Conventional versus holographic PINEM imaging. (A) In conventional PINEM, propagating SPPs are imaged with long electron pulses, rendering only its time-averaged envelope with a spatial resolution Δx ~ τelvg. (B) In local holographic PINEM, two SPPs propagate with orthogonal wave vectors k1 and k2 forming a standing wave pattern along […]

This device uses a frequency comb laser to emit and modulate microwaves wirelessly. The laser uses different frequencies of light beating together to generate microwave radiation. The researchers used this phenomenon to send a song wirelessly to a receiver. Credit: Marco Piccardo/Harvard SEAS You’ve never heard Dean Martin like this. […]

Credit: Zhanni Wu. Researchers at the University of Michigan and City University of New York have recently proposed and experimentally validated a transparent, electronically tunable metasurface. This metasurface, presented in a paper published in Physical Review X, can rotate the polarization of an arbitrarily polarized incident wave without changing its axial ratio. […]

Drawing of a pulse propogating in the chip. Credit: EPic Lab, University of Sussex Scientists in the Emergent Photonics Lab (EPic Lab) at the University of Sussex have made a breakthrough to a crucial element of an atomic clock—devices which could reduce our reliance on satellite mapping in the future—using […]

Principle and experimental set-up. a, Schematic representation of energy exchange between an unbiased photodiode and a planar surface located in the far-field of the photodiode. b, Schematic description of photonic refrigeration in the near-field. Simultaneous enhancement of photon transport from tunnelling of evanescent waves and suppression of luminescence from a […]

Electrons traveling between two layers of atomically thin material give off tiny bursts of electromagnetic waves in the terahertz spectral range. This glow, shown in red and blue, allowed researchers at SLAC and Stanford to observe and track the electrons’ ultrafast movements. Credit: Greg Stewart/SLAC National Accelerator Laboratory Electrons flowing […]

Credit: ORNL Researchers have developed a compact laser that emits light with extreme spectral purity that doesn’t change in response to environmental conditions. The new potentially portable laser could benefit a host of scientific applications, improve clocks for global positioning (GPS) systems, advance the detection of gravitational waves in space […]