**About the Editors**

**Luigi Sirleto** is a research scientist, working at National Research Council of Italy. In september 2001, he spent 2 months at Institute of Nanotechnology, University of Twente, (NL). In July 2003, he spent 9 months, as a visiting scientist, at Electrical Engineering Department of UCLA (University of California, Los Angeles)-USA. In september 2006 he founded the Ultrafast and Nonlinear Optics Lab at Institute of Applied Sciences and Intelligent Systems (ISASI) of CNR and he has led the research activities of the same, until now. In April 2018, he received his qualification as Full Professor of Experimental Matter Physics. He is co-author of over 180 papers, mostly on nonlinear optics and photonics devices. He has served as a reviewer of many international journals and as a committee member of many national and international conferences.

**Giancarlo C. Righini** is a physicist; fellow of EOS, OSA, SIOF, and SPIE; and meritorious member of the Italian Physical Society (SIF). He worked for almost 40 years at CNR, the National Research Council of Italy, in Florence and Rome, acting as director of various structures. After his retirement from CNR, he was director of the Enrico Fermi Centre in Rome. He is author or co-author of over 500 papers, mostly on photonic glasses, integrated optics, and microresonators (ORCID ID: 0000-0002-6081-6971). He is editor of a book on glass micro- and nanospheres, and he is co-editor of other books. He was vice-president of IUPAP and of ICO, co-founder and president of the Italian Society of Optics and Photonics (SIOF), secretary of EOS, and member of the Board of Directors of SPIE. Currently, he is chair of the TC20 Committee on Glasses for Optoelectronics of ICG and honorary chair of the series of PRE (Photoluminescence in Rare Earths) Workshops.
