Abstract
Abstract A variety of materials such as low dimensional carbon substrates (1D, 2D, and 3D), nanoprisms, nanocubes, proteins, ceramics, and DNA to name a few, have been explored in surface plasmon-coupled emission (SPCE) platform. While these offer new physicochemical insights, investigations have been limited to silver as primary plasmonic material. Although, gold nanoparticles (AuNPs) exhibit robust performance, its intrinsic property to quench the emission from radiating dipoles (at distances < 5 nm) has impeded its utility. Despite the use of metal-dielectric resonances (with Au decorated SiO2 NPs) and sharp nanotips (from Au nanostars) for dequenching the emission, the enhancements obtained has been less than 200-fold in SPCE platform. To address these long-standing challenges, we demonstrate the utility of gold soret colloids (AuSCs) and photonic crystal-coupled emission (PCCE) platform. The soret nano-assemblies synthesized using adiabatic cooling technique presented integrated hotspots when taken with high refractive index Nd2O3 ‘Huygens sources’. The collective and coherent coupling between localized Mie and delocalized Bragg plasmons (of sorets), dielectric plasmons (of Nd2O3), highly confined and intense Bloch surface waves (of PCCE platform) aided in realization of dequenched, as well as amplified > 1500-fold enhancements at the photoplasmonic nanocavity interface, presenting new opportunities for multidisciplinary applications.
Highlights
Nanophotonics, nanoplasmonics and their synergistic combination play a central role in the emerging technological revolution [1,2,3,4,5,6,7]
Despite the use of metal-dielectric resonances and sharp nanotips for dequenching the emission, the enhancements obtained has been less than 200-fold in surface plasmon-coupled emission (SPCE) platform. To address these longstanding challenges, we demonstrate the utility of gold soret colloids (AuSCs) and photonic crystal-coupled emission (PCCE) platform
In order to address these dual limitations of loss in SPCE platform and quenching with the usage of AuNPs, in this report, we propose the utility of photonic crystalcoupled emission (PCCE) platform [31, 32]
Summary
Nanophotonics, nanoplasmonics and their synergistic combination play a central role in the emerging technological revolution [1,2,3,4,5,6,7]. Single-molecule detection (at zeptomolar concentration) of stress hormone, cortisol has been achieved experimentally thereby confirming PCCE as a powerful technique [32] In light of this background, here we observed that the use of AuNPs in PCCE platform presented dequenched and enhanced emission (278-fold enhancements), that has not been reported hitherto. Silver sorets have been extensively studied in SPCE platform toward Purcell-enhanced femtomolar sensing of a biologically relevant molecule (glutathione) with excellent reliability [21] In light of these observations, the adiabatic cooling technique was employed to fabricate stable, predefined assemblies of AuNPs, termed gold soret colloids (AuSCs) to comprehend their efficacy toward dequenching. In this report, we present the synergistic combination of metal-AuSC and dielectric-HRI Nd2O3 NRs to realize >1500-fold emission enhancements using the PCCE platform (vis-à-vis >360-fold in SPCE). Dispersion relation [3, 4, 13], given by equation (1), needs to be satisfied: kSPP
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