A field concentrating surface enhanced Raman spectroscopy platform includes a signal amplifying material and a pattern of apertures extending through the signal amplifying material. In one aspect, an illumination device with a light guide can include both faceted and holographic light turning features. Crystal growth proceeds from a surface toward an inside of the first oxide component by a first heat treatment, so that a first oxide crystal component is formed in contact with at least part of the base component. A current providing circuit has a second monitor transistor for flowing a fourth off-leak current that is smaller than the second off-leak current, and a providing circuit for providing the second off-leak current from the high power potential responsive to the fourth off-leak current. A removable base engages with the bottom end of the bird feed container.