Open AccessStudy of thermoplasmonic properties of gold nanodimer in visible -infrared region of electromagnetic spectrum
Author(s) -
Nilesh Kumar Pathak,
Partha Sarathi
Publication year - 2021
Publication title -
nano express
Language(s) - English
Resource type - Journals
ISSN - 2632-959X
DOI - 10.1088/2632-959x/ac37b1
Subject(s) - plasmon , surface plasmon resonance , infrared , materials science , absorption (acoustics) , wavelength , resonance (particle physics) , molecular physics , electromagnetic field , surface plasmon , localized surface plasmon , electromagnetic spectrum , visible spectrum , optics , atomic physics , optoelectronics , chemistry , physics , nanotechnology , nanoparticle , quantum mechanics
In the present study, the heat generation in gold nanodimer when irradiated at their localized surface plasmon resonances is investigated numerically. The theoretical calculations are performed employing the first principal approach to obtain the absorption cross-section of gold nanodimer for different parameter ranges. The heating mechanism is enumerated in terms of its temperature by solving the steady-state heat transfer equation which depends on the absorption cross-section and surface plasmon resonance wavelength. These surface plasmon resonances are quite sensitive to the distance between the dimer and have been tuned from visible to IR range by managing the distance between spheres from 0 to 6 nm. The computation of normalized electric field distribution of gold nanodimer under the plasmon resonance has been mapped using boundary element method(BEM) which enables visualization of the local hot spot that plays a significant role in optical heating applications. The work furnishes the basic understanding of the heating mechanism of gold nanodimer which can find application as plasmonic nanoheaters in several branches of science in visible and near-infrared regions of the electromagnetic spectrum.