[9a-A23-1~10] CS.2 Code-sharing session of 3.2&4.4

9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[9a-A23-3] Proposal of an Asymmetric Binary Grating for AR Glasses Enabled by Obliquely Deposited TiO₂

〇(M1)NOA SAITO¹, TOWA MAEKAWA¹, HIROAKI EGAWA¹, TAKUMI OIE¹, YUKI NAKAYAMA¹, TOMA UNNO¹, RAKU YAMAJI¹, TOMOHIRO AMEMIYA¹ (1.Science Tokyo)

Keywords:

AR Glasses

To improve the optical coupling efficiency of waveguide-type AR glasses, an asymmetric structure created by oblique deposition of TiO₂ onto binary diffraction gratings is proposed. Using Rigorous Coupled-Wave Analysis (RCWA), the dominant diffraction ratio and diffraction asymmetry were evaluated with respect to grating height and fill factor. The analysis identified a parameter range where the addition of the TiO₂ layer enables both high coupling efficiency and strong directional (unidirectional) diffraction characteristics. This approach is expected to facilitate the realization of high-efficiency input couplers without requiring complex fabrication processes.