High‐Efficiency Metasurface‐Based Surface‐Plasmon Lenses

Abstract

A device that can couple propagating light into surface plasmon polaritons (SPPs) focused into a small region is highly desired for on-chip photonics applications (e.g., energy-harvesting, sensing, etc.). However, current technologies suffer from large device footprint, low working efficiency, and insufficient light-manipulation freedom. Here, a generic approach for designing plasmonic lenses to generate predesigned vector SPP vortices with high efficiencies is established. Constructed with a set of meta-atoms exhibiting tailored reflection phases and polarization-conversion capabilities, the devices can convert normally incident circularly polarized light into predesigned vector SPP vortices with high efficiencies, due to both phase and polarization matching. As the illustrations, this study experimentally demonstrates directional SPP conversion (coupling efficiency: 35%; utilization efficiency: 98%) and SPP focusing effect at the wavelength of 1064 nm, with two meta-couplers in stripe and arc shapes, respectively. Finally, a ring-shaped meta-coupler is designed/fabricated, and the generation of a vector SPP vortex with significantly enhanced efficiency as compared to previous schemes is experimentally demonstrated. The results pave the way for realizing on-chip plasmonic devices to efficiently utilize SPPs with minimal footprints.

Supercavity Modes Excited by Bessel‐Type Plasmon Polaritons

“…Note that the convert efficiency of BPPs can be further increased by optimizing the plasmonic lens with metasurfaces. [ 41 ] Figure 4c,d shows the scattering spectrum of two example of the hybrid system, where the size of the cylinder is the same as that in Figure 4a,b, respectively. In both cases it's obviously observed that a narrow resonant peak overlaps with another broad peak, which corresponds to the high‐ and low‐Q mode, respectively.…”

Unveiling the luminescence property of Li2MgGeO4:Mn4+ featuring the tetrahedral crystallographic-site occupancy of Mn4+

“…Mn 4+ -activated oxide phosphors generally exhibit high chemical stability and strong red to deep red luminescence under ultraviolet (UV) light excitation, and they can be prepared using cheap starting materials via eco-friendly processes. Hence, these phosphors are very popular candidates for applications requiring red light and hence have been investigated for warm white-light emission and wide-gamut backlighting based on phosphor-converted white light-emitting diodes ( pc-WLEDs) [1][2][3][4][5][6] as well as for indoor plant cultivation 7,8 and thermometry. 3,9 As is well known, under a crystal field environment with an O h symmetry, the five d orbitals in a transition metal (TM) ion split into three-fold t 2g and two-fold e g levels.…”

The Effect of Height Error on Performance of Propagation Phase-Based Metalens

“…A metasurface, a kind of two-dimensional metamaterial, is composed of subwavelengthresolved meta-atoms that can be designed to enable multidimensional manipulation of the polarization, phase, and amplitude of the optical field [1][2][3][4][5][6]. By controlling the geometry, orientation, and composition of these meta-atoms, the metasurface can be used in a variety of applications, such as optical imaging, information processing, energy harvesting, and optical sensing [7][8][9][10][11][12][13][14][15][16].…”