Dielectric Nanorod Scattering and its Influence on Material Interfaces

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.

Improvement of Terahertz Photoconductive Antenna using Optical Antenna Array of ZnO Nanorods

“…According to Mangalgiri et al . 33 theoretical study, low dielectric NRs like ZnO have high scattering ability and show excellent antenna like resonances when nanostructured. This property can be used to couple the 800 nm laser pulse to LT-GaAs layer.…”

Conformable Nanowire-in-Nanofiber Hybrids for Low-Threshold Optical Gain in the Ultraviolet

“…26,39 Internal ordering of NWs within each polymer filament impacts on ASE properties, enhancing them as better detailed in the following. Indeed, the alignment of NWs is expected to minimize the propagation losses for radiation guided along the longitudinal axis of the hybrid fibers, because of the dominant forward component 27,28 of light-scattering at the ZnO/polymer interface ( Figure S6) thus promoting waveguiding.…”

“…In addition, these hybrids can lead to the definition of design rules for miniaturized lasers, bio- and chemical sensors, and optical networks embedding UV-emitting materials and nanocomponents. Indeed, the optical gain in the hybrid system incorporating elongated NPs can benefit from having them aligned in electrospun polymers, promoting enhanced forward scattering, , and channeling photons along the longitudinal axis of the fibers. The latest applications benefiting from the advanced combination of properties of NW-in-fibers include wearable components for healthcare monitoring and biometric recognition and devices for optogenetics, photochemical cross-linking of proteins, localized calcium imaging, and immunological modulation. − …”

Генерация Второй Гармоники От Тонкого Цилиндрического Слоя. I. Аналитическое Решение

“…Генерации второй гармоники от поверхности частиц сферической формы посвящено уже достаточно много публикаций, поэтому растет интерес к нелинейным эффектам от частиц более сложной формы [10] для их последующего исследования, так как форма поверхности частицы оказывает непосредственное влияние на ее свойства. В качестве примера можно привести использование именно цилиндрических диэлектрических частиц для реализации возможности контролируемого распространения света через границы раздела [17]. В медицине таким примером может служить многократный рост эффективности препарата для лечения рака молочной железы при доставке к раковым клеткам с помощью стержнеобразных и даже червеобразных наночастиц [18].…”