Optimal conditions for SPR-imaging of nano-objects

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• 作者：Alexander Zybin ; ^{alexander.zybin@isas.de" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Victoria ShpacovitchAuthor Vitae ; Julia SkolnikAuthor Vitae ; Roland Hergenrö ; derAuthor Vitae
• 关键词：Single nano particles ; SPR imaging ; Optimal detector parameters
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：239
• 期：Complete
• 页码：338-342
• 全文大小：783 K

文摘

Approaches commonly used for the description of surface plasmon resonance (SPR) presume infinite transverse dimensions of interacting layers. Obviously, the interaction of nano-sized objects with plasmon-generating surfaces contradicts this assumption. In the present work, a simple model accounting for the finite dimension of nano-objects is applied, explaining experimentally observed effects of SPR detection of such objects. The model considers the radiation of a plasmon appearing in the gold layer around a particle as a main factor of image formation. This secondary plasmon appears due to scattering of the primary plasmons excited in the gold layer near the SPR resonance. The new approach allows for the optimization of the angle of incidence as well as the sensor layer parameters, providing a more than 10-fold improvement of the sensitivity compared to using the parameters usually applied in classical SPR.