Electrically driven metal and all-dielectric nanoantennas for plasmon polariton excitation. (March 2020)

• Record Type: Journal Article
• Authors: Dvoretckaia, Liliia; Ladutenko, Konstantin; Mozharov, Alexey; Zograf, George; Bogdanov, Andrey; Mukhin, Ivan
• Is Part Of: Journal of quantitative spectroscopy & radiative transfer. Volume 244(2020)
• Publication Date: 2020-03
• Subjects: inelastic electron tunneling -- photon generation -- plasmon polariton excitation -- optical nanoantennas -- plasmonic -- STM; Spectrum analysis -- Periodicals; Radiation -- Periodicals; Analyse spectrale -- Périodiques; Rayonnement -- Périodiques; Radiation; Spectrum analysis; Periodicals; 543.0858
• DOI: 10.1016/j.jqsrt.2019.106825
• Languages: English
• ISSNs: 0022-4073

Abstract

Highlights: SPP launch is enhanced by a spherical metal (au) or all-dielectric (Si) nanoantenna. Spectral position of peak efficiency is related to Mie resonances of nanoantennas. The enhancement originates from electric dipole and electric quadrupole modes. The peak value of the energy conversion efficiency reaches up to 25%. Abstract: In order to design a viable nanoplasmonic device it is essential to be able to control the excitation of plasmon polaritons using an external voltage bias. To achieve this we can employ the phenomenon of electron inelastic tunneling followed by photon excitation and a subsequent launch of the plasmon polariton. Unfortunately, this process suffers from low efficiency. In this paper, we propose the use of spherical Si and Au nanoantennas to increase the energy conversion from photon to plasmon. We show that size-governed Mie resonances of nanoantenna determine the spectral position of peak efficiency. The size of the nanoantenna also determines the efficiency value, which can reach up to 25%. This is an order of magnitude higher compared to the case without nanoantenna. An analysis of thermal stability proves that both types of nanoantennas can operate under high current rates at room temperature.