arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.00894physics.optics
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用于二次谐波信号增强的TMDC谐振器

TMDC Resonators for Second Harmonic Signal Enhancement

Sebastian Busschaert, René Reimann, Moritz Cavigelli, Ronja Khelifa, Achint Jain, Lukas Novotny

摘要:

过渡金属二硫属化合物(TMDCs)除了具有强的非线性光学响应外,还在可见光和红外区具有高折射率。因此,通过将这些TMDC图案化成介电纳米谐振器,可以产生高度受限的电磁模式。TMDC纳米谐振器的受控制造不仅增强了材料的固有非线性响应,而且还允许通过纳米谐振器阵列对发射进行空间成形。在这里,我们制作图案化的WS2磁盘,支持高的内部谐振电场,并显示在可见光区的二次谐波(SH)产生的强烈增强。此外,我们组装的WS2磁盘阵列空间直接的相干SH发射,在类比相控阵天线。最后,我们调查和讨论的区域发射起源和强度的测量SH信号,我们发现依赖于所使用的散装WS2的材料变化的巨大差异。

英文摘要:

In addition to their strong nonlinear optical response, transition metal dichalcogenides (TMDCs) possess a high refractive index in the visible and infrared regime. Therefore, by patterning those TMDCs into dielectric nanoresonators, one can generate highly confined electromagnetic modes. Controlled fabrication of TMDC nanoresonators does not only enhance the material's intrinsic nonlinear response, but also allows for spatially shaping the emission via nanoresonator arrays. Here we fabricate patterned WS2 disks that support a high internal resonant electric field and show strong enhancement of second harmonic (SH) generation in the visible regime. In addition, we assemble the WS2 disks in arrays to spatially direct the coherent SH emission, in analogy to phased array antennas. Finally, we investigate and discuss drastic differences in the areal emission origin and intensity of the measured SH signals, which we find to depend on material variations of the used bulk WS2.

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