Multiplexing multiple yet distinct functionalities in one single device is highly desired for modern integration optics,but conventional devices are usually of bulky sizes and/or low efficiencies.While recently propos...Multiplexing multiple yet distinct functionalities in one single device is highly desired for modern integration optics,but conventional devices are usually of bulky sizes and/or low efficiencies.While recently proposed metasurfaces can be ultrathin and highly efficient,functionalities multiplexed by metadevices so far are typically restricted to two,dictated by the number of independent polarization states of the incident light.Here,we propose a generic approach to design metadevices exhibiting wave-control functionalities far exceeding two,based on coherent wave interferences continuously tuned by varying the incident polarization.After designing a series of building-block metaatoms with optical properties experimentally characterized,we construct two metadevices based on the proposed strategy and experimentally demonstrate their polarization-tuned multifunctionalities at the wavelength of 1550 nm.Specifically,upon continuously modulating the incident polarization along different paths on the Poincare’s sphere,we show that the first device can generate two spatially non-overlapping vortex beams with strengths continuously tuned,while the second device can generate a vectorial vortex beam carrying continuously-tuned polarization distribution and/or orbital angular momentum.Our proposed strategy significantly expands the wave-control functionalities equipped with a single optical device,which may stimulate numerous applications in integration optics.展开更多
Silicon is a common material of choice for semiconductor optics in the infrared spectral range,due to its low cost,well-developed high-volume manufacturing methods,high refractive index,and transparency.It is,however,...Silicon is a common material of choice for semiconductor optics in the infrared spectral range,due to its low cost,well-developed high-volume manufacturing methods,high refractive index,and transparency.It is,however,typically ill-suited for applications in the visible range,due to its large absorption coefficient,especially for green and blue light.Counterintuitively,we demonstrate how ultra-thin crystalline meta-optics enable full-color imaging in the visible range.For this purpose,we employ an inverse design approach,which maximizes the volume under the broadband modulation transfer function of the meta-optics.Beyond that,we demonstrate polarization-multiplexed functionality in the visible.This is particularly important as polarization optics require high index materials,a characteristic often difficult to obtain in the visible.展开更多
基金National Key Research and Development Program of China(Grant No.2022YFA1404701)National Natural Science Foundation of China(Grant Nos.12221004,62192771)Natural Science Foundation of Shanghai(Grant Nos.20JC141460,23DZ2260100)。
文摘Multiplexing multiple yet distinct functionalities in one single device is highly desired for modern integration optics,but conventional devices are usually of bulky sizes and/or low efficiencies.While recently proposed metasurfaces can be ultrathin and highly efficient,functionalities multiplexed by metadevices so far are typically restricted to two,dictated by the number of independent polarization states of the incident light.Here,we propose a generic approach to design metadevices exhibiting wave-control functionalities far exceeding two,based on coherent wave interferences continuously tuned by varying the incident polarization.After designing a series of building-block metaatoms with optical properties experimentally characterized,we construct two metadevices based on the proposed strategy and experimentally demonstrate their polarization-tuned multifunctionalities at the wavelength of 1550 nm.Specifically,upon continuously modulating the incident polarization along different paths on the Poincare’s sphere,we show that the first device can generate two spatially non-overlapping vortex beams with strengths continuously tuned,while the second device can generate a vectorial vortex beam carrying continuously-tuned polarization distribution and/or orbital angular momentum.Our proposed strategy significantly expands the wave-control functionalities equipped with a single optical device,which may stimulate numerous applications in integration optics.
基金supported by DARPA W31P4Q21C0043.Part of this work was conducted at the Washington Nanofabrication Facility/Molecular Analysis Facility,a National Nanotechnology Coordinated Infrastructure(NNCI)site at the University of Washington,with partial support from the National Science Foundation via awards NNCI-1542101,and NNCI-2025489.
文摘Silicon is a common material of choice for semiconductor optics in the infrared spectral range,due to its low cost,well-developed high-volume manufacturing methods,high refractive index,and transparency.It is,however,typically ill-suited for applications in the visible range,due to its large absorption coefficient,especially for green and blue light.Counterintuitively,we demonstrate how ultra-thin crystalline meta-optics enable full-color imaging in the visible range.For this purpose,we employ an inverse design approach,which maximizes the volume under the broadband modulation transfer function of the meta-optics.Beyond that,we demonstrate polarization-multiplexed functionality in the visible.This is particularly important as polarization optics require high index materials,a characteristic often difficult to obtain in the visible.
