Abstract
Dielectric properties of oxyfluorosilicate (OFS) glasses have been characterized using Terahertz (THz)-time domain spectroscopy in the sub-THz region as well as optical reflection measurement. OFS glass containing 20 mol% of Nb2O5, which is termed ZNbKLSNd glass, has the highest refractive index of 3.70 in the sub-THz region. The THz and optical refractive indices of various silicate oxide glasses, including OFS glasses, have been confirmed to be correlated by a unified relationship utilizing a parameter defined by the ratio of ionic to electronic polarizability. Additionally, the frequency dependence of the THz dielectric constant has been interpreted by a single oscillator model for all silicate oxide glasses including OFS glasses. On the basis of the present unified dielectric model, the very high refractive index of ZNbKLSNd glass has been attributed to the lowering of oscillator resonance wavelength originated from the incorporation of Nb2O5intermediate network former.
Highlights
Terahertz (THz) wave technology, which typically covers a frequency range of sub-THz to tens-THz, is demanded for the applications to a variety of systems including spectroscopy, communications, sensing and imaging due to the characteristic transmission and propagation properties of THz waves in various media [1,2,3]
The THz dielectric properties of two (ZNbKLSNd and PbNKLSNd) series of OFS glasses have been characterized by THz-time domain spectroscopy (THz-TDS) and optical reflection measurements and discussed through a comparison with previously reported data on selected silicate oxide and chalcogenide glasses
On the basis of Clausius-Mossotti relationship, THz and optical (λ=1.5 μm) dielectric constants have been correlated by a unified relationship using a parameter a which is defined by the ratio of the ionic polarizability to electronic polarizability for each glass series
Summary
Terahertz (THz) wave technology, which typically covers a frequency range of sub-THz to tens-THz, is demanded for the applications to a variety of systems including spectroscopy, communications, sensing and imaging due to the characteristic transmission and propagation properties of THz waves in various media [1,2,3]. If empirical Miller’s rule [9,10] can be applied in the THz range, high refractive index glasses are expected to exhibit a high nonlinearity, which merits their application to THz nonlinear functions including modulation, switching and wavelength conversion [11,12,13]. A variety of silicate oxide glasses with metal oxide modifiers and chalcogenide glasses which have high chemical/mechanical stability and desirable dielectric properties, e.g., high refractive index, high transparency and high optical nonlinearity, have been developed for the
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