Physics

Lens (geology)

Chip

Bandwidth (computing)

Gene

Optics

Metamaterial

Wavefront

Chemistry

Scattering

Materials science

Transformation (genetics)

Computer science

Transformation optics

Optoelectronics

Biochemistry

Telecommunications

Nature Communications

Metasurfaces can be programmed for a spatial transformation of the wavefront, thus allowing parallel optical signal processing on-chip within an ultracompact dimension. On-chip metasurfaces have been implemented with two-dimensional periodic structures, however, their inherent scattering loss limits their large-scale implementation. The scattering can be minimized in single layer high-contrast transmitarray (HCTA) metasurface. Here we demonstrate a one-dimensional HCTA based lens defined on a standard silicon-on-insulator substrate, with its high transmission (&lt;1 dB loss) maintained over a 200 nm bandwidth. Three layers of the HCTAs are cascaded for demonstrating meta-system functionalities of Fourier transformation and differentiation. The meta-system design holds potential for realizing on-chip transformation optics, mathematical operations and spectrometers, with applications in areas of imaging, sensing and quantum information processing.

On-chip wavefront shaping with dielectric metasurface