Optical Antenna-Resonator Based on a Metallic Prolate Spheroidal Nanoparticle
| Authors | A.V. Korotun1 , 2 , V.P. Kurbatsky1, H.V. Moroz1, R.Yu. Korolkov1, N.M. Nagorna1 |
| Affiliations |
1Zaporizhzhia Polytechnic National University, 69063 Zaporizhzhia, Ukraine 2G.V. Kurdyumov Institute for Metal Physics, N.A.S. of Ukraine, 03142 Kyiv, Ukraine |
| Е-mail | andko@zp.edu.ua |
| Issue | Volume 18, Year 2026, Number 3 |
| Dates | Received 20 March 2026; revised manuscript received 14 June 2026; published online 26 June 2026 |
| Citation | A.V. Korotun1,2, V.P. Kurbatsky, et al., J. Nano- Electron. Phys. 18 No 3, 03030 (2026) |
| DOI | https://doi.org/10.21272/jnep.18(3).03030 |
| PACS Number(s) | 42.60.By, 73.20.Mf, 84.40.Ba |
| Keywords | Optical nanoantenna, Nanoresonator, Lightning rod coefficient and efficiency, Electric field amplification, Quality factor, Purcell factor. |
| Annotation |
The antenna and resonator characteristics of prolate spheroidal metallic nanoparticles are investigated. The operating principle of an optical nanoscale antenna is discussed. The relationship between the antenna and resonator properties of metallic nanoparticles is established. The frequency and size dependences of the field longitudinal enhancement, quality factor, Purcell factor, and spontaneous emission-resonator coupling factor are obtained, as well as the size dependences of the lightning rod coefficient, efficiency, longitudinal surface plasmon resonance frequency, and spontaneous emission rate change. Relationships are established linking these quantities, which indicate a close relation between the characteristics of nanoscale optical antennas and nanoresonators. The behavior of the maxima in the frequency dependences of the field longitudinal enhancement and Purcell factor with varying eccentricity of a spheroidal nanoparticle is described. It is shown that with increasing particle eccentricity (approaching a cylindrical shape), the lightning rod coefficient, efficiency, and spontaneous emission rate change increase. At the same time, the longitudinal surface plasmon resonance frequency decreases, moving from the near ultraviolet to the optical (for particles of some metals – to the infrared) range. It is established that in the limiting case of a particle of infinite length, the lightning rod coefficient becomes infinitely large. A close relationship was discovered between the antenna and resonator properties of spheroidal nanoparticles, confirmed by the spontaneous emission-resonator coupling factor being close to unity in the infrared and visible spectral regions. It is established that an increase in the surface area-to-volume ratio of nanoparticles with a decrease in their size leads to a decrease in the efficiency and an increase in the spontaneous emission rate change. In addition, with an increase in the size (lengths of the semi-axes) of nanoparticles, an increase in the longitudinal component of the quality factor tensor is observed. |
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List of References |
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