Article

Article

Curr. Appl. Phys. 2020; 20(12): 1335-1341

Published online December 31, 2020 https://doi.org/10.1016/j.cap.2020.09.001

Copyright © The Korean Physical Society.

Influence of cavity geometry towards plasmonic gap tolerance and respective near-field in nanoparticle-on-mirror

Devaraj V., Lee J.-M., Oh J.-W.

Research Center for Energy Convergence and Technology Division, Pusan National University, Busan, 46241, South Korea; Department of Nanoenergy Engineering, Pusan National University, Busan, 46241, South KoreaDevaraj, V., Research Center for Energy Convergence and Technology Division, Pusan National University, Busan, 46241, South Korea; Lee, J.-M., Research Center for Energy Convergence and Technology Division, Pusan National University, Busan, 46241, South Korea; Oh, J.-W., Research Center for Energy Convergence and Technology Division, Pusan National University, Busan, 46241, South Korea, Department of Nanoenergy Engineering, Pusan National University, Busan, 46241, South Korea

Correspondence to:Oh, J.-W.
Research Center for Energy Convergence and Technology Division, Pusan National UniversitySouth Korea
email: ojw@pusan.ac.kr

Abstract

In this work, we emphasize the importance of cavity geometry along with nanoparticle shape and plasmonic nanogap (based on a nanoparticle on a metallic film (NPOM) design) which plays significant role in understanding the complex plasmonic mode characteristics involving nanoparticle and gap mode resonances. The cross-section imprint of planar cavity on metallic film plays decisive role in near field enhancement properties at similar NP size and plasmonic nanogap conditions for spherical and cubical NPOM systems. By mimicking the NPOM structure to metal-insulator-metal design, we understand the resonant emission differences for the respective plasmonic modes. Influence of dominant and weaker gap mode resonances resulted in an interesting optical behavior (fluctuations in near field enhancement strength) in NP mode in case of cubical nanostructures. By such extensive investigation and interpretation of sub-wavelength complex plasmonic mode characteristics, various practical applications in plasmonics field can be accomplished. © 2020 Korean Physical Society

Keywords: Nano-particle-on-mirror, Nanoparticle, Near field enhancement, Plasmonic modes, Simulations

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