Open AccessFabry-Perot description for Mie resonances of rectangular dielectric nanowire optical resonators
Author(s) -
Patrick Landreman,
Hamidreza Chalabi,
Junghyun Park,
Mark L. Brongersma
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.029760
Subject(s) - optics , resonator , refractive index , dielectric , nanowire , whispering gallery wave , fabry–pérot interferometer , waveguide , materials science , resonance (particle physics) , total internal reflection , reflection (computer programming) , coupled mode theory , optoelectronics , physics , laser , particle physics , computer science , programming language
We show that a dielectric nanowire (NW) with a rectangular cross section can effectively be modeled as a Fabry-Perot cavity formed by truncating a dielectric slab waveguide. By calculating the mode indices of the supported waveguide modes and the reflection phase pickup of the guided waves from the end facets, we can numerically predict the spectral locations of optical, Mie-like resonances for such NWs. This type of analysis must be performed twice in order to account for all resonances of these structures, corresponding to light propagating in the vertical or horizontal directions. The model shows excellent agreement with full-field simulations. We show how the refractive index of both the NW itself and neighboring materials and substrates impact the resonant properties. Our results can aid the development of NW-based optoelectronic devices, for which rectangular cross sections are much simpler to fabricate using top-down fabrication procedures.