Abstract: A substrate is composed of a first material. A photonic structure is composed of the first material connected to one or more support structures composed of the first material between the photonic structure and a surface of the substrate, with at least one of the support structures supporting a first section of a strip of the photonic structure. The first section has a width that is wider than a width of a second section of the strip and has a length that is at least about twice the width of the second section of the strip.

Abstract: An etch mask is formed on a substrate. The substrate is positioned in an enclosure configured to shield an interior of the enclosure from electromagnetic fields exterior to the enclosure; and the substrate is etched in the enclosure, including removing a portion of the substrate to form a structure having at least a portion that is isolated and/or suspended over the substrate.

Abstract: A substrate is composed of a first material. A photonic structure is composed of the first material connected to one or more support structures composed of the first material between the photonic structure and a surface of the substrate, with at least one of the support structures supporting a first section of a strip of the photonic structure. The first section has a width that is wider than a width of a second section of the strip and has a length that is at least about twice the width of the second section of the strip.

Abstract: An etch mask is formed on a substrate. The substrate is positioned in an enclosure configured to shield an interior of the enclosure from electromagnetic fields exterior to the enclosure; and the substrate is etched in the enclosure, including removing a portion of the substrate to form a structure having at least a portion that is isolated and/or suspended over the substrate.

Abstract: A control circuit including at least one switch and a plurality of rectifiers for selectively applying a-c utility power to either or both of two remote electrically-powered apparatus at respective first and second states of rectification by means of a conventional two-wire interconnection cable. Where one of the apparatus is of a type, such as a motor, adapted to be powered by a full-wave a-c, the control circuit includes a relay and relay switch responsive to switch-selectable half-wave a-c for connecting the motor to receive full-wave power. In one disclosed embodiment, the two apparatus comprise a composite smoke detector and lamp fixture, and the control circuit provides continuous power at a first state of rectification to the smoke detector portion of the fixture and switch-selectable power at a second state of rectification to the fixture lamp.