Highly confined surface plasmon polaritons in the ultraviolet region

E.D. Chubchev, I.A. Nechepurenko, A.V. Dorofeenko, A.P. Vinogradov, A.A. Lisyansky
2018 Optics Express  
We study a surface plasmon polariton mode that is strongly confined in the transverse direction and propagates along a periodically nanostructured metal-dielectric interface. We show that the wavelength of this mode is determined by the period of the structure, and may therefore, be orders of magnitude smaller than the wavelength of a plasmon-polariton propagating along a flat surface. This plasmon polariton exists in the frequency region in which the sum of the real parts of the permittivities
more » ... the permittivities of the metal and dielectric is positive, a frequency region in which surface plasmon polaritons do not exist on a flat surface. The propagation length of the new mode can reach a several dozen wavelengths. This mode can be observed in materials that are uncommon in plasmonics, such as aluminum or sodium.
doi:10.1364/oe.26.009050 pmid:29715863 fatcat:4hi3erxqargihdsq5k45bopl2m