We demonstrate far-field optical imaging at the nanoscale with unlabeled samples. Subdiffraction resolution images of autofluorescent samples are obtained by depleting the ground state of natural fluorophores by transferring them to a metastable dark state and simultaneously localizing those fluorophores that are transiently returning. Our approach is based on the insight that nanoscopy methods...

We have repeated our earlier observations of the Infrared and submllllmeter background radiation. While the measured values of the infrared background radiation remain unchanged, we have failed to observe the high flux previously reported for the 0.4 to 1.3 mm range. This indicates that the flux cannot have been galactic or cosmic, but further observations are needed to rule out a solar cycle d...

There are numerous applications where we need to ensure that multiple moving objects are sufficiently far apart. Furthermore, in many moving object domains, there is positional indeterminacy — we are not 100% sure exactly when a given moving object will be at a given location. [Yaman et al., 2004] provided a logic of motion but did not provide algorithms to ensure that moving objects are kept s...