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Spin Angular Momentum Controlled Multifunctional Alla??Dielectric Metasurface Doublet
摘要： Lenses are the most important components of portable and integrable optical systems. Due to the inherent limitation of system sizes, external accessories are required for realizing additional functions such as close-up or telegraph imaging, making the entire system complicated and cumbersome. Herein, based on the developments of metalenses, a spin angular momentum controlled multifunctional camera system is reported. Two types of metalens with high efficiencies are designed and fabricated for circularly polarized and nonpolarized light, respectively. By combining them into a doublet, multiple functions are realized beyond a camera lens. For left-handed circular polarization light, the doublet works as a compound microscope with a magnification factor of 20 and a resolution of 1.07 μm. The system switches to a Galileo telescope when the incident light turns to be right-handed circularly polarized. This research shall extend and strengthen the practical applications of metasurfaces in portable imaging systems as well as the integrated sensing terminals.
关键词： lens doublet,Galileo telescope,magnification,metalens,camera lens
更新于2025-09-23 15:21:01
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Multilayer Non-interacting Dielectric Metasurfaces For Multiwavelength Metaoptics
摘要： Metasurfaces provide a versatile platform for manipulating the wavefront of light using planar nanostructured surfaces. Transmissive metasurfaces, with full 2π phase control, are a particularly attractive platform for replacing conventional optical elements due to their small footprint and broad functionality. However, the operational bandwidth of metasurfaces has been a critical limitation and is directly connected to either their resonant response or the diffractive dispersion of their lattice. While multiwavelength and continuous band operation have been demonstrated, the elements suffer from either low efficiency, reduced imaging quality, or limited element size. Here, we propose a platform that provides for multiwavelength operation by employing tightly spaced multilayer dielectric metasurfaces. As a proof of concept, we demonstrate a multiwavelength metalens doublet (NA=0.42) with focusing efficiencies of 38% and 52% at wavelengths of 1180 nm and 1680 nm, respectively. We further show how this approach can be extended to three wavelength metalenses as well as a spectral splitter. This approach could find applications in fluorescent microscopy, digital imaging, and color routing.
关键词： Multiwavelength metalens,spectrum splitter,metasurface doublet,polarization-insensitive
更新于2025-09-23 15:21:01
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Generalized Hartmann-Shack array of dielectric metalens sub-arrays for polarimetric beam profiling
摘要： To define and characterize optical systems, obtaining the amplitude, phase, and polarization profile of optical beams is of utmost importance. Traditional polarimetry is well established to characterize the polarization state. Recently, metasurfaces have successfully been introduced as compact optical components. Here, we take the metasurface concept to the system level by realizing arrays of metalenses, allowing the determination of the polarization profile of an optical beam. We use silicon-based metalenses with a numerical aperture of 0.32 and a mean measured focusing efficiency in transmission mode of 28% at a wavelength of 1550 nm. Our system is extremely compact and allows for real-time beam diagnostics by inspecting the foci amplitudes. By further analyzing the foci displacements in the spirit of a Hartmann-Shack wavefront sensor, we can simultaneously detect phase-gradient profiles. As application examples, we diagnose the profiles of a radially polarized beam, an azimuthally polarized beam, and of a vortex beam.
关键词： metasurfaces,metalens,beam profiling,polarimetry,Hartmann-Shack array
更新于2025-09-23 15:21:01
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Polarization-enabled tunable focusing by visible-light metalenses with geometric and propagation phase
摘要： Flat metalenses with tunable focal length have wide applications in modern optical systems with high integration requirement. Here, by combining propagation phase and geometric phase, we numerically realize a metalens with a tunable focal length by controlling the polarization state of incident light. The tuning range can be as large as 15λ at the designer wavelength. Furthermore, the tunable performance can operate at the entire visible band with an ef?ciency over 35%. We believe that the proposed polarization-enabled tunable focusing metalens will ?nd signi?cant applications in imaging and sensing applications.
关键词： tunable focusing,metalens,polarization state,geometric phase
更新于2025-09-23 15:19:57
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Polarization Controlled Dual Functional Reflective Planar Metalens in Near Infrared Regime
摘要： The metalens has been a hotspot in scienti?c communications in recent years. The polarization-controlled functional metalens is appealing in metalens investigation. We propose a metalens with dual functions that are controlled by polarization states. In the ?rst design, when applied with x- and y-polarized light, two focal spots with di?erent focal lengths are acquired, respectively. The proposed metalens performs well when illuminated with adjacent wavelengths. In the second design, the re?ected light is focused when applied with x-polarized light, and when applied with y-polarized light, the re?ected light is split into two oblique paths. We believe that the results will provide a new method in light manipulation.
关键词： splitting,focusing,dual functional-metalens,polarization controlling
更新于2025-09-23 15:19:57
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Terahertz Metalens for Multifocusing Bidirectional Arrangement in Different Dimensions
摘要： Metasurface lenses are typically investigated for a lot of characteristics, but the design method for conventional devices is comparatively simple in terms of controlling the quantity, position, and size of focal spots. Herein, ultra-thin-phase metasurface structures based on complementary square-split-ring (SSR) nanoantennas have been proposed to achieve terahertz (THz) optical metalenses with multidimensionality and multifocusing. The principle of beam propagation and efficient transmission can be effectively explained through the Fabry–Pérot resonance mode. The THz metalens can efficiently transfer linear cross-polarization under the effects of gratings in the incident plane. By locally tailoring edge lengths and opening the angles of the split rings, full control over abrupt phase changes can be achieved. Two symmetrically distributed parallel focal spots and two vertical focal spots with arbitrary distance can be obtained by arranging the SSR units on the metalenses. Furthermore, we apply the concept of a partitioned-phase mode to realize a double-focusing metalens in the longitudinal direction, which provides a flexible and convenient method to achieve the desired focusing properties. The simulation results are expected to pave the way for practical use of metasurfaces in optical holography, optical-information coding, and parallel-particle trapping.
