Plasmonic resonance in randomly distributed Au nanowells array

초록

Surface plasmon resonance (SPR) sensors have widely recognized as valuable tools in chemical and biological sensing technology [1, 2]. A conventional SPR sensor is usually based on the attenuated total reflection configuration [3], in which an incident beam is coupled through a prism on a glass side coated with the metal thin film. In recent years, metallic nanostructures have drawn intensive attention for SPR signal amplification. The plasmonic grooves with a few nanometers deep and wide act as guides and resonators leading to a very strong absorption of visible light [4]. Tuning of plasmonic resonance can be achieved through variation in width and depth of groove. Moreover, the field enhancement in grooves becomes a thousand times larger than the one of the impinging light. Based on these characteristics, narrow groove based sensor has been investigated [5].