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| VOLUME 121 (2025) | ISSUE 7 | PAGE 535 |
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Additive analysis of transmission-type all-dielectric encoding supergrating
M. F. Zheng+, Y. Tao*, B. Lou×, F. H. Liu*, Y. L. Li°, Y. Tian∇
+Geely Automotive Institute, Hangzhou Vocational & Technical College, 310018 Hangzhou, China *Special Equipment Institute, Hangzhou Vocational & Technical College, 310018 Hangzhou, China ×Jiaxing Nanyang Polytechnic Institute, 314031 Jiaxing, China °Jiaxing Nanhu University, 314001 Jiaxing, People's Republic of China ∇Institute of Optoelectronic Technology, China Jiliang University, 310018 Hangzhou, China
Abstract
A transmission-type all-dielectric coded supergrating operating in the terahertz band is designed. The structure uses Si as the dielectric material to realize the change of transmission phase 2π in the band of  THz. Compared with the conventional gratings, the
transmission-type all-dielectric coded supergratings have the advantages of wide operating
bandwidth, high transmittance, easy coupling with fiber, and low cost. It represents a new
direction of optical coding technology and has a high application prospect and research value. We
design a 1-bit all-dielectric coded supergrating. By changing the width of the grating element
structure, two grating basic element structures with high transmission coefficients and continuous
transmission phase changes of 180° are obtained.
Based on the addition theorem of digital coding,
the far-field scattering angle of the grating is controlled by encoding the basic unit structure of the
grating, changing its arrangement order and physical superposition. Based on the generalized Snell
theorem and the far-field scattering principle, the far-field scattering angle of the designed
supergrating structure is calculated theoretically, and the characteristics of the simulation results
are analyzed.
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