Abstract
Controlling the phase distribution of wavefronts using optical metasurfaces has led to interesting optical properties and applications. Here, we explore the control of phase distribution through polar-dielectric metasurfaces composed of doped SiC nanosphere arrays. We investigate the impact of doping concentration on the optical properties of SiC nano-spheres. Our results indicate that increasing the doping of SiC nanoparticles influenced electric dipolar resonances, whereas it did not change the dipolar resonances. Using this concept, we numerically studied the extension of this idea to form metasurface arrays of single, dimer and linear trimers of the doped SiC nano-spheres. Using different doping schemes, we studied the improvement of the reflectivity at frequencies greater than the longitudinal optical phonon frequency.
Highlights
One well-known conventional method of shaping nanoparticles is elongation in which the nanoparticles with the same material properties can resonate at different localized surface plasmon resonance (LSPR) frequencies [30]
We show that by tailoring the phase distribution of a metasurface, the reflection spectrum can be improved for frequencies greater than ωLO
In this study, using the finite-difference time-domain (FDTD) method, we investigated the interaction of the plasmons and the optical phonon vibration of the crystalline nanoparticles composed of polar dielectrics
Summary
Optical metasurfaces, composed of metallic resonators, demonstrate exotic optical properties such as bandpass [1,2] bandstop [3,4,5,6,7] frequency selection, right/left handed circular polarizability [8,9,10,11,12], linear to circular conversion [13,14,15,16], conical beam patterning [17,18,19], focused transmission and reflection [20,21,22,23] and flat lensing behaviors [24,25,26,27]. The idea of controlling the phase fronts is well known by changing the LSPR of metallic nanoparticles through shaping them While this idea has been explored in plasmonic [21] and dielectric [27] metasurfaces, it has not been studied in the THz regime with thermomechanically stable materials, such as SiC. Instead of shaping the SiC nanoparticles to control phase fronts, a novel method of increasing the carrier concentrations of spherical nanoparticles Using this phase control, we demonstrate that high reflection can be achieved using SiC surfaces. In this study, using Mie theory and according to the interaction of the plasmons and the optical phonon vibration of the crystalline nanoparticles composed of polar dielectrics, first we show that the localized surface resonances can be controlled by doping a spherical nanoparticle. We study the improved reflectivity at the frequencies greater than the longitudinal optical phonon frequency
Sign-in/Register to view highlights & summary 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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
