Tip-enhanced Raman spectroscopy （TERS） is high-sensitivity and high spatial-resolution optical analytical technique with nanoscale resolution beyond the diffraction limit. It is also one of the most recent advances ...Tip-enhanced Raman spectroscopy （TERS） is high-sensitivity and high spatial-resolution optical analytical technique with nanoscale resolution beyond the diffraction limit. It is also one of the most recent advances in nanoscale chemical analysis. This review provides an overview of the state-of-art inTERS, in-depth information about the different available types of instruments including their （dis）advantages and capabilities. Finally, an overview about recent development in High-Vacuum TERS is given and some challenges are raised.展开更多
When exposed to intense electromagnetic fields, the quantum vacuum is expected to exhibit properties of a polarizable medium akin to a weakly nonlinear dielectric material. Various schemes have been proposed to measur...When exposed to intense electromagnetic fields, the quantum vacuum is expected to exhibit properties of a polarizable medium akin to a weakly nonlinear dielectric material. Various schemes have been proposed to measure such vacuum polarization effects using a combination of high- power lasers. Motivated by several planned experiments, we provide an overview of experimental signatures that have been suggested to confirm this prediction of quantum electrodynamics of real photon–photon scattering.展开更多
Quantum or torsion gravity models predict unusual properties of space-time at very short distances. In particular, near the Planck length, around 10<sup>-35</sup> m, empty space may behave as a crystal, si...Quantum or torsion gravity models predict unusual properties of space-time at very short distances. In particular, near the Planck length, around 10<sup>-35</sup> m, empty space may behave as a crystal, singly or doubly refractive. This hypothesis, however, remains uncheckable for any direct measurement since the smallest distance accessible in experiment is about 10<sup>-19</sup> m at the LHC. Here we propose a laboratory test to measure space birefringence or refractivity induced by gravity. A sensitivity 10<sup>-31</sup> m for doubly and 10<sup>-28</sup> m for singly refractive vacuum could be reached with PETRA 6 GeV beam exploring UV laser Compton scattering.展开更多
文摘Tip-enhanced Raman spectroscopy （TERS） is high-sensitivity and high spatial-resolution optical analytical technique with nanoscale resolution beyond the diffraction limit. It is also one of the most recent advances in nanoscale chemical analysis. This review provides an overview of the state-of-art inTERS, in-depth information about the different available types of instruments including their （dis）advantages and capabilities. Finally, an overview about recent development in High-Vacuum TERS is given and some challenges are raised.
文摘When exposed to intense electromagnetic fields, the quantum vacuum is expected to exhibit properties of a polarizable medium akin to a weakly nonlinear dielectric material. Various schemes have been proposed to measure such vacuum polarization effects using a combination of high- power lasers. Motivated by several planned experiments, we provide an overview of experimental signatures that have been suggested to confirm this prediction of quantum electrodynamics of real photon–photon scattering.
文摘Quantum or torsion gravity models predict unusual properties of space-time at very short distances. In particular, near the Planck length, around 10<sup>-35</sup> m, empty space may behave as a crystal, singly or doubly refractive. This hypothesis, however, remains uncheckable for any direct measurement since the smallest distance accessible in experiment is about 10<sup>-19</sup> m at the LHC. Here we propose a laboratory test to measure space birefringence or refractivity induced by gravity. A sensitivity 10<sup>-31</sup> m for doubly and 10<sup>-28</sup> m for singly refractive vacuum could be reached with PETRA 6 GeV beam exploring UV laser Compton scattering.
