Stabilization of the Polar Structure and Giant Second-Order Nonlinear Response of Single Crystal γ-NaAs0.95Sb0.05Se2
Journal Article
·
· Advanced Functional Materials
- Northwestern Univ., Evanston, IL (United States)
- Pennsylvania State Univ., University Park, PA (United States)
- Argonne National Laboratory (ANL), Argonne, IL (United States)
The dearth of suitable materials significantly restricts the practical development of infrared (IR) laser systems with highly efficient and broadband tuning. Recently, γ-NaAsSe2 is reported, and it exhibits a large nonlinear second-harmonic generation (SHG) coefficient of 590 pm V—1 at 2 µm. However, the crystal growth of γ-NaAsSe2 is challenging because it undergoes a phase transition to centrosymmetric δ-NaAsSe2. Herein, the stabilization of non-centrosymmetric γ-NaAsSe2 by doping the As site with Sb, which results in γ-NaAs0.95Sb0.05Se2 is reported. The congruent melting behavior is confirmed by differential thermal analysis with a melting temperature of 450 °C and crystallization temperature of 415 °C. Single crystals with dimensions of 3 mm × 2 mm are successfully obtained via zone refining and the Bridgman method. The purification of the material plays a significant role in crystal growth and results in a bandgap of 1.78 eV and thermal conductivity of 0.79 Wm—1 K—1. The single-crystal SHG coefficient of γ-NaAs0.95Sb0.05Se2 exhibits an enormous value of |d11| = 648 ± 74 pm V—1, which is comparable to that of γ-NaAsSe2 and ≈20× larger than that of AgGaSe2. Importantly, the bandgap of γ-NaAs0.95Sb0.05Se2 (1.78 eV) is similar to that of AgGaSe2, thus rendering it highly attractive as a high-performing nonlinear optical material.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 2339561
- Alternate ID(s):
- OSTI ID: 1905899
- Journal Information:
- Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 9 Vol. 33; ISSN 1616-301X
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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