H. Okabe

Three-dimensional optical metamaterial with a negative refractive index

Tailoring Dispersion for Broadband Low-loss Optical Metamaterials Using Deep-subwavelength Inclusions

Flat optics with designer metasurfaces

Composite right/left-handed transmission line metamaterials

A Compact Enhanced-Bandwidth Hybrid Ring Using an Artificial Lumped-Element Left-Handed Transmission-Line Section