Patent ID: 8250978

Claim:
A semiconductor bridge comprising: a bridge part disposed in contact with a substrate and having a narrowed section above the substrate, the bridge part heated by applying a current along a crosswise direction through a narrowed section of the bridge part and formed on the substrate and above the substrate, the narrowed section including a first layer and an ignition bridge layer, the first layer being formed on the substrate, having insulating properties, and containing SiO 2 , the ignition bridge layer being formed on the first layer and serving as a second layer above the first layer and above the substrate; wherein a width in a direction perpendicular to the crosswise direction of the bridge part at the first layer and a width in a direction perpendicular to the crosswise direction of the bridge part at the second layer are substantially equal to each other, wherein a side face and an upper face of the bridge part are exposed outwardly, wherein the first layer has a thermal conductivity of 50 W/m·K or less, an electrical resistivity of 10 6 Ω·m or more in room temperature, and a thickness between 0.2 and 2.0 μm, and wherein the substrate is made of silicon, a surface of the substrate is provided with an oxide film, and the first layer is an oxide film of SiO 2 .