Abstract: A device having a layered structure that includes a layer of phase change material and a matrix material layer having embedding quantum emitters is tuned. An electric field is applied through the matrix material layer and the layer of phase change material to change the emission wavelengths of the quantum emitters. A phase of the phase change material is changed, in a non-volatile manner, in each of one or more of local areas of the phase change material, to form local alterations that are opposite to respective ones of the quantum emitters in the matrix material layer, to locally modify the electric field at the respective quantum emitters.

Abstract: A device having a layered structure that includes a layer of phase change material and a matrix material layer having embedding quantum emitters is tuned. An electric field is applied through the matrix material layer and the layer of phase change material to change the emission wavelengths of the quantum emitters. A phase of the phase change material is changed, in a non-volatile manner, in each of one or more of local areas of the phase change material, to form local alterations that are opposite to respective ones of the quantum emitters in the matrix material layer, to locally modify the electric field at the respective quantum emitters.

Abstract: A device for securing a shoe lace has a first panel and a second panel affixed to the first panel. The second panel being movable about a fold line between a first position away from the first panel and a second position in contact with the first panel. A first shoe lace securing member extending from a first side of the first panel and a second shoe lace securing member extending from an opposed side of the first panel, each shoe lace securing member securing the first panel to a shoe. A fastener secures the first panel to the second panel when in contact with each other.