Free space whispering gallery mode microlasers as highly sensitive biosensors Stefano Ferretti, Angela Capocefalo, Maria Grazia Ceraolo, Silvia Gentilini, Lorenzo Barolo, Paola Baiocco, Claudio Conti, Barbara Cortese, Claudia Bearzi, Roberto Rizzi and Neda Ghofraniha EPJ Web Conf., 309 (2024) 10002 Published online: 31 October 2024 DOI: 10.1051/epjconf/202430910002