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