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Near Field Microscopy

All articles tagged with #near field microscopy

science21 days ago•19 min saved

Direct THz Plasmon Imaging Reveals 2D Superconducting Superfluid

Researchers used near-field terahertz spectroscopy with a spintronic THz emitter to image a below-gap, two-dimensional superfluid plasmon in few-layer Bi2Sr2CaCu2O8+x. The resonance, observed only in the superconducting phase and absent in bulk samples, was mapped for its dispersion and geometric anisotropy, providing a direct, spatially resolved view of momentum- and frequency-dependent 2D superconductivity and the superfluid stiffness within the CuO2 planes.

via Nature|

#near-field-microscopy #plasmon #science

science25 days ago•10 min saved

CW laser and sharp tip push optical imaging to 0.1 nm, revealing atoms

A team uses a continuous-wave mid-infrared laser and a needle-sharp metal tip to squeeze light into sub-atomic gaps, producing near-field optical tunneling emission that resolves atomic-scale features down to about 0.1 nanometers—roughly 100,000 times smaller than conventional diffraction-limited optics. The method works with standard lasers and could enable widespread atomic-scale optical imaging in catalysts, semiconductors, and quantum materials, with findings published in Nano Letters.

via Interesting Engineering|

#atomic-scale-imaging #near-field-microscopy #optics