Gold nanorod multilayer targets for coherent perfect absorption

A 3D periodic metamaterial composed of six layers of sub-wavelength 2D nanorod arrays was optimized numerically to achieve effective parameters enabling coherent perfect absorption (CPA). Using two different compositions, targets with CPA capabilities were designed around the central wavelength of 795 nm. By tuning the geometry and monitoring the effective parameters, impedance-matched targets and conjugate counterparts were designed providing complete and phase-dependent transmission.