Research Article Investigations of Optical Coulomb Blockade Oscillations in Plasmonic Nanoparticle Dimers Lamessa Gudata, 1 Jule Leta Tesfaye, 1,2 Abela Saka, 1 R. Shanmugam, 3 L. Priyanka Dwarampudi, 4 Nagaraj Nagaprasad , 5 B. Stalin , 6 and Ramaswamy Krishnaraj 2,7 1 Department of Physics, College of Natural and Computational Science, Dambi Dollo University, Ethiopia 2 Centre for Excellence-Indigenous Knowledge, Innovative Technology Transfer and Entrepreneurship, Dambi Dollo University, Ethiopia 3 TIFAC, CORE-HD, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Ooty, Nilgiris, Tamil Nadu, India 4 Department of Pharmacognosy, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Ooty, Nilgiris, Tamil Nadu, India 5 Department of Mechanical Engineering, ULTRA College of Engineering and Technology, Madurai, 625104 Tamil Nadu, India 6 Department of Mechanical Engineering, Anna University, Regional Campus Madurai, Madurai, 625 019 Tamil Nadu, India 7 Department of Mechanical Engineering, College of Engineering and Technology, Dambi Dollo University, Ethiopia Correspondence should be addressed to Ramaswamy Krishnaraj; prof.dr.krishnaraj@dadu.edu.et Received 11 November 2021; Accepted 21 December 2021; Published 15 January 2022 Academic Editor: Bharath Govindan Copyright © 2022 Lamessa Gudata et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The exploration of Coulomb blockade oscillations in plasmonic nanoparticle dimers is the subject of this study. When two metal nanoparticles are brought together at the end of their journey, tunnelling current prevents an infinite connection dipolar plasmon and an infinite amplification in the electric fields throughout the hot spot in between nanoparticles from occurring. One way to think about single-electron tunnelling through some kind of quantum dot is to think about Coulomb blockage oscillations in conductance. The electron transport between the dot and source is considered. The model of study is the linear conductance skilled at describing the basic physics of electronic states in the quantum dot. The linear conductance through the dot is defined as G = lim ⟶0 ðI /V Þ in the limit of infinity of small bias voltage. We discuss the classical and quantum metallic Coulomb blockade oscillations. Numerically, the linear conductance was plotted as a function gate voltage. The Coulomb blockade oscillation occurs as gate voltage varies. In the valleys, the conductance falls exponentially as a function gate voltage. As a result of our study, the conductance is constant at high temperature and does not show oscillation in both positive and negative gate voltages. At low temperature, conductance shows oscillation in both positive and negative gate voltages. 1. Introduction Classical electromagnetism forecasts an infinite of the red- shift hybridized noble metal nanoparticle plasmon polariton. The surface-to-surface distance approaches zero when there is a rapid increase in the field strength between the hotspot of two metallic nanopatrticles. One theory holds that quan- tum mechanical tunnelling of electrons prevents either type of deviations [1]. Additionally, the tunnelling current mini- mizes the accumulation of charge opposing surfaces. As a result, decreases in the electric field strength within the hot- spot result in a seamless transition from either the dipolar bonding plasmon to the charge transfer plasmon. A high degree of agreement exists between quantum mechanical theories and experimental results [2]. Quantum tunnelling accounts for the vast majority of the optical response of cou- ples of plasmonic nanoparticles along within close proximity [3]. Recently, tunnelling of electrons in quantum plasmonics Hindawi International Journal of Photoenergy Volume 2022, Article ID 7771607, 6 pages https://doi.org/10.1155/2022/7771607