arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1706.07563physics.optics
收藏

非线性超颖表面:非线性光学的一种范式转变

Nonlinear Metasurfaces: A Paradigm Shift in Nonlinear Optics

Alexander Krasnok, Mykhailo Tymchenko, Andrea Alu

摘要:

频率转换过程,如二次和三次谐波产生,是非线性光学中最常见的效应之一,为光子学、化学、材料科学、表征和生物传感提供了许多机会。鉴于天然材料固有的弱非线性响应,人们通常依赖于光学大样本和复杂的相位匹配技术来实现非线性效应。然而,将这些方法直接转化为小尺寸是非常具有挑战性的,因为在不达到导致材料击穿的极高光强度的情况下,不能诱导与线性响应局部相当的非线性效应。由于这个原因,寻求合成在中等输入强度下具有增强的光学非线性的新型材料是非常活跃的。在过去的十年中,人们引入了几种设计人造材料、超材料和超表面非线性特性的方法。在这里,我们回顾了小尺度非线性光学领域的当前技术水平,特别强调从等离子体超颖表面产生高次谐波,包括基于等离子体和高折射率介质谐振器的超颖表面,以及负载等离子体超颖表面。我们讨论了特定的电磁场配置的有效谐波产生的作用,包括磁偶极子,法诺共振,和anapole的。我们还讨论了最新的进展,在控制所产生的非线性波的相位前配置文件,使非线性元表面组成的纳米谐振器与明智的定制形状。最后,我们比较可行的方法,以提高非线性无相位匹配的约束条件下的超颖表面,并提供了一个角度和展望这个令人兴奋的领域的未来发展。

英文摘要:

Frequency conversion processes, such as second- and third-harmonic generation, are one of the most common effects in nonlinear optics which offer many opportunities for photonics, chemistry, material science, characterization, and biosensing. Given the inherently weak nonlinear response of natural materials, one typically relies on optically large samples and complex phase-matching techniques to achieve nonlinear effects. A direct translation of these approaches to small dimensions, however, is extremely challenging, because nonlinear effects locally comparable to the linear response cannot be induced without reaching extremely high light intensities leading to the material breakdown. For this reason, the quest to synthesize novel materials with enhanced optical nonlinearities at moderate input intensities is very active nowadays. In the last decade, several approaches to engineering the nonlinear properties of artificial materials, metamaterials, and metasurfaces have been introduced. Here, we review the current state of the art in the field of small-scale nonlinear optics, with special emphasis on high-harmonic generation from ultrathin metasurfaces, including those based on plasmonic and high-index dielectric resonators, as well as semiconductor-loaded plasmonic metasurfaces. We discuss the role of specific electromagnetic field configurations for efficient harmonic generation, including magnetic dipole, Fano resonance, and anapole ones. We also discuss the most recent advances in controlling the phase front profiles of generated nonlinear waves enabled by nonlinear metasurfaces consisting of nanoresonators with judiciously tailored shapes. Finally, we compare viable approaches to enhance nonlinearities without phase matching constraints in ultrathin metasurfaces, and offer a perspective and outlook on the future development of this exciting field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