Abstract
Microcavity surface plasmon resonance sensors (MSPRSs) develop out of the classic surface plasmon resonance technologies and aim at producing novel lab-on-a-chip devices. MSPRSs generate a series of spectral resonances sensitive to minute changes in the refractive index. Related sensitivity studies and biosensing applications are published elsewhere. The goal of this work is to test the hypothesis that MSPRS resonances are standing surface plasmon waves excited at the surface of the sensor that decay back into propagating photons. Their optical properties (mean wavelength, peak width, and peak intensity) appear highly dependent on the internal morphology of the sensor and the underlying subwavelength aperture architecture in particular. Numerous optical experiments were designed to investigate trends that confirm this hypothesis. An extensive study of prior works was supportive of our findings and interpretations. A complete understanding of those mechanisms and parameters driving the formations of the MSPRS resonances would allow further improvement in sensor sensitivity, reliability, and manufacturability.
Highlights
The surface plasmon resonance (SPR) phenomenon has been studied extensively
An extensive literature exploration was necessary for understanding how such factors supported our main hypothesis: the standing SPW (SSPW) are responsible for the formation of the Microcavity surface plasmon resonance sensors (MSPRSs) resonances that are sensitive to changes in refractive index at sensor’s surface
Our work showed that an increase in the core diameter triggered an increase in the number of excited MSPRS resonances
Summary
1960s, exponential growth in the number of annual publications has been recorded [1,2]. The history of this field [1,2,3], classic reviews of the surface plasmons (SPs), the surface plasmon polaritons (SPPs), known as surface plasmon waves (SPWs), the SPR on flat metal films [4,5,6], the main differences between SPs and localized surface plasmons (LSPs) [7,8,9,10,11] as well as their applications were previously discussed [12,13,14,15].
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