Abstract
Rational design of the structure enables metamaterials to go beyond the
ingredients and achieve unprecedented material properties. However,
the realization of complicated and anisotropic electromagnetic
parameters relies on the elaborate design of building blocks, and the
mutual coupling between the anisotropic responses makes precise
control of material parameters even more difficult. Here, we propose a
metal–dielectric hybrid metamaterial, not only realizing the
decoupling between anisotropic electromagnetic responses, but also
establishing a one-to-one correspondence between independent geometric
dimensions and anisotropic parameter components. Moreover, a tuning
theoretical paradigm applied to an anisotropic and resonant system is
further suggested, which proves that the operating frequency of this
hybrid metamaterial can be easily adjusted by changing external
fields. As prototypes, two typical and tunable microwave meta-devices,
a transformation-optics cloak and a frequency splitter, are
constructed with Ba–Sm–La–Ti ferroelectric
ceramic and flexible printed circuit board, which successfully
demonstrate our proposed design theory. This work provides a simple
strategy for the design and fabrication of tunable anisotropic
metamaterials, and boost the development of meta-devices toward
practical application.
Funder
National Natural Science Foundation of
China
Subject
Atomic and Molecular Physics, and Optics