A state-changeable device (1) comprises: a first and a second particle (2, 3) arranged in proximity to each other; a coupling material (4) between the first and the second particle (2, 3); wherein the first and the second particle (2, 3) are adapted to provide a charge carrier distribution such that surface plasmon polaritons (SPP) occur; the coupling material (4) is adapted to exhibit a variable conductivity in response to a trigger signal (L) thereby changing an electro-optical coupling between the first and the second particle; the first and the second particle (2,3) are arranged in proximity to each other such that a first SPP configuration (P1) corresponds to a first electro-optical coupling between the first and the second particle (2, 3) and a second SPP configuration (P2) corresponds to a second electro-optical coupling between the first and the second particle (2, 3).