  In recent years, dielectric rod based metasurface lenses have been
particularly investigated for their potential applications in replacing the
traditional bulky lens with high efficiency. However, the isolated granular
structure may lead to robustness and chromatic aberration concerns. In this
work, a low refractive-index embedding medium was applied to solve the
structural stability problem that also enables the device to be transferable to
desired position or surface. Based on this, a compound metasurface lens
composed of randomly interleaved frequency-selective zone sectors is proposed
to broaden the bandwidth of the two-dimensional device. The validities of the
proposed method and the application potentials for the multifunctional lens
that can manipulate RGB three colors have been numerically examined and
verified. The current results are of essence in guiding the future design of
metasurface lenses for real practice.
