Abstract
AbstractMetasurfaces promise to replace bulky prisms and lenses with 2D surfaces, revolutionizing wavefront control with technologically significant advantages in size, weight, and planar fabrication. However, conventional implementations suffer from large chromatic aberrations and cannot sustain performance over practical bandwidths of real‐world signals because of the limited phase modulation margin available in a surface. How can an infinitely thin surface generate the arbitrarily large, broadband phase delay that bulk phase accumulation can provide? Here, equivalence between bulk optics and certain multiresonant metasurfaces is demonstrated, where phase delay arises from trains of multiple resonances in the effective sheet conductivities of the surface itself instead of accumulation of propagation phase. The fundamentally required electromagnetic surface conductivities of a purely achromatic metasurface are derived and general design rules for arbitrarily broadband beam steering and lensing are obtained. Both operation in transmission and reflection can be achieved in a unified way by proper alignment of the resonances, enabling 360° directionality. The arbitrary spectral bandwidth, dual reflection/transmission operation, and complete dispensability of propagation phase constitute a major advance in the state of the art of achromatic metasurfaces for wavefront manipulation.
Highlights
Metasurfaces promise to replace bulky prisms and lenses with 2D surfaces, revolutionizing wavefront control with technologically significant advantages in size, weight, and planar fabrication
They can impose infinitely thin surface generate the arbitrarily large, broadband phase delay a nontrivial phase discontinuity on an that bulk phase accumulation can provide? Here, equivalence between bulk optics and certain multiresonant metasurfaces is demonstrated, where phase delay arises from trains of multiple resonances in the effective sheet conductivities of the surface itself instead of accumulation of propagation impinging electromagnetic wave
Www.advopticalmat.de be favorable over an actual refractive optical component which suffers from chromatic dispersion and chromatic aberrations due to the refractive index changing with frequency, that is, material dispersion
Summary
Metasurfaces promise to replace bulky prisms and lenses with 2D surfaces, revolutionizing wavefront control with technologically significant advantages in size, weight, and planar fabrication. Equivalence between bulk optics and certain multiresonant metasurfaces is demonstrated, where phase delay arises from trains of multiple resonances in the effective sheet conductivities of the surface itself instead of accumulation of propagation impinging electromagnetic wave Modulating this phase discontinuity along the metasurface unlocks the possibility of performing wavefront manipulation operations such as steering, focusing, phase. Koschny Ames Laboratory—U.S DOE and Department of Physics and Astronomy single-plane-wave scattering, it fails to perform well for realworld signals such as modulated beams, pulses, and optical readouts, which necessarily have significant temporal and spatial bandwidth This shortcoming is because such metasurfaces function based on the phase delay arising from the scattering. We derive general design rules for achieving achromatic steering and lensing operations based on implementing multiple electric and magnetic Lorentzian resonances on a single surface. This is markedly different from recent attempts to cover operation in the entire space by either relying on different polarization states for reflection and transmission, respectively,[24,25] or performing the operation for different wavelengths.[26]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
