Please use this identifier to cite or link to this item: https://doi.org/10.1038/s41566-022-01021-y
Title: Giant second-harmonic generation in ferroelectric NbOI2
Authors: Abdelwahab, Ibrahim 
Tilmann, Benjamin
Wu, Yaze
Giovanni, David
Verzhbitskiy, Ivan
Zhu, Menglong 
Berte, Rodrigo
Xuan, Fengyuan 
Menezes, Leonardo de S
Eda, Goki 
Sum, Tze Chien 
Quek, Su Ying 
Maier, Stefan A
Loh, Kian Ping 
Keywords: Science & Technology
Physical Sciences
Optics
Physics, Applied
Physics
OPTICAL-PROPERTIES
CRYSTAL-STRUCTURE
QUASI-PARTICLE
SEMICONDUCTORS
ELLIPSOMETRY
TRANSISTORS
DISPERSION
CR
Issue Date: 30-Jun-2022
Publisher: NATURE PORTFOLIO
Citation: Abdelwahab, Ibrahim, Tilmann, Benjamin, Wu, Yaze, Giovanni, David, Verzhbitskiy, Ivan, Zhu, Menglong, Berte, Rodrigo, Xuan, Fengyuan, Menezes, Leonardo de S, Eda, Goki, Sum, Tze Chien, Quek, Su Ying, Maier, Stefan A, Loh, Kian Ping (2022-06-30). Giant second-harmonic generation in ferroelectric NbOI2. NATURE PHOTONICS. ScholarBank@NUS Repository. https://doi.org/10.1038/s41566-022-01021-y
Abstract: Implementing nonlinear optical components in nanoscale photonic devices is challenged by phase-matching conditions requiring thicknesses in the order of hundreds of wavelengths, and is disadvantaged by the short optical interaction depth of nanometre-scale materials and weak photon–photon interactions. Here we report that ferroelectric NbOI2 nanosheets exhibit giant second-harmonic generation with conversion efficiencies that are orders of magnitude higher than commonly reported nonlinear crystals. The nonlinear response scales with layer thickness and is strain- and electrical-tunable; a record >0.2% absolute SHG conversion efficiency and an effective nonlinear susceptibility χeff(2) in the order of 10−9 m V−1 are demonstrated at an average pump intensity of 8 kW cm–2. Due to the interplay between anisotropic polarization and excitonic resonance in NbOI2, the spatial profile of the polarized SHG response can be tuned by the excitation wavelength. Our results represent a new paradigm for ultrathin, efficient nonlinear optical components.
Source Title: NATURE PHOTONICS
URI: https://scholarbank.nus.edu.sg/handle/10635/228886
ISSN: 17494885
17494893
DOI: 10.1038/s41566-022-01021-y
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