Nanoscale Broadband Deep-Ultraviolet Light Source from Plasmonic Nanoholes
Nanoscale Broadband Deep-Ultraviolet Light Source from Plasmonic Nanoholes
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DOI：
10.1021/acsphotonics.9b00127
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发表时间：
2019-03
期刊：
影响因子：
7
通讯作者：
Liping Shi;J. Andrade;J. Yi;Marius Marinskas;C. Reinhardt;E. Almeida;U. Morgner;M. Kovacev
中科院分区：
文献类型：
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作者：
Liping Shi;J. Andrade;J. Yi;Marius Marinskas;C. Reinhardt;E. Almeida;U. Morgner;M. Kovacev
我们利用宽带钛宝石飞秒振荡器在矩形等离子体纳米孔中同时发射了两个局域表面等离子体模。这两个模式的共振频率与我们的激光光谱很好地匹配。因此，纳米孔不仅有效地提高了三次谐波的辐射强度，而且显著拓宽了三次谐波的带宽，产生了240-300 nm范围内的纳米级深紫外光光源。当激光偏振方向与长边成60°，而不是通常使用的90°时，由于两个模的参与，三次谐波光束变为椭圆偏振并达到最大光强。
We employ a broadband Ti:sapphire femtosecond oscillator to simultaneously launch two localized surface plasmon modes in rectangular plasmonic nanoholes. The resonant frequencies of these two modes match well with our laser spectrum. As a result, the nanoholes do not only efficiently boost the third harmonic radiation intensity, but also significantly broaden the harmonic’s bandwidth, producing a nanoscale deep-ultraviolet light source in the range of 240 to 300 nm. Due to the involvement of two modes, the third harmonic beam becomes elliptically polarized and reaches its maximum intensity when laser polarization direction is 60° with respect to the long edges, rather than the commonly used 90°.