With nanosecond radiative lifetimes, quenching dominates over enhancement for conventional fluorescence emitters near metal interfaces. We explore the fundamentally distinct behavior of photoluminescence (PL) with few-femtosecond radiative lifetimes of a coupled plasmonic emitter. Controlling the emitter-surface distance with subnanometer precision by combining atomic force and scanning tunneli...

We report the design, fabrication, and experimental characterization of an externally-fed, silicon batchfabricated MEMS electrospinning planar array with as many as 9 steady-operating emitters in 1 cm – more than a 7-fold increase in emitter density compared to state-of-the-art MEMS multiplexed electrospinning sources. The device simultaneously generates multiple nanofiber jets at 20 kV or less...

Efficient interaction of light and matter at the ultimate limit of single photons and single emitters is of great interest from a fundamental point of view and for emerging applications in quantum engineering. However, the difficulty of generating single-photon streams with specific wavelengths, bandwidths, and power as well as the weak interaction probability of a single photon with an optical...

The effects of Shockley–Read–Hall, Auger, radiative, and intrinsic surface base recombination processes in the emitter-base space-charge region on the current gain of Pnp AlGaAs/GaAs heterojunction bipolar transistors are analyzed. At low forward emitter-base bias, the current gain of a typical Pnp AlGaAs/GaAs heterojunction bipolar transistor is shown to be reduced substantially below its valu...

Full-dimensional computational fluid dynamics (CFD) simulations are presented for nano electrospray ionization (ESI) with various emitter designs. Our CFD electrohydrodynamic simulations are based on the Taylor-Melcher leaky-dielectric model, and the volume of fluid technique for tracking the fast-changing liquid-gas interface. The numerical method is first validated for a conventional 20 μm in...

Signal parameter estimation from sensor array data is a problem that is encountered in many engineering applications. Under the assumption of Gaussian distributed emitter signals, the so-called stochastic maximum likelihood (ML) technique is known to be statistically efficient, i.e., the estimation error covariance attains the Cramer-Rao bound (CRB) asymptotically. Herein, it is shown that also...

The Purcell effect is defined as a modification of the spontaneous emission rate of a quantum emitter at the presence of a resonant cavity. However, a change of the emission rate of an emitter caused by an environment has a classical counterpart. Any small antenna tuned to a resonance can be described as an oscillator with radiative losses, and the effect of the environment on its radiation can...

The California State Bureau of Automotive Repair uses a high-emitter profile model to direct, or screen a fraction of the vehicle fleet in for inspection and maintenance testing at test-only facilities. Reviews by the California Inspection/Maintenance Review Committee showed the high-emitter profile to be inefficient and in need of improvement. In this study, using in-use vehicle emissions data...

This paper presents passive radar emitter localization using the Time-Difference-Of-Arrival (TDOA) technique from Unmanned Aerial Vehicles (UAVs) working in conjunction with a fixed/mobile station (such as a shipborne/land-based station) to geolocate a radar emitter to fulfill maritime and littoral area surveillance. Instead of using multiple stationary sensors, multiple TDOA measurements are o...

Locating emitters by cross-correlating received signals to compute their time-difference-of-arrival (TDOA) and the frequency-difference-of-arrival (FDOA) requires that signal data received at one platform be transferred to the other platform. Often the data link used has insufficient bandwidth to accomplish the transfer within the time requirement, and therefore use of data compression is neede...