Steering and Encoding the Polarization of the Second Harmonic in the Visible with a Monolithic LiNbO3 Metasurface

被引:95
作者
Carletti, Luca [1 ]
Zilli, Attilio [2 ]
Moia, Fabio [3 ]
Toma, Andrea [3 ]
Finazzi, Marco [2 ]
De Angelis, Costantino [1 ]
Neshev, Dragomir N. [4 ]
Celebrano, Michele [2 ]
机构
[1] Univ Brescia, Dept Informat Engn, I-25123 Brescia, Italy
[2] Politecn Milan, Phys Dept, I-20133 Milan, Italy
[3] Ist Italiano Tecnol, I-16163 Genoa, Italy
[4] Australian Natl Univ, Res Sch Phys, ARC Ctr Excellence Transformat Metaopt Syst TMOS, Acton, ACT 2601, Australia
来源
ACS PHOTONICS | 2021年 / 8卷 / 03期
基金
澳大利亚研究理事会; 欧盟地平线“2020”;
关键词
nonlinear nanophotonics; nonlinear diffraction; lithium niobate; metasurface; second-harmonic generation; GENERATION;
D O I
10.1021/acsphotonics.1c00026
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Nonlinear metasurfaces constitute a key asset in meta-optics, given their ability to scale down nonlinear optics to sub-micrometer thicknesses. To date, nonlinear metasurfaces have been mainly realized using narrow band gap semiconductors, with operation limited to the nearinfrared range. Nonlinear meta-optics in the visible range can be realized using transparent materials with high refractive index, such as lithium niobate (LiNbO3). Yet, efficient operation in this strategic spectral window has been so far prevented by the nanofabrication challenges associated with LiNbO3, which considerably limit the aspect ratio and minimum size of the nanostructures (i.e., meta-atoms). Here we demonstrate the first monolithic nonlinear periodic metasurface based on LiNbO3 and operating in the visible range. Realized through ion beam milling, our metasurface features a second-harmonic (SH) conversion efficiency of 2.40 x 10(-8) at a pump intensity as low as 0.5 GW/cm(2). By tuning the pump polarization, we demonstrate efficient steering and polarization encoding into narrow SH diffraction orders, opening novel opportunities for polarization-encoded nonlinear meta-optics.
引用
收藏
页码:731 / 737
页数:7
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