Hiromi Okamoto (Institute for Molecular Science) found that highly circularly polarized (with a dissymmetry factor of ~0.7) visible luminescence is obtained, when chiral gold nanoparticles are irradiated with near-infrared femtosecond pulses.
This work has been published in Advanced Optical Materials, on May 31st.

https://onlinelibrary.wiley.com/doi/10.1002/adom.202400699