Abstract
This work elaborates on the high scattering which dielectric nanorods exhibit and how it can be exploited to control light propagation across material interfaces. A detailed overview of how dielectric nanorods interact with light through a combination of dipolar scattering and leaky modes is performed via outward power flux calculations. We establish and account for design parameters that best result in light magnification owing to resonant behavior of nanorods. Impact of material parameters on scattering and their dispersion have been calculated to establish that low loss dielectric oxides like ZnO when nanostructured show excellent antenna like resonances which can be used to control light coupling and propagation. Interfacial scattering calculations demonstrate the high forward directivity of nanorods for various dielectric interfaces. A systematic analysis for different configurations of single and periodic nanorods on air dielectric interface emphasizes the light coupling tendencies exhibited by nanorods to and from a dielectric. Spatial characteristics of the localized field enhancement of the nanorod array on an air dielectric interface show focusing attributes of the nanorod array. We give a detailed account to tailor and selectively increase light propagation across an interface with good spectral and spatial control.
Highlights
This work elaborates on the high scattering which dielectric nanorods exhibit and how it can be exploited to control light propagation across material interfaces
In this work we started with a single dielectric nanorod and illustrated how it interacts with light for a given material and geometry
Optical properties of a periodic nanorod array across different air-dielectric interfaces indicate the influence of the nanorod on the spectral transmission and reflections which can be controlled by selecting nanorods of suitable materials and geometry[44]
Summary
This work elaborates on the high scattering which dielectric nanorods exhibit and how it can be exploited to control light propagation across material interfaces. Spherical dielectric nanoparticles have been of interest due to Mie resonances which they exhibit and have proven to increase light control and localization upon integration with optoelectronic devices[23] The limitation of these small particles is that they do not offer strong directivity[24,25,26,27]. Materials typically used in this configuration are transparent conductive oxides which help providing localised light enhancement in solar cells as well as function as electric contacts[17, 31] Most of these oxides have a low loss and a relatively high refractive index. It is important in order to have an elaborate understanding of how exactly light interacts with such nanorods and establish a link between the governing parameters This would aid in designing nanorod based structures that help in controlling light across a given set of interface optical parameters for different optoelectronic devices. We investigate how these properties change when the refractive index of the surrounding material (nsurr) is changed from air to a dielectric, Fig. 1(d)
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call