Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 15, Pages 17711-17717Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b23085
Keywords
indium selenide; defect and distortion; NLO materials; second harmonic generation; theoretical calculations
Funding
- NSF of China [21771159]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Qing Lan project from Yangzhou University
- Foundation of Excellent Doctoral Dissertation of Yangzhou University
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The balance between second harmonic generation (SHG) intensity and laser-induced damage threshold (LIDT), together with phase-matchable behavior, is the key point for exploration of novel nonlinear optical (NLO) materials. In this work, the NLO property of defect wurtzite-type hexagonal-In2Se3 (gamma) is extensively explored first. It exhibits a strong SHG intensity of 2.6 x AgGaS2 (AGS) at 2.1 mu m, and a high powder LIDT of 7.3 x AGS. From wurtzite to gamma-In2Se3, the birefringence changes from 0.003 to 0.075, resulting in the phase-matchable phenomenon of gamma-In2Se3. This is well ascribed to the contribution of the unique InSe5 unit in gamma-In2Se3 from the result of birefringence calculation and analysis.
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