Deep-learning-assisted inverse design of dual-spin/frequency metasurface for quad-channel off-axis vortices multiplexing

Abstract

Recently, the metasurfaces for independently controlling the wavefront and amplitude of two orthogonal circularly polarized electromagnetic (EM) waves have been demonstrated to open a way toward spin-multiplexing compact metadevices. However, these metasurfaces are mostly restricted to a single operation frequency band. The main challenge to achieving multiple frequency manipulations stems from the complicated and time-consuming design caused by multifrequency cross talk. To solve this problem, we propose a deep-learning-assisted inverse design method for designing a dual-spin/frequency metasurface with flexible multiplexing of off-axis vortices. By analyzing the cross talk between different spin/frequency channels based on the deep-learning method, we established the internal mapping relationship between the physical parameters of a meta-atom and its phase responses in multichannels, realizing the rapid inverse design of the spin/frequency multiplexing EM device. As a proof of concept, we demonstrated in the microwave region a dual-frequency arbitrary spin-to-orbit angular momentum converter, a dual-frequency off-axis vector vortex multiplexer, and a large-capacity (16-channel) vortex beam generator. The proposed method may provide a compact and efficient platform for the multiplexing of vortices, which may further stimulate their applications in wireless communication and quantum information science.

Broadband Metasurface Absorber Based on an Optimal Combination of Copper Tiles and Chip Resistors

“…Moreover, it is confirmed that broadband performance is maintained from 6.79 to 11.33 GHz, with a fractional bandwidth of for oblique incidences up to the angle of with both the TE and TM polarizations. Although the absorbing bandwidth for the incident angle is confirmed as the widest one by comparing it with those of the other chip resistor based metasurface absorber [ 25 , 26 , 27 ], there is still room for improvement by adopting the design strategy utilizing the deep-learning algorithm [ 40 , 41 ] which may enable the optimization of not only the copper pattern, but also the locations of the chip resistors at once. The metasurface absorber composed of optimal copper tiles soldered with chip resistors has a great merit in that they can be easily fabricated with electronic circuits.…”

Deep image prior plus sparsity prior: toward single-shot full-Stokes spectropolarimetric imaging with a multiple-order retarder

“…These advantages are helpful for promoting the development of a miniature SPI system using free-space optical components 12 , 31 , 32 , 59 as well as chip-scale integration with silicon photonic circuits 64 or metasurfaces 65 – 72 …”

“…These advantages are helpful for promoting the development of a miniature SPI system using free-space optical components 12,31,32,59 as well as chip-scale integration with silicon photonic circuits 64 or metasurfaces. [65][66][67][68][69][70][71][72] Fig. 13 Acceleration strategy of the DIP-SP processing the images of all spectral bands one by one.…”

Guided‐Wave‐Excited Metasurface with Phase Modulation for Multichannel OAM Vortex Beams Generation and Switching

“…[28][29][30] In addition, some inspiring research focused on intelligent methods for designing metasurface vortex wave generators and other functional metasurfaces. [31][32][33] These advancements have the potential to drive the evolution of metasurfacebased systems toward greater intelligence and functionality.…”