关键词： nanoantenna,phase shift,Multifocusing metalens,Fabry-Pérot-like resonance,terahertz
更新于2025-09-19 17:15:36
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Multichannel Spatially Nonhomogeneous Focused Vector Vortex Beams for Quantum Experiments
摘要： The utilization of vector vortex beams (VVBs) in quantum experiments has recently become a topic of tremendous interest. However, achieving a focused, high-resolution, transmission-type, multichannel, and nonhomogeneously polarized VVB array remains a great challenge. Here, by introducing a degree of freedom on a high-order Poincaré sphere in the form of latitude-polarization control and locally tailoring the phase and transverse polarization distributions at the subwavelength scale, a single transmission-type dielectric metalens design for producing a multichannel, spatially nonhomogeneous, focused VVB array is demonstrated. Three special kinds of lattices (triangle, square, and rhombus) are demonstrated, yielding independently controllable orbital angular momentum states and polarization states of a tightly focused field in each channel. Furthermore, by using only the proposed metalens and a polarizer, a mode-demultiplexing system is realized with a mode crosstalk as low as ?34.8 dB for all four channels. The results offer a robust technological foundation for exploiting spatial degrees of freedom of structured light in the miniaturization and integration of quantum photonics devices.
关键词： mode crosstalk,metalens,mode-demultiplexing system,vector vortex beams,latitude polarization
更新于2025-09-19 17:15:36
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[IEEE 2019 IEEE International Symposium on Phased Array System & Technology (PAST) - Waltham, MA, USA (2019.10.15-2019.10.18)] 2019 IEEE International Symposium on Phased Array System & Technology (PAST) - Demonstration of Metamaterial-Enabled Overlapped Subarray for a Linear Array
摘要： Known overlapped subarray antennas combine array elements in a complex corporate or space-fed beamforming network, resulting in reduced scan loss and grating lobes. In this paper we demonstrate an overlapped subarray antenna enabled simply by a low index metamaterial lens (metalens) over a 5 horn line array. The metalens was designed to spread the field from the horn element with an aperture field distribution that generates an element pattern with flat top and low sidelobes. The paper presents the analytical technique used in the lens design, shows predicted and measured patterns, and discusses challenges and opportunities for achieving wide bandwidth and full scan from a 2-dimensional aperture array with a metalens.
关键词： horn array,overlapped subarray,metamaterials,low index,metalens
更新于2025-09-19 17:13:59
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Chiral Second-Harmonic Generation from Monolayer WS <sub/>2</sub> /Aluminum Plasmonic Vortex Metalens
摘要： Two-dimensional spiral plasmonic structures have emerged as a versatile approach to generate near-field vortex fields with tunable topological charges. We demonstrate here a far-field approach to observe the chiral second-harmonic generation (SHG) at designated visible wavelengths from a single plasmonic vortex metalens. This metalens comprises an Archimedean spiral slit fabricated on atomically flat aluminum epitaxial film, which allows for precise tuning of plasmonic resonances and subsequent transfer of two-dimensional materials on top of the spiral slit. The nonlinear optical measurements show a giant SHG circular dichroism. Furthermore, we have achieved an enhanced chiral SHG conversion efficiency (about an order of magnitude greater than the bare aluminum lens) from monolayer tungsten disulfide (WS2)/aluminum metalens, which is designed at the C-exciton resonance of WS2. Since the C-exciton is not a valley exciton, the enhanced chiral SHG in this hybrid system originates from the plasmonic vortex field-enhanced SHG under the optical spin-orbit interaction.
关键词： optical spin-orbit interaction,Surface plasmonic vortex metalens,aluminum epitaxial film,chiral nonlinearity,second-harmonic generation,monolayer tungsten disulfide
更新于2025-09-19 17:13:59
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High-Efficiency and Broadband Near-Infrared Bi-Functional Metasurface Based on Rotary Different-Size Silicon Nanobricks
摘要： Several novel spin-dependent bi-functional metasurfaces consisting of different-sized rotary silicon nanobricks have been proposed and numerically investigated based on the Pancharatnam–Berry phase and structural phase simultaneously. Here, a transmission mechanism is strictly deduced, which can avoid crosstalk from the multiplexed bi-functional metasurface. Four kinds of high-efficiency including a spin-dependent bi-functional beam deflector, a spin-dependent bi-functional metalens, a bi-functional metasurface with spin-dependent focusing and deflection function, and a spin-dependent bi-functional vortex phase plate. All of the results demonstrate the superior performances of our designed devices. Our work opens up new doors toward building novel spin-dependent bi-functional metasurfaces, and promotes the development of bi-functional devices and spin-controlled photonics.
关键词： metalens,metasurface,phase modulation,vortex beam
更新于2025-09-16 10:30:52