[10a-E201-1~11] 3.11 Nanoscale optical science and near-field optics

11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)

[10a-E201-8] Fabrication and Optical Characterization of a Polarization-Selective Wide-Angle
Absorber Based on an Anisotropic-Period Aluminum Nanohole Array Structure

〇(M1)Tomoki Amemiya¹, Takeshi Kato^2,3, Kazumasa Hiramatsu¹, Atsushi Motogaito¹ (1.Grad. Sch. Eng., Mie Univ., 2.IMaSS, Nagoya Univ., 3.Grad. Sch. Eng., Nagoya Univ.)

Keywords:

Al nanohole array,Fano resonance,Wide-angle light absorption

In this study, we designed, fabricated, and optically characterized a polarization-selective wide-angle absorber based on an anisotropic-period Al nanohole array structure. Conventional square-period structures achieved perfect absorption through Fano resonance, but their optical response strongly depended on the incident angle. To address this issue, an anisotropic-period structure was introduced to control the dispersion relation of surface plasmon polaritons (SPPs) and achieve wide-angle absorption. RCWA simulations suggested wide-angle absorption over incident angles from 0° to 30° at a wavelength of 405 nm. Reflectance measurements of the fabricated Al nanohole array with periods of 230 nm × 365 nm showed good agreement with the simulation results, confirming that the observed absorption peak originated from Fano resonance.