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Polymer materials have become increasingly useful for photonic sensing applications. Their consistency and optical properties make them highly desirable for sensing possibilities. Bio-molecules, such as proteins, can be attached to a polymer substrate using a thin layer of gold nanoparticle. Gold nanoparticles (GNP) hold unique localized plasmon resonance (LSPR) properties, which are affected by their structure, shape, distribution, and their degree of penetration into the surrounding medium. As well, the dielectric properties of the medium influence LSPR responses. These characteristics, in turn, depend on the thermal history of the sample, that is, the extent and duration of heating of the polymer-GNP systems. In this work, we examine the specific effects of gradually increasing temperature through incremental heating on the LSPR response of GNP on various polymers, including cyclic olefin copolymer (COC), poly (methyl methacrylate) (PMMA), poly (dimethyl siloxane) (PDMS), SU-8, polycarbonate (PC) and polystyrene (PS). GNP on polymers manifested a shift in the LSPR peak response from 7 nm to 34 nm on average, and an important change in absorbance as well. These results will help enhance the sensing performance of microphotonic sensors by improving the shape of the LSPR band and selecting the ideal polymer material for specific applications. The information will also benefit other applications, including cell culture and biomolecular separation in a microfluidic environment. Furthermore, the findings herein may be employed towards developing a unidirectional temperature sensor.

Effect of Gradual Heating of Gold Nanoparticle Multilayers on Polymer Substrates on the Characteristics of their LSPR Bands