Cavity-Coupled Plasmonic Device with Enhanced Sensitivity and Figure-of-Merit

Abstract

Using full-wafer processing, we demonstrate a sophisticated nanotechnology for the realization of an ultrahigh sensitive cavity-coupled plasmonic device that combines the advantages of Fabry-Perot microcavities with those of metallic nanostructures. Coupling the plasmonic nanostructures to a Fabry-Perot microcavity creates compound modes, which have the characteristics of both Fabry-Perot and localized surface plasmon resonance (LSPR) modes, boosting the sensitivity and figure-of-merit of the structure. The significant trait of the proposed device is that the sample to be measured is located in the substrate region and is probed by the compound modes. It is demonstrated that the sensitivity of the compound modes is much higher than that of LSPR of plasmonic nanostructures or the pure Fabry-Perot modes of the optical microcavity. The response of the device is also investigated numerically and the agreement between measurements and calculations is excellent. The key features of the device introduced in this work are applicable for the realization of ultrahigh sensitive plasmonic devices for biosensing, optoelectronics, and related technologies.

Peak splitting and locking behavior arising from Fano interference between localized surface plasmons and cavity modes

“…Similar peak splitting and peak locking behaviors have been observed in some previous investigations related to the LSP coupled cavities [36,37]. Using our model, these behaviors can also be quantitatively illustrated (detail can be found in Fig.…”

Manipulation of Quenching in Nanoantenna–Emitter Systems Enabled by External Detuned Cavities: A Path to Enhance Strong-Coupling

“…Information), showing a potential route to ameliorate the significant nonradiative emission in plasmonic systems that hinders its photonic detection. In addition, we note that F reported by previous hybrid cavity-nanoantenna structures[14][15][16] are about two orders of magnitude lower.The features of detuned FP-antenna hybrids studied in this work are general and potentially observable in previously proposed hybrid systems[27][28][29][30][31][32] by including single emitters,[13][14][15][16] with different cavity geometries[13][14][15][16]18,25,29,33 and nanoantenna structures 7,8. These open new avenues in diverse research areas such as sensing, surface-enhanced Raman scat-…”

Recent advances in nanoplasmonic biosensors: applications and lab-on-a-chip integration

“…The portable palmsized setup incorporates a simple two-channel microfluidics module that performs real-time evaluations. In fact, the authors were capable of detecting in a direct assay low [19]. © Copyright 2015 American Chemical Society.…”

“…Sensitivity can be significantly enhanced if appropriate nanostructures are designed, exploiting geometries that promote different resonance modes (i.e. surface-enhanced Raman [17], fano-like [18], and cavity mode [19] resonances) and also promoting the interaction in those areas of the nanostructure with enhanced EM field (i.e. hot spots) [20].…”