Light-controllable Fano resonance in azo-dye-doped all-dielectric multilayer structure
Light-controllable Fano resonance in azo-dye-doped all-dielectric multilayer structure
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DOI：
10.1063/1.5091820
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发表时间：
2019-06
影响因子：
3.2
通讯作者：
Ken Motokura;Byungjun Kang;M. Fujii;D. Nesterenko;Z. Sekkat;S. Hayashi
中科院分区：
文献类型：
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作者：
Ken Motokura;Byungjun Kang;M. Fujii;D. Nesterenko;Z. Sekkat;S. Hayashi
对于包含偶氮染料掺杂层的全电介质多层系统，演示了光对法诺共振的主动调制。研究的样品由掺杂有分散红 1（偶氮染料）分子的聚苯乙烯层、聚乙烯醇层和纯聚苯乙烯层组成。在 Kretschmann 衰减全反射配置中，在蓝光泵浦下用蓝色探测光测量样品的角扫描反射光谱。人们发现法诺线形状会根据泵浦光的强度而系统地变化。基于层中光谱和场分布的电磁计算的分析表明，观察到的法诺共振是由偶氮染料掺杂层支持的宽半泄漏导模与纯聚苯乙烯层支持的尖锐平面波导模式之间的耦合产生的。泵浦光照射下法诺线形状的系统变化可以通过偶氮染料掺杂聚苯乙烯层中光吸收的系统减少来很好地理解；光吸收的减少是由于偶氮染料分子的光异构化导致该层的消光系数降低。对于包含偶氮染料掺杂层的全电介质多层系统，证明了光对法诺共振的主动调制。研究的样品由掺杂有分散红 1（偶氮染料）分子的聚苯乙烯层、聚乙烯醇层和纯聚苯乙烯层组成。在 Kretschmann 衰减全反射配置中，在蓝光泵浦下用蓝色探测光测量样品的角扫描反射光谱。人们发现法诺线形状会根据泵浦光的强度而系统地变化。基于层中光谱和场分布的电磁计算的分析表明，观察到的法诺共振是由偶氮染料掺杂层支持的宽半泄漏导模与纯聚苯乙烯层支持的尖锐平面波导模式之间的耦合产生的。泵浦光照射下法诺线形状的系统变化可以通过光吸收的系统减少来很好地理解...
Active modulation of Fano resonance by light is demonstrated for an all-dielectric multilayer system containing an azo-dye-doped layer. The sample studied consists of a polystyrene layer doped with disperse red 1 (azo dye) molecules, a polyvinyl alcohol layer, and a pure polystyrene layer. In a Kretschmann attenuated-total-reflection configuration, angle-scan reflection spectra of the sample were measured with blue probe light under blue light pumping. The Fano line shape was found to change systematically depending on the intensity of the pump light. Analyses based on electromagnetic calculations of the spectra and field distributions in the layers indicate that the Fano resonance observed is generated by coupling between a broad half-leaky guided mode supported by the azo-dye-doped layer and a sharp planar waveguide mode supported by the pure polystyrene layer. The systematic changes in the Fano line shape under pump light irradiation can be well understood by a systematic decrease in light absorption in the azo-dye-doped polystyrene layer; the decrease in light absorption is due to a decrease in the extinction coefficient of the layer arising from the photoisomerization of azo dye molecules.Active modulation of Fano resonance by light is demonstrated for an all-dielectric multilayer system containing an azo-dye-doped layer. The sample studied consists of a polystyrene layer doped with disperse red 1 (azo dye) molecules, a polyvinyl alcohol layer, and a pure polystyrene layer. In a Kretschmann attenuated-total-reflection configuration, angle-scan reflection spectra of the sample were measured with blue probe light under blue light pumping. The Fano line shape was found to change systematically depending on the intensity of the pump light. Analyses based on electromagnetic calculations of the spectra and field distributions in the layers indicate that the Fano resonance observed is generated by coupling between a broad half-leaky guided mode supported by the azo-dye-doped layer and a sharp planar waveguide mode supported by the pure polystyrene layer. The systematic changes in the Fano line shape under pump light irradiation can be well understood by a systematic decrease in light absorption i...