Structural color from a coupled nanowire pair beyond the bonding and antibonding model

Optical resonances in nanostructures can be harnessed to produce a wide range of structural colors. Conversely, the analysis colors has been used clarify nature optical resonances. Here, we show that silicon nanowire (NW) pairs display by controlling their radiative coupling. This is accomplished exciting series Fabry–Pérot-like modes where light repeatedly scattered between two NWs. These are beyond expectation from conventional chemical bonding model under quasi-electrostatic approximation, which only and antibonding formed pair system through modal hybridization. The additional eigenmodes found two-resonator originate nonlinear, frequency-dependent coupling strength derived low- Q resonators. Fabry–Pérot tuned across entire visible frequency varying distance NWs, leading what believe new type universal building blocks provide color within subwavelength footprint. presented results pave way toward design usage highly tunable exploit high-index nanostructures.