Dispersion-corrected metasurface for beam deflector and flat lens

In this paper, a reconfigurable metasurface is realized using microfluidic technology, which controls the amplitude and phase of the incident wave at sub-wavelength resolution. A dispersion-corrected beam deflector and a flat lens are demonstrated for proof-of-principle where the flat lens and beam deflector are tuned, in response to the change of the incident wavelength, to maintain their functionalities. This will make various applications such as on-chip spectrometers, high-performance dispersion-controllable devices in the next-generation telecommunication networks, and wavefront-tunable devices.