Overcoming metal-induced fluorescence quenching on plasmo-photonic metasurfaces coated by a self-assembled monolayer

Abstract

We have experimentally shown significant suppression of metal-induced fluorescence (FL) quenching on plasmo-photonic metasurfaces by incorporating a self-assembled monolayer (SAM) of sub-nm thickness. The FL signals of rhodamine dye molecules have been several-ten-fold enhanced by introducing the SAM, in comparison with the previous configuration contacting molecules and metal surfaces.

Substrate effects on photophysical properties of fluorescent self-assembled monolayers (SAMs)

“…Two classic examples of these strategies are discussed here. Choi et al . reported the construction of SAMs from three different carboxylic acid group‐terminated alkane thiol derivatives, viz.…”

“…A) was used as the fluorescent molecule to test the effect of SAMs and its sub‐nanometer thickness adjusted by the length of the spacer chain length on the fluorescence. The metal‐induced (gold in this case) fluorescence quenching on plasmo‐photonic metasurfaces was considerably reduced with increase in chain length of the derivatives used for the formation of SAMs . Lin et al .…”

“…For this purpose, certain barriers must be created between the fluorophore and the substrate surface. Two main strategies are followed to create such barriers; these are (i) increasing distance between fluorophore and the substrate and (ii) creation of layer of thickness in nanometers of silicon oxide (SiO 2 ) on the two‐dimensional (chip) or three‐dimensional (nanoparticle) metallic surface . These two strategies are illustrated in Fig.…”

Optical-signal-enhancing metasurface platforms for fluorescent molecules at water-transparent near-infrared wavelengths

“…20,21 The PlasPh metasurfaces have been found to be highly suitable for enhanced spectroscopy of uorescent molecules around the visible range. [20][21][22][23] For other metallic nanostructures, it is usually quite demanding to ensure tunability of the operating wavelength and, at the same time, capability for high-efficient enhancement. In this respect, photonic-crystal-based platforms 24 are different, because they allow to scale the operating wavelengths, though photonic crystals tend to show weaker enhancement than plasmonic platforms.…”

Perfect Light Absorbers Made of Tungsten-Ceramic Membranes

“…Perfect light absorption is related to perfect emittance by reciprocity [10]; therefore, when thermal emitters were produced, researchers tried to attain perfect-absorption structures [2][3][4][5][6]. Recently, nearly perfect absorption was observed in stacked complementary structures [11], which show significant enhancement of electric-dipole emission loaded on the outmost surfaces [12][13][14]. In addition, it was lately reported that high-emittance plasmonic cavities substantially enhance both electric-and magnetic-dipole emissions of Er ions [15].…”