Generating Third Harmonic Vacuum Ultraviolet Light with a TiO2 Metasurface

Michael Semmlinger, Ming Zhang, Ming Lun Tseng, Tzu Ting Huang, Jian Yang, Din Ping Tsai, Peter Nordlander, Naomi J. Halas*

*此作品的通信作者

研究成果: Article同行評審

54 引文 斯高帕斯(Scopus)

摘要

Dielectric metasurfaces have recently been shown to provide an excellent platform for the harmonic generation of light due to their low optical absorption and to the strong electromagnetic field enhancement that can be designed into their constituent meta-atoms. Here, we demonstrate vacuum ultraviolet (VUV) third harmonic generation from a specially designed dielectric metasurface consisting of a titanium dioxide (TiO2) nanostructure array. The metasurface was designed to enhance the generation of VUV light at a wavelength of 185 nm by tailoring its geometric design parameters to achieve an optical resonance at the fundamental laser wavelength of 555 nm. The metasurface exhibits an enhancement factor of nominally 180 compared to an unpatterned TiO2 thin film of the same thickness, evidence of strong field enhancement at the fundamental wavelength. Mode analysis reveals that the origin of the enhancement is an anapole resonance near the pump wavelength. This work demonstrates an effective strategy for the compact generation of VUV light that could enable expanded access to this useful region of the electromagnetic spectrum.

原文English
頁(從 - 到)8972-8978
頁數7
期刊Nano letters
19
發行號12
DOIs
出版狀態Published - 11 12月 2019

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