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The submillimetre or terahertz region of the electromagnetic spectrum contains approximately half of the total luminosity of the Universe and 98% of all the photons emitted since the Big Bang. This radiation is strongly absorbed in the Earth's atmosphere, so space-based terahertz telescopes are crucial for exploring the evolution of the Universe. Thermal(More)
Self-assembled monolayers (SAMs) are widely used in a variety of emerging applications for surface modification of metals and oxides. Here, we demonstrate a new type of molecular self-assembly: the growth of organosilane SAMs at the surface of organic semiconductors. Remarkably, SAM growth results in a pronounced increase of the surface conductivity of(More)
Related Articles Mid-infrared photothermal heterodyne spectroscopy in a liquid crystal using a quantum cascade laser Appl. Phys. Lett. 101, 044101 (2012) Reduction of persistent photoconductivity in ZnO thin film transistor-based UV photodetector Appl. Phys. Lett. 101, 031118 (2012) Subpicosecond electron-hole recombination time and terahertz-bandwidth(More)
We study the decay of D+ and D+ s mesons into charged five-body final states, and report the discovery of the decay mode D+ → K+K−π+π+π−, as well as measurements of the branching ratios of the decay modes D+ → K−π+π+π+π−, D+ s → K+K−π+π+π−, D+ s → φπ +π+π− and D+/D+ s → π +π+π+π−π−. An analysis of the resonant substructure for D+ → K−π+π+π+π− and D+ s → K(More)
We present a technology based on Nb/NbxSi1−x/Nb junctions, with barriers near the metal-insulator transition, for applications in superconducting electronics (SCE) as an alternative to Nb/AlOx/Nb tunnel junctions. Josephson junctions with co-sputtered amorphous Nb-Si barriers can be made with a wide variety of electrical properties: critical current density(More)
We present an overview of the recent progress made in the development of a far-IR array of ultrasensitive hot-electron nanobolometers (nano-HEB) made from thin titanium (Ti) films. We studied electrical noise, signal and noise bandwidth, single-photon detection, optical noise equivalent power (NEP), and a microwave SQUID (MSQUID) based frequency domain(More)
We describe a technique for characterizing bolometric detectors that have sufficient sensitivity to count single terahertz photons. The device is isolated from infrared blackbody radiation and a single terahertz photon is simulated by a fast microwave pulse, where the absorbed energy of the pulse is equal to the photon energy. We have employed this(More)
Using a large sample of charm semileptonic decays collected by the FOCUS photoproduction experiment at Fermilab, we present evidence for a small, even spin K−π+ amplitude that interferes with the dominant K ∗0 component in the D+ → K−π+μ+ν final state. Although this interference significantly distorts the D+ → K−π+μ+ν decay angular distributions, the new(More)