当前位置：
X-MOL 学术
›
Adv. Opt. Mater.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Multiwavelength Surface‐Enhanced Raman Spectroscopy Using Rainbow Trapping in Width‐Graded Plasmonic Gratings
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-01-02 , DOI: 10.1002/adom.201701136 Nastaran Kazemi-Zanjani 1 , Moein Shayegannia 1 , Rajiv Prinja 1 , Arthur O. Montazeri 1 , Aliakbar Mohammadzadeh 2 , Katelyn Dixon 1 , Siqi Zhu 3 , Ponnambalam R. Selvaganapathy 2 , Anna Zavodni 3 , Naomi Matsuura 3, 4 , Nazir P. Kherani 1, 4
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-01-02 , DOI: 10.1002/adom.201701136 Nastaran Kazemi-Zanjani 1 , Moein Shayegannia 1 , Rajiv Prinja 1 , Arthur O. Montazeri 1 , Aliakbar Mohammadzadeh 2 , Katelyn Dixon 1 , Siqi Zhu 3 , Ponnambalam R. Selvaganapathy 2 , Anna Zavodni 3 , Naomi Matsuura 3, 4 , Nazir P. Kherani 1, 4
Affiliation
|
Plasmonic gratings of rectangular groove profile with gradient in the groove width perform as unique surface‐enhanced Raman spectroscopy (SERS) substrates by simultaneously confining multiple laser wavelengths proximally and inside their rectangular nanotrenches. These gratings consist of a metal–insulator–metal (MIM) groove of 40 nm width at the center, surrounded by grooves with widths increasing in 10 nm steps to a maximum of 180 nm. It is experimentally shown and theoretically confirmed that upon illumination a maximally enhanced electromagnetic field is generated at the center of these gratings as a result of plasmonic light trapping as well as waveguiding produced by the surrounding grooves. SERS enhancement factors of 106–107 are demonstrated for 20 μL min−1 flow of 1 × 10−3m aqueous phospholipid solution using 532, 638, and 785 nm laser illumination of the gratings integrated within microfluidic devices. These robust multiwavelength SERS substrates offer highly reproducible plasmonic field enhancement that can be tuned to cover broad wavelength ranges within the visible and near‐infrared regime and are ideal for static and dynamic characterization of low concentration species. Further, the multispectral characteristic of these gratings facilitates multiplexing through various laser wavelengths thereby making it possible to readily access weak or silent Raman modes.
中文翻译：
多波长表面增强拉曼光谱在宽度梯度等离激元光栅中使用彩虹捕获。
矩形凹槽轮廓的等离子光栅在凹槽宽度中具有梯度，它通过同时在近端和矩形纳米沟槽内部限制多个激光波长，作为独特的表面增强拉曼光谱（SERS）基板。这些光栅由中心处宽度为40 nm的金属-绝缘体-金属（MIM）凹槽组成，周围是宽度以10 nm为步长增加到最大180 nm的凹槽。实验表明并从理论上证实，由于等离子光的捕获以及周围沟槽产生的波导，在照明时，在这些光栅的中心会产生最大程度增强的电磁场。的10 SERS增强因子6 -10 7被证实为20μL分钟-1使用532、638和785 nm激光照射集成在微流控设备中的光栅，使1×10 -3 m磷脂水溶液流动。这些坚固的多波长SERS基板可提供高度可重现的等离子体场增强功能，可对其进行调谐以覆盖可见光和近红外范围内的宽波长范围，是低浓度物质静态和动态表征的理想选择。此外，这些光栅的多光谱特性有利于通过各种激光波长的多路复用，从而使得可以容易地访问弱或无声拉曼模式。
更新日期：2018-01-02
中文翻译：
多波长表面增强拉曼光谱在宽度梯度等离激元光栅中使用彩虹捕获。
矩形凹槽轮廓的等离子光栅在凹槽宽度中具有梯度，它通过同时在近端和矩形纳米沟槽内部限制多个激光波长，作为独特的表面增强拉曼光谱（SERS）基板。这些光栅由中心处宽度为40 nm的金属-绝缘体-金属（MIM）凹槽组成，周围是宽度以10 nm为步长增加到最大180 nm的凹槽。实验表明并从理论上证实，由于等离子光的捕获以及周围沟槽产生的波导，在照明时，在这些光栅的中心会产生最大程度增强的电磁场。的10 SERS增强因子6 -10 7被证实为20μL分钟-1使用532、638和785 nm激光照射集成在微流控设备中的光栅，使1×10 -3 m磷脂水溶液流动。这些坚固的多波长SERS基板可提供高度可重现的等离子体场增强功能，可对其进行调谐以覆盖可见光和近红外范围内的宽波长范围，是低浓度物质静态和动态表征的理想选择。此外，这些光栅的多光谱特性有利于通过各种激光波长的多路复用，从而使得可以容易地访问弱或无声拉曼模式。
京公网安备 11010802027423号