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Applied Science and Convergence Technology

Published online April 18, 2022

Copyright © The Korean Vacuum Society.

Incorporating the substrate effect into polariton dispersion of waveguided nanocavity

Jang-Won Kang 1* , Jung Hoon Song 1

Mokpo National University

Correspondence to:kangjw@mnu.ac.kr

Received: March 22, 2022; Revised: March 26, 2022; Accepted: April 18, 2022

Abstract

We report on the rational pathway to produce the exciton-polariton dispersion in a hexagonal cylinder-type waveguide of ZnO nanorod using the coupled oscillator model (COM). The multiple peaks from the end emission of nanorod were treated as lower polariton (LP) eigenmodes with energy and momentum spacing on the E‒ kz relation. To calculate the dispersion curve satisfying the LP eigenmodes, the effective mode dispersion, as a photon contribution of COM, was calculated by finite-difference time-domain (FDTD) method, considering the realistic experiment situation such as hexagonal cylinder-type nanocavity lying on the SiO2/Si substrate. The FDTD results show that the dielectric surrounding, such as the SiO2 substrate, can result in a relative loss of the mode profile. However, the effective mode dispersion provides a more realistic way to study the polariton feature in the hexagonal cylinder-type waveguide, rather than the ideal cylindrical waveguide theory excluding the substrate effect, finally leading to a realistic route to calculate the E‒ kz dispersion in the ZnO nanocavity.

Keywords: Waveguide, ZnO nanorod, Exciton-polariton, Polariton dispersion

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