Influence of Spatial Dispersion on the Electromagnetic Properties of Magnetoplasmonic Nanostructures
Magnetoplasmonics based on composite nanostructures is widely used in many biomedical applications. Nanostructures, consisting of a magnetic core and a gold shell, exhibit plasmonic properties, that allow the concentration of electromagnetic energy in ultra-small volumes when used, for example, in i...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-12-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/11/12/3297 |
| _version_ | 1797502006974218240 |
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| author | Yuri Eremin Vladimir Lopushenko |
| author_facet | Yuri Eremin Vladimir Lopushenko |
| author_sort | Yuri Eremin |
| collection | DOAJ |
| description | Magnetoplasmonics based on composite nanostructures is widely used in many biomedical applications. Nanostructures, consisting of a magnetic core and a gold shell, exhibit plasmonic properties, that allow the concentration of electromagnetic energy in ultra-small volumes when used, for example, in imaging and therapy. Magnetoplasmonic nanostructures have become an indispensable tool in nanomedicine. The gold shell protects the core from oxidation and corrosion, providing a biocompatible platform for tumor imaging and cancer treatment. By adjusting the size of the core and the shell thickness, the maximum energy concentration can be shifted from the ultraviolet to the near infrared, where the depth of light penetration is maximum due to low scattering and absorption by tissues. A decrease in the thickness of the gold shell to several nanometers leads to the appearance of the quantum effect of spatial dispersion in the metal. The presence of the quantum effect can cause both a significant decrease in the level of energy concentration by plasmon particles and a shift of the maxima to the short-wavelength region, thereby reducing the expected therapeutic effect. In this study, to describe the influence of the quantum effect of spatial dispersion, we used the discrete sources method, which incorporates the generalized non-local optical response theory. This approach made it possible to account for the influence of the nonlocal effect on the optical properties of composite nanoparticles, including the impact of the asymmetry of the core-shell structure on the energy characteristics. It was found that taking spatial dispersion into account leads to a decrease in the maximum value of the concentration of electromagnetic energy up to 25%, while the blue shift can reach 15 nm. |
| first_indexed | 2024-03-10T03:26:44Z |
| format | Article |
| id | doaj.art-cc728dd284724158bba42893c5518545 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T03:26:44Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-cc728dd284724158bba42893c55185452023-11-23T09:50:39ZengMDPI AGNanomaterials2079-49912021-12-011112329710.3390/nano11123297Influence of Spatial Dispersion on the Electromagnetic Properties of Magnetoplasmonic NanostructuresYuri Eremin0Vladimir Lopushenko1Department of Computational Mathematics and Cybernetics, Moscow Lomonosov State University, 119991 Moscow, RussiaDepartment of Computational Mathematics and Cybernetics, Moscow Lomonosov State University, 119991 Moscow, RussiaMagnetoplasmonics based on composite nanostructures is widely used in many biomedical applications. Nanostructures, consisting of a magnetic core and a gold shell, exhibit plasmonic properties, that allow the concentration of electromagnetic energy in ultra-small volumes when used, for example, in imaging and therapy. Magnetoplasmonic nanostructures have become an indispensable tool in nanomedicine. The gold shell protects the core from oxidation and corrosion, providing a biocompatible platform for tumor imaging and cancer treatment. By adjusting the size of the core and the shell thickness, the maximum energy concentration can be shifted from the ultraviolet to the near infrared, where the depth of light penetration is maximum due to low scattering and absorption by tissues. A decrease in the thickness of the gold shell to several nanometers leads to the appearance of the quantum effect of spatial dispersion in the metal. The presence of the quantum effect can cause both a significant decrease in the level of energy concentration by plasmon particles and a shift of the maxima to the short-wavelength region, thereby reducing the expected therapeutic effect. In this study, to describe the influence of the quantum effect of spatial dispersion, we used the discrete sources method, which incorporates the generalized non-local optical response theory. This approach made it possible to account for the influence of the nonlocal effect on the optical properties of composite nanoparticles, including the impact of the asymmetry of the core-shell structure on the energy characteristics. It was found that taking spatial dispersion into account leads to a decrease in the maximum value of the concentration of electromagnetic energy up to 25%, while the blue shift can reach 15 nm.https://www.mdpi.com/2079-4991/11/12/3297magnetoplasmonicsdiscrete sources methodspatial dispersionnon-local optical response |
| spellingShingle | Yuri Eremin Vladimir Lopushenko Influence of Spatial Dispersion on the Electromagnetic Properties of Magnetoplasmonic Nanostructures Nanomaterials magnetoplasmonics discrete sources method spatial dispersion non-local optical response |
| title | Influence of Spatial Dispersion on the Electromagnetic Properties of Magnetoplasmonic Nanostructures |
| title_full | Influence of Spatial Dispersion on the Electromagnetic Properties of Magnetoplasmonic Nanostructures |
| title_fullStr | Influence of Spatial Dispersion on the Electromagnetic Properties of Magnetoplasmonic Nanostructures |
| title_full_unstemmed | Influence of Spatial Dispersion on the Electromagnetic Properties of Magnetoplasmonic Nanostructures |
| title_short | Influence of Spatial Dispersion on the Electromagnetic Properties of Magnetoplasmonic Nanostructures |
| title_sort | influence of spatial dispersion on the electromagnetic properties of magnetoplasmonic nanostructures |
| topic | magnetoplasmonics discrete sources method spatial dispersion non-local optical response |
| url | https://www.mdpi.com/2079-4991/11/12/3297 |
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