Self‐Assembled Plasmonic Nanoring Cavity Arrays for SERS and LSPR Biosensing

Abstract

Self-assembled plasmonic nanoring cavity arrays are formed alongside the curvature of highly packed metallic nanosphere gratings. The sub-10-nm gap size is precisely tuned via atomic layer deposition and highly ordered arrays are produced over a cm-sized area. The resulting hybrid nanostructure boosts coupling efficiency of light into plasmons, and shows an improved SERS detection limit. These substrates are used for SERS detection of the biological analyte, adenine, followed by concurrent localized surface plasmon resonance sensing.

Handheld high-throughput plasmonic biosensor using computational on-chip imaging

“…[91][92][93][94] Nanoscale plasmonic structures consisting of metallic particles and/or apertures provide new avenues for biosensing and spectroscopy due to their ability to generate dramatic field enhancements and spatially confine light on the nanometer scale. [95][96][97][98][99][100][101][102][103] In particular, nanoaperture arrays support extraordinary optical transmission through the exploitation of plasmonic modes excited by the grating orders of the array. 104,105 These plasmonic modes are highly sensitive to minute changes in the near-field refractive index of the nanoaperture.…”

Recent advances in plasmonic nanostructures for sensing: a review

“…6). 57,[77][78][79][80] Such multilayer geometries have been employed on silver island films 77 and MeFON surfaces, 57,78,79,83 demonstrating the versatility of this enhancement mechanism. In particular, by applying (10) Strobbia, Languirand, and Cullum: Recent advances in plasmonic nanostructures for sensing: a review (10) Strobbia, Languirand, and Cullum: Recent advances in plasmonic nanostructures for sensing: a review this multilayer geometry to MeFON substrates, it is possible to further enhance the original SERS signal of these substrates by over two orders of magnitude.…”

“…These mixed material substrates include (i) dielectric materials coated with metals, [62][63][64]70 (ii) metals coated with dielectrics, 53,[71][72][73][74] (iii) semiconductors coated with metals, 75,76 and (iv) multilayered metal structures separated by dielectrics. 57,[77][78][79][80] One of the earliest and most prominent classes of these mixed material nanostructures for SERS sensing is known as core-shell nanoparticles, which consist of a dielectric core structure coated with a metallic shell [see Fig. 5(a)].…”

Optical Response of Plasmonic Nanohole Arrays: Comparison of Square and Hexagonal Lattices

“…The ability of light confinement below the diffraction limit with large near-field intensity enhancements through excitation of surface plasmons [1][2][3] has enabled various applications in biodetection field, i.e., surface-enhanced vibrational spectroscopy [4][5][6][7][8][9][10] and label-free biosensing [11][12][13][14][15]. Surface plasmons, propagating at metal surfaces, can be utilized, e.g., in ultra-compact electro-optic modulators [16].…”