Plasmonic nanostructures for local field enhancement in the UV region

• Published in: Photonics and nanostructures Vol. 12; no. 1; pp. 2 - 8
• Main Authors: Shalin, A.S., Sukhov, S.V., Krasnok, A.E., Nikitov, S.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2014
• Subjects: Dielectrics; Electromagnetic fields; Local field enhancement; Mathematical models; Nanostructure; Plasmonic nanostructures; Plasmonics; Plasmons; Ultraviolet; Wave propagation; Wavelengths; Ultraviolet; Plasmonic nanostructures; Local field enhancement
• ISSN: 1569-4410; 1569-4429
• DOI: 10.1016/j.photonics.2013.08.004

•We describe an ultraviolet subwavelength focusing in plasmonic nanoantennas.•We proposed the metalized V-groove in a dielectric host, providing enhancement coefficient ∼25 at the wavelength of 350nm.•Subwavelength focusing is achieved by means of two different mechanisms.•The first one is the plasmon wave propagation along the surface of a metal film.•The second one is the transfer of an electromagnetic wave through a dielectric medium. In this work we describe an ultraviolet subwavelength focusing in plasmonic nanostructures. A system which provides a 20–25 times local field enhancement at a wavelength of 350nm is proposed. This system represents a metalized V-shaped groove in a surface of a dielectric medium. Subwavelength focusing is achieved by a plasmon wave propagation along the surface of metal film and by the transfer of electromagnetic field through the dielectric medium. The influence of system parameters on a local field enhancement is investigated. A simplified model that allows for determining the geometric parameters of an optimized resonator is proposed.