Plasmonic-Silver Sorets and Dielectric-Nd2O3 nanorods for Ultrasensitive Photonic Crystal-Coupled Emission

Cellphone-Aided Attomolar Zinc Ion Detection Using Silkworm Protein-Based Nanointerface Engineering in a Plasmon-Coupled Dequenched Emission Platform

“…In spite of exceptional plasmonic properties of AuNPs in visible and NIR optical regions with practical versatility for surface bio-functionalization, their quenching influence has remained an inevitable trade-off for utility in the SPCE platform. The “zone of inactivity” produced for fluorophores in <5 nm range from the Au surface is predominantly due to the coupling of fluorescent moieties to higher-order plasmonic modes that hasten the nonradiative pathways. − While this is the situation with bare AuNPs, recently, the so-called “quenching the quenched” phenomenon is demonstrated on account of plasmon intermixing or intercoupling in nanocavities, which eventually results in new superimposed modes that sustain improved radiative decay channels. − Consequently, the emitted photons are significantly increased at the far field from such nanogaps (near-field interfacial interaction). − Overall, this inadequacy of quenching encountered in experiments has been addressed using different approaches in the past few years and briefly listed as: (i) nanocavities generated with intense hotspots from nanogaps, (ii) metal–dielectric core–shell architectures, (iii) metal–dielectric-decorated nanointerfaces, and (iv) nanostructures with sharp tips and crevices (tip-core plasmons). − However, these methodologies present limitations of complex synthetic strategies (not-bioinspired) in nanofabrication with experimental artifacts apart from presenting moderate SPCE enhancements (<200-fold). Hence, the need for three-dimensional hotspots with heterometallic nanoassemblies has gained significant importance toward realizing dequenched and augmented SPCE enhancements.…”

Plasmonic random laser enabled artefact-free wide-field fluorescence bioimaging: uncovering finer cellular features

“…Anisotropic metal nanostructures possess broad plasmonic features due to multiple resonances, which can be utilized to achieve optimum spectral overlap with the gain medium in a random lasing system. [43][44][45][46][47] This can help in increasing the gain coupling without inducing substantial plasmonic losses. Here, we use one-dimensional silver nanostructures as the plasmonic scatterers as they offer better tunability and ease in fabrication among anisotropic structures.…”

Sericin-Based Bio-Inspired Nano-Engineering of Heterometallic AgAu Nanocubes for Attomolar Mefenamic Acid Sensing in the Mobile Phone-Based Surface Plasmon-Coupled Interface

“…Earlier works emphasize the utility of different structural types of plasmonic nanomaterials for fluorescence-based sensing applications. 8,11,12,18 This includes nanomaterials of different shapes (rods, triangles, cubes, stars) and assembled structures (dimers, trimers, tetramers) for generation of EM hotspots with augmented field intensity. Among such explorations, nanorods have gained increased attention on account of their ability to sustain the so-called lightning rod effect.…”