All-optical tunable wavelength conversion in opaque nonlinear nanostructures
All-optical tunable wavelength conversion in opaque nonlinear nanostructures
复制标题
不透明非线性纳米结构中的全光可调波长转换
DOI：
10.1515/nanoph-2022-0078
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发表时间：
2022-05
期刊：
影响因子：
7.5
通讯作者：
Jiannan Gao;M. Vincenti;J. Frantz;Anthony Clabeau;Xingdu Qiao;Liang Feng;M. Scalora;N. Litchinitser
中科院分区：
文献类型：
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作者：
Jiannan Gao;M. Vincenti;J. Frantz;Anthony Clabeau;Xingdu Qiao;Liang Feng;M. Scalora;N. Litchinitser
摘要：我们展示了一种简单的、飞秒级波长可调、亚波长厚的纳米结构，可以实现从红外到紫外的有效波长转换。可以通过改变红外泵浦光束的输入功率和/或控制光束相对于泵浦光束的相对延迟来调谐输出波长，并且不需要系统的任何外部重新对准。该纳米结构由硫系玻璃制成，具有强克尔非线性和高线性折射率，可在米氏共振下产生强烈的场增强。尽管与许多其他材料一样，硫属化物玻璃在紫外线范围内吸收，但泵浦和三次谐波信号的不均匀部分之间的基本锁相机制使得紫外线传输几乎没有吸收或没有吸收。
Abstract We demonstrate a simple, femtosecond-scale wavelength tunable, subwavelength-thick nanostructure that performs efficient wavelength conversion from the infrared to the ultraviolet. The output wavelength can be tuned by varying the input power of the infrared pump beam and/or relative delay of the control beam with respect to the pump beam, and does not require any external realignment of the system. The nanostructure is made of chalcogenide glass that possesses strong Kerr nonlinearity and high linear refractive index, leading to strong field enhancement at Mie resonances. Although, as many other materials, chalcogenide glasses absorb in the ultraviolet range, fundamental phase-locking mechanism between the pump and the inhomogeneous portion of the third-harmonic signal enables ultraviolet transmission with little or no absorption.