Terahertz detection with an antenna-coupled highly-doped silicon quantum dot.

Nanostructured dopant-based silicon (Si) transistors are promising candidates for high-performance photodetectors and quantum information devices. For highly doped Si with donor bands, the energy depth of donor levels and the energy required for tunneling processes between donor levels are typically on the order of millielectron volts, corresponding to terahertz (THz) photon energy. Owing to these properties, highly doped Si quantum dots (QDs) are highly attractive as THz photoconductive detectors.

[Left main coronary artery aneurysm detected by myocardial scintigraphy, coronary angiography and multislice computed tomography].

Aneurysm of the left main coronary artery is rare and is found in 0.1% of angiograms. A case of left main coronary aneurysm with no flow-limiting atherosclerotic coronary disease in a 53-year-old male is reported.