[9p-Z16-1~14] 4.1 Plasmonics and Nanophotonics

▲ [9p-Z16-14] Rotational Varifocal Moire Metalens based on Dielectric Silicon Pillar Meta-atom

〇Kentaro Iwami¹, Chikara Ogawa¹, Tomoyasu Nagase¹, Satoshi Ikezawa¹ (1.Tokyo U. Agri. Tech.)

Keywords:metamaterial, metasurface, metalens

In this paper, we experimentally demonstrate tunable focal length using Moire metalens at the near infrared frequency band using polarization-insensitive meta-atoms based on high-index contrast transmit arrays (HCTAs), which are made of amorphous silicon (a-Si) in this case. We designed a-Si octagonal pillars with polarization insensitivity and full 2π phase coverage at a wavelength of 900 nm. The fabricated metalens exhibited focal length tunability at the ranges from -∞ to -1.73 mm and from +1.73 mm to +∞ at a mutual rotation of ±90° at 900 nm