AI Article Synopsis
- A new multi-mode refractive index sensor using coupler-free nanostructured split ring resonators (SRRs) is proposed, which detects changes in the local dielectric environment.
- The sensor's multiple reflectance peaks are analyzed using a standing-wave plasmonic resonance model, enhancing its design and sensitivity.
- Lower-order modes show higher sensitivity due to their stronger electromagnetic fields and shorter detection lengths, while higher-order modes allow for micron-scale detection suitable for intracellular bio-events.
Article Abstract
We present a coupler-free, multi-mode refractive index sensor based on nanostructured split ring resonators (SRRs). The fabricated SRR structures exhibit multiple reflectance peaks, whose spectral positions are sensitive to local dielectric environment and can be quantitatively described by our standing-wave plasmonic resonance model, providing a design rule for this multi-mode refractive-index (MMRI) sensor. We further manifest that the lower-order modes possess greater sensitivity associated with stronger localized electromagnetic field leading to shorter detection lengths within five hundreds nanometers, while the higher-order modes present mediate sensitivity with micron-scale detection lengths to allow intracellular bio-events detection. These unique merits enable the SRR-based sensor a multi-functional biosensor and a potential label-free imaging device.
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| http://dx.doi.org/10.1364/OE.18.009561 | DOI Listing |
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