  We designed an on-chip transformative optic system of a metalens-photonic
crystal resonator metasystem on a foundry compatible silicon photonic platform.
By adjusting the on-chip metalens' focusing length and mode dimension, the
insertion loss between the metalens and the photonic crystal resonator and
waveguide structures are minimized through mode-matching. The micro-system does
not involve any single mode silicon nanowire waveguide, and thus mechanically
robust without any oxide claddings. The proposed microsystem is ideal for
miniaturized chemical and biosensors operating in air or solution environment.
