Effects of different structural parameters and the medium environment on plasmonic lattice resonance formed by Ag nanospheres on SiO2 nanopillar arrays

Highly Sensitive Plasmonic Sensor with Au Bow Tie Nanoantennas on SiO2 Nanopillar Arrays

“…As noted before, our geometry using metallic bow tie nanoantennas on silica pillar arrays has a sensitivity of 612 nm/RIU with a comparable FOM. This sensitivity is 33% higher than these previously reported values from the literature [34,43].…”

Plasmon lattice resonances induced by an all-dielectric periodic array of Si nanopillars on SiO2 nanopillars

“…This is because with increasing h Sio2 , the radiative loss rate of Si nanopillars into the substrate reduces [15]. Compared to the period array of Ag nanospheres on SiO 2 nanopillars [14], when h Sio2 is equal to 500 nm and the surrounding medium is air, although the transmittance of this structure at the PLR wavelength is slight bigger than that of Ag nanospheres on SiO 2 nanopillars (which indicates the PLR intensity of this array is slight weaker than that of the array of Ag nanospheres on SiO 2 nanopillars), the FWHM (5.8 nm) of the PLR of this structure is 2.6 times narrower than that (15 nm) of Ag nanospheres on SiO 2 nanopillars. Such narrow FWHM is important to improve the precision of sensors.…”

“…This is because the dielectric nanopillar arrays provide a more homogeneous dielectric environment to the metal nanoparticle array. But the FWHM of the PLR of this composite periodic array is too wide due to large absorption loss of metal material [14].…”

“…However, the radiation loss of large-size metal nanoparticles is relatively large, so the FWHM of the PLR is often wide. The composite periodic array of the metal nanoparticles on the dielectric nanopillars makes it possible to form PLR [12][13][14]. This is because the dielectric nanopillar arrays provide a more homogeneous dielectric environment to the metal nanoparticle array.…”

Chiral plasmonic nanostructure of twistedly stacked nanogaps

“…Localized surface plasmons (LSPs) [1,2] are collective charge oscillations confined within the interface between the noble metal nanoparticles and the surrounding dielectric medium, and the resonance is sensitively related with the structural geometry, material, and environment [3,4] . It has been proved that LSP nanostructures with spatial asymmetry own different coupling behaviors for polarized light of opposite handedness and exhibit artificially designed chiral responses [4][5][6][7][8] .…”