Lithium Niobate Nanocubes as Linear and Nonlinear Ultraviolet Mie Resonators
Lithium Niobate Nanocubes as Linear and Nonlinear Ultraviolet Mie Resonators
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DOI：
10.1021/acsphotonics.8b01594
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发表时间：
2019-02-01
期刊：
影响因子：
7
通讯作者：
Grange, Rachel
中科院分区：
文献类型：
--
作者：
Timpu, Flavia;Sendra, Joan;Grange, Rachel
用于全介电谐振器或超表面的许多介电和半导体材料在近红外到可见光范围内具有低吸收，但由于它们的低能带隙，它们在近紫外（NUV）范围内是有损耗的。与此相反，铁电体铌酸锂（LiNbO3，LNO）具有大于4eV的能带隙，因此在低至310nm的NUV范围内具有非常低的损耗。在这里，我们提出LNO纳米立方体作为一种新的替代材料的非线性光子学在NUV范围。我们报告了通过溶剂热合成制备的尺寸为200至300 nm的LNO纳米立方体由于Mie共振而在400 nm以下表现出强的二次谐波产生（SHG）发射，与360 nm处的散装LNO相比，SHG增强为10（7）。在这项工作中提出的LNO纳米立方体是新型高效的全介电米氏共振纳米结构的NUV具有广泛的可能的光子应用，从纳米光刻到超表面和复杂的组装的纳米结构或纳米光调制器。
Many dielectric and semiconductor materials used for all-dielectric resonators or metasurfaces have low absorption in the near-infrared to visible range, but they are lossy in the near-ultraviolet (NUV) range due to their low energy band gap. Contrary to this, the ferroelectric lithium niobate (LiNbO3, LNO) has an energy band gap larger than 4 eV and, consequently, very low losses in the NUV range down to 310 nm. Here, we propose LNO nanocubes as a new alternative material for nonlinear photonics in the NUV range. We report that LNO nanocubes fabricated by solvothermal synthesis with sizes from 200 to 300 nm demonstrate strong second harmonic generation (SHG) emission below 400 nm due to Mie resonances, with an SHG enhancement of 10(7) compared to bulk LNO at 360 nm. The LNO nanocubes presented in this work are novel efficient all-dielectric Mie resonant nanostructures for the NUV with a wide range of possible photonic applications, from nanophotolithography to metasurfaces and complex assemblies of nanostructures or nano-optical modulators.