Defect diamond-like tellurides as infrared nonlinear optical materials with giant second-harmonic generation tensor

ACd4Ga5Te12 (A = K, Rb, Cs): Tellurides with a Strong Nonlinear Optical Response and Purple Emission

“…Several absorption peaks appeared from 100 to 500 cm –1 . The most obvious Raman shift at 198 cm –1 can be assigned to the symmetric stretch of Cd–Te bonds, which corresponds well with the 195 cm –1 peak observed in CdGa 2 Te 4 . The peaks at 338 and 415 cm –1 are attributed to Ga–Te vibration modes, and it agrees well with the fact that the lighter weight of an atom always results in a higher stretching wavenumber .…”

High-Performance Flexible Broadband Photothermoelectric Photodetectors Based on Tellurium Films

“…High-performance mid- and far-infrared photodetectors can achieve photodetection of the infrared spectrum from 2.5 to 25 μm at room temperature, which is crucial in applications such as water quality testing, military surveillance, and optical radar. − Most commercial infrared photodetectors are made from narrow-band gap semiconductor materials like InGaAs and HgCdTe. However, these photodetectors have limitations such as complex manufacturing processes, high costs, and low-temperature operating conditions .…”

Wide band gap selenide infrared nonlinear optical materials AIIMg6Ga6Se16 with strong SHG responses and high laser-induced damage thresholds

“…1–8 In the ultraviolet (UV) and visible-near infrared (IR) regions, oxide-based NLO materials have achieved great progress, 9–13 and a series of NLO crystals with excellent performances like LiB 3 O 5 (LBO), BaB 2 O 4 (β-BBO), KBe 2 BO 3 F 2 (KBBF), KH 2 PO 4 (KDP), and NH 4 B 4 O 6 F have been developed in recent years, 14–18 while in the mid- and far-IR regions, the commercially available IR NLO materials like AgGaS 2 (AGS), AgGaSe 2 (AGSe) and ZnGeP 2 (ZGP) suffer from their intrinsic defects, like low laser-induced damage thresholds (LIDTs) in AGS and AGSe, strong two-photon absorption around ∼1 μm and narrow IR transparent range in ZGP. 19,20 Therefore, exploring new IR NLO materials with excellent performances has become an urgent need, but challenging due to the conflicts among NLO response, band gap, birefringence and IR transparent range in one material. 21…”