# Using highly uniform and smooth Selenium colloids as low-loss magnetodielectric building blocks of optical metafluids

## TL;DR

This paper explores the use of highly uniform selenium colloids as low-loss magnetodielectric building blocks for optical metafluids, demonstrating their potential for directional light scattering and fluidic optical antennas.

## Contribution

It is the first systematic analysis of selenium colloids' magnetodielectric resonances for optical metafluid applications, highlighting their uniformity and high refractive index.

## Key findings

- Observed Kerker-type directional light scattering from Se colloids.
- Se colloids exhibit high-refractive-index and structural uniformity.
- Potential for fluidic low-loss optical antennas via spin-coating and painting.

## Abstract

We systematically analyzed magnetodielectric resonances of Se colloids for the first time to exploit the possibility for use as building blocks of all-dielectric optical metafluids. By taking synergistic advantages of Se colloids, including (i) high-refractive-index at optical frequencies, (ii) unprecedented structural uniformity, and (iii) versatile access to copious quantities, the Kerker-type directional light scattering resulting from efficient coupling between strong electric and magnetic resonances were observed directly from Se colloidal suspension. Thus, the use of Se colloid as a generic magnetodielectric building block highlights an opportunity for the fluidic low-loss optical antenna, which can be processed via spin-coating and painting.

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Source: https://tomesphere.com/paper/1704.02829