Diamond-like semiconductors (DLSs) are of interest due to their compositional flexibility, tunable nature, and potential application in nonlinear optics (NLO), particularly second harmonic generation (SHG) in the infrared. All DLSs possess a noncentrosymmetric crystal structure and are, therefore, potential SHG candidates. The second-order NLO properties of these materials can be tuned in the IR region by using a wide range of predictable compositions. The majority of benchmark IR-NLO materials are DLSs, but quaternary lithium-containing DLSs with the general formula of I2-II-IV-VI4 are not prevalent in literature due to the difficulty in synthesizing phase-pure materials. As a result of selecting lithium as the monovalent ion in DLS materials, the band gap is expected to widen. The wider band gap is anticipated to result in a higher laser damage threshold, which can lead to the possibility for high power NLO applications.

Potential nonlinear optical applications for high-temperature solid state and lithium polysulfide flux synthesized diamond-like semiconductors, Li2-II-IV-S4

251st National Meeting (2016)

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