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Stabilization of the Polar Structure and Giant Second-Order Nonlinear Response of Single Crystal γ-NaAs0.95Sb0.05Se2

Journal Article · · Advanced Functional Materials
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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