Measurements of IgG Protein at Ultralow and Ultrawide Concentration Ranges Exploiting Spoon-Shaped Waveguides. - Debora Verolla; Francesco Arcadio; Luigi Zeni; Chiara Marzano; Mimimorena Seggio; Ernesto Nappi; Nunzio Cennamo (IEEE Trans. Instrum. Meas., 2025)