Structure-terahertz property relationship in tellurite glasses

Structure-terahertz (THz) property relationship for sodium tungsten tellurite (NWT) and lanthanum tungsten tellurite (LWT) glass systems is reported and is the first of its kind for non-silicate oxide glasses. Raman spectroscopy was used to determine structural units, connectivity, and glass network. Terahertz time-domain spectroscopy (THz-TDS) was used to record the THz refractive index, n(THz), at 0.502 THz. NWT and LWT glasses record higher measurable n(THz) correlated to a glass network with substantial TeO${}_2$ and WO${}_3$ content with mixed Te-O-W linkages and TeO${}_2$- or WO${}_3$-rich content with homonuclear Te-O-Te or W-O-W linkages, respectively. Concurrent examination revealed three distinct regions of n(THz).