Title: Using highly uniform and smooth Selenium colloids as low-loss magnetodielectric building blocks of optical metafluids,
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.