EMDataBank.org: unified data resource for CryoEM

Cryo-electron microscopy reconstruction methods are uniquely able to reveal structures of many important macromolecules and macromolecular complexes. EMDataBank.org, a joint effort of the Protein Data Bank in Europe (PDBe), the Research Collaboratory for Structural Bioinformatics (RCSB) and the National Center for Macromolecular Imaging (NCMI), is a global ‘one-stop shop’ resource for deposition and retrieval of cryoEM maps, models and associated metadata. The resource unifies public access to the two major archives containing EM-based structural data: EM Data Bank (EMDB) and Protein Data Bank (PDB), and facilitates use of EM structural data of macromolecules and macromolecular complexes by the wider scientific community

Spatio-spectral measurement of a surface plasmon polariton in a gold nano-slit array

A spatio-spectral measurement of transmitted near field distribution from a nano optic structure is demonstrated by near field scanning optical miscroscopy (NSOM) with the point spectroscopic approach. This method provides spectral information of nano-optic system with sub-diffraction limit spatial resolution. The gold nano slit array is a good model system where analytical calculation is possible by the modal expansion method for all diffraction orders with surface impedance boundary conditions. The point spectroscopic analysis of near field distribution shows a good agreement with theoretical model calculation

Optical Characterization of Nanomaterials

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Low-temperature Near-field Scanning Optical Microscope for UV-visible Spectroscopy of Nanostructures

A low-temperature near-field scanning optical microscope (LT-NSOM) is designed and realized in order to study the optical properties of nanostructures at cryogenic temperatures in the UV-visible wavelength range. Due to the simple and extensive optical design, any type of NSOM operation mode is accessible. In particular, the localized photoluminescence spectra of nanostructures can be measured at temperatures from 13 K up to 300 K. We successfully demonstrate the performance of our LT-NSOM by investigating InGaN/GaN multiple quantum wells grown on a sapphire substrate at 15 K