Twisted nano

Twisted laser light aimed at a nanoscale gold grating offers a novel way to probe molecular structure, according to a team from the University of Bath, the University of Cambridge, and University College London, UK. The team uses circular dichroism with a higher-order diffraction beam to interact with chiral quasiplanar structures. The chosen sample geometry demonstrates spectrally tunable polarization conversion and extremely large circular dichroism, the team reports.