciencedirect.com/science/article/pii/S2666950121001127 |
| work_keys_str_mv | AT mufeixiao nearfieldspectraldispersionofdipoleradiationthemaximumredandblueshiftsandthenearandfarfieldboundary |