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Directional control of the diffusion of excitons is desired for excitonic devices, but being neutrally charged they can’t be transported by applying a bias voltage as for conventional electronic transport. It is now shown that surface acoustic waves can direct the flux of excitons over micrometre distances, even at room temperature.
This Review details the fundamental photonics and thermodynamics concepts that underlie the processes of radiative cooling, and discusses a few emerging directions associated with radiative cooling research.
Nanoscale helix-shaped structures of CdTe are shown to exhibit strong nonlinear chiral effects that could prove useful for high-throughput chemical analysis.
Researchers reveal an effect in random media, called coherent back-emission, in which directional memory of the incoming light field persists after incident radiation ceases to be present.
An off-the-shelf silicon image sensor can directly record few-cycle optical waveforms in the mid-infrared in a single shot by employing tunnelling ionization as a temporal gate.
