Unravelling interrelations between chemical composition and refractive index dispersion of infrared-transmitting chalcogenide glasses. Issue 1 (December 2018)

• Record Type: Journal Article
• Authors: Lee, Jun; Choi, Ju; Yi, Jeong; Lee, Woo; Lee, Eui; Choi, Yong
• Is Part Of: Scientific reports. Volume 8:Issue 1(2018)
• Page Start: 1
• Page End: 10
• Publication Date: 2018-12
• Subjects: Natural history -- Research -- Periodicals; Biology -- Research -- Periodicals; Physical sciences -- Research -- Periodicals; Earth sciences -- Research -- Periodicals; Environmental sciences -- Research -- Periodicals; 502.85
• DOI: 10.1038/s41598-018-33824-x
• Languages: English
• ISSNs: 2045-2322

Abstract

Abstract A facile procedure for compositional screening of chalcogenide glass (CG) is proposed to manage its infrared transmission edge (ω c ) as well as refractive index dispersion (ν ) in the long-wavelength infrared (LWIR) range. Bothω c andν of CG turn out to be interpretable simply in connection with its chemical composition based on a postulation that CG behaves as a single average harmonic oscillator (SAHO). In this SAHO model, ω c is expressed as a function of molar mass and average bond energy, both of which are easily accessible for a given CG composition. Two prototypical CG-forming systems in Ge-Sb-Se and Ge-Sb-S compositions exemplify the empirical compositional dependence ofω c, which further plays a decisive role in determiningν . Following the present approach, a set of highly dispersive CG compositions in the Ge-Sb-S system is newly unveiled together with low-dispersion Ge-Sb-Se glasses. It is then experimentally demonstrated that a doublet lens configuration consisting of convex and concave lenses with low and highν values, respectively, is able to reduce the optical aberrations. This finding presents an opportunity thatν can be envisaged just based on the compositional ratio of CG, thus facilitating completion of the LWIR Abbe diagram.