One Spot-Two Sensors: Porous Silicon Interferometers in Combination With Gold Nanostructures Showing Localized Surface Plasmon Resonance.
作者： Ruth Fabiola Balderas-Valadez , Robin Schürmann , Claudia Pacholski
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摘要: Sensors composed of a porous silicon monolayer covered with gold nanoparticles, which provide two optical signal transduction methods, are fabricated and thoroughly characterized concerning their sensing performance. For this purpose, substrates were electrochemically etched in order to obtain monolayers, subsequently immersed salt solution facilitating the formation nanoparticle layer on top silicon. The deposition process was monitored by reflectance spectroscopy, appearance dip interference pattern observed. This can be assigned absorption light deposited nanoparticles leading localized surface plasmon resonance. bulk sensitivity these sensors determined recording spectra media having different refractive indices compared exclusively based or nanoparticles. A thorough analysis resulting shifts signals wavelength scale indicated that response sensor is not influenced presence nanostructure top. Moreover, adsorption thiol-terminated polystyrene solely detected changes position spectrum, resonance from shifted longer wavelengths indicating independence nanostructures, namely index pointing successful realization one spot.
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