Influence of the dielectric substrate on the effective optical constants of silver plasmonic films

Perera M. N. M. N.; Schmidt D.; Gibbs W. E. K.; Juodkazis S.; Stoddart P. R.

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Influence of the dielectric substrate on the effective optical constants of silver plasmonic films

机译：介电基板对银浆膜有效光学常数的影响

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The effective optical properties of plasmonic thin films can be used to model the far-field response of nanostructured materials to an incident electromagnetic field. In the present work, optically thin nanostructured silver (Ag) plasmonic films were fabricated on transparent dielectric substrates of soda-lime glass, sapphire, and fused silica using oblique angle deposition. The influence of the underlying dielectric substrate on the effective optical properties of the nanostructured layer was investigated by an ellipsometric-optical model based on Mueller matrix ellipsometry. The wavelength-dependent uniaxial optical responses of the nanostructured Ag films fabricated on sapphire were modeled with three Gaussian and one Tanguy oscillator, representing key optical phenomena over the range from 300 to 1000 nm. In comparison with the same Ag films on glass, the results confirm that the effective optical properties cannot be considered in isolation from the substrate. As expected, the extinction peak associated with the localized surface plasmon resonance was redshifted by approximately 220 nm per unit of the substrate refractive index. Importantly, it was found that the direction of incidence also influences the film behavior, with a substantial redshift in the extinction peak for light directed through the dielectric compared to free-space illumination. This property can have a significant effect on the far-field performance of these films. (C) 2019 Optical Society of America

机译：等离子体薄膜的有效光学性能可用于将纳米结构材料的远场响应模拟到入射电磁场。在本作工作中，使用倾斜角沉积在钠钙玻璃，蓝宝石和熔融二氧化硅的透明介电基板上制造光学薄纳米结构银（Ag）等离子体膜。基于Mueller基质椭圆形测定法研究了基础介电基板对纳米结构层的有效光学性质的影响。在蓝宝石上制造的纳米结构型Ag膜的波长依赖性单轴光学响应用三个高斯和一个凝结振荡器进行建模，表示键光学现象范围为300至1000nm。与玻璃上相同的Ag膜相比，结果证实不能从基板隔离地考虑有效的光学性质。如所预期的，与局部表面等离子体共振相关的消光峰被每单位衬底折射率的约220nm被红移。重要的是，发现入射方向也影响薄膜行为，与自由空间照明相比，通过电介质指导光的光消耗峰值。该物业对这些胶片的远场性能产生显着影响。（c）2019年光学学会

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《Applied optics》 |2019年第22期|共7页
作者
Perera M. N. M. N.; Schmidt D.; Gibbs W. E. K.; Juodkazis S.; Stoddart P. R.;
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Swinburne Univ Technol Ctr Quantum &

Opt Sci Hawthorn Vic 3122 Australia;

Natl Univ Singapore Singapore Synchrotron Light Source Singapore 117603 Singapore;

Swinburne Univ Technol Ctr Quantum &

Opt Sci Hawthorn Vic 3122 Australia;

Swinburne Univ Technol Ctr Microphoton Hawthorn Vic 3122 Australia;

Swinburne Univ Technol Ctr Quantum &

Opt Sci Hawthorn Vic 3122 Australia;

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Influence of the dielectric substrate on the effective optical constants of silver plasmonic films

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