Coupling and thermosplasmonic properties of asymmetric hexagonal nanoframes

Abstract

The interaction of light with asymmetric nanostructures leads to the coupling of plasmon modes. Understanding the nature and tunability of these hybridized plasmon modes is essential for both fundamental studies and the development of new applications. Herein, we systematically examine these coupled plasmon modes and heat generated by the asymmetric hexagonal nanoframes dimers (HNDs). Our results show that there are three plasmon bands in the examined wavelength. One of these bands is related to the coupled plasmon modes, which can be actively controlled by changing the height of nanoparticles. These coupled plasmon modes originate from the interaction of dipoles with a minimum splitting energy of 170 meV. Moreover, the thermoplasmonic studies show that the temperature of the asymmetric HNDs strongly depends on the coupling of nanoframes which shows great promise for highly sensitive thermal imaging.