Compound Metaoptics for Amplitude and Phase Control of Wavefronts

Abstract

Metasurfaces allow tailored control over electromagnetic wavefronts. However, due to the local conservation of power flow, a passive, lossless, and reflectionless metasurface is limited to imparting phase discontinuities -- and not power density discontinuities -- onto a wavefront. Here, we show how the phase and power density profiles of a wavefront can be independently controlled using two closely-spaced, phase-discontinuous metasurfaces. The two metasurfaces, each designed to exhibit specific refractive properties, are separated by a wavelength-scale distance and together form a compound metaoptic. A systematic design procedure is presented, which allows transformation between arbitrary complex-valued field distributions without reflection, absorption, or active components. Such compound metaoptics may find applications in optical trapping of particles, displaying three-dimensional holographic images, shrinking the size of optical systems, or producing custom (shaped and steered) far-field radiation patterns.

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• Fast and Accurate Optimization of Metasurfaces with Gradient Descent and the Woodbury Matrix Identity
• Multiple actions of time-resolved short-pulsed metamaterials
• Field Synthesis with Azimuthally-Varying, Cascaded, Cylindrical Metasurfaces using a Wave Matrix Approach
• Programmable metasurfaces for future photonic artificial intelligence
• Lossless, Complex-Valued Optical Field Control with Compound Metaoptics
• Electrically Thick Fabry-Pérot Omega Bianisotropic Metasurfaces as Virtual Anti-Reflective Coatings and Non-Local Field Transformers
• Multifunctional Meta-Optic Systems: Inversely Designed with Artificial Intelligence
• Experimental Demonstration of A Dual-Input/Dual-Output Reflective Impedance Metasurface
• Reconfigurable-Metasurface-Aided Multi-State Generalized Polarization-Space Modulation for Next-Generation Wireless Communications
• Arbitrary Wave Transformations with Huygens' Metasurfaces through Surface-Wave Optimization