Light absorption and scattering of 40–170 nm gold nanoparticles on glass substrates

Abstract

The localized surface plasmon resonance (LSPR) effect in metal nanoparticles is important for many applications ranging from detectors and sensors to photovoltaic devices. The LSPR wavelength is sensitive to the shape, size, surface condition, and surrounding environment. Therefore, it is important to compare the optical properties of metal nanoparticles of nominally similar dimensions and external conditions, but fabricated with different techniques. Here, a systematic study of the optical properties of large, periodic arrays (3 Â 3 mm) of cylindrical, gold nanoparticles with diameters ranging from 39 6 4 nm to 167 6 5 nm and a height of 25 6 1 nm is presented. The large arrays allow us to investigate the optical properties using an integrating sphere setup collecting the light scattered and absorbed by the nanoparticles. To the best of our knowledge, such a setup has not been used previously for electron beam lithography (EBL) fabricated samples mainly due the large sample area required. The authors compare our results with relevant literature and find a good agreement, which confirms the expected reproducibility of EBL. Further, the authors compare our absorption and scattering measurements with previous absorption and scattering measurements on large arrays of gold nanoparticles prepared on glass using hole-mask colloidal lithography. Finally, a comparison with simulations using a finite difference time domain software package (Lumerical, Inc.) is presented. The simulation results matches well with experimental results and are also supporting and detailing our comparison with published literature. The authors find a good agreement between the two fabrication methods. The small deviations found can be contributed to differences in the particle size and density distributions. Published by the AVS. https://doi.

Solid-State Dewetting of Gold on Stochastically Periodic SiO2 Nanocolumns Prepared by Oblique Angle Deposition

“…Figure and Table , note that nanoparticles, relatively abundant in sample Au/SiO 2 -70rot­(SSD), may also contribute to the SPR band at ca. 520 nm and that the shape and a distinct interaction with the substrate may also contribute to the observed differences). − In this regard, it is noteworthy that in sample Au/SiO 2 -70­(SSD), the well-defined maximum at 520 nm is accompanied by a well-defined shoulder at around 650–700 nm (see the inset in Figure c), which must stem from the bigger and irregular Au particles formed in this case and possible interactions between them (see Figure and Table ).…”

A Super‐Boosted Hybrid Plasmonic Upconversion Process for Photodetection at 1550 nm Wavelength

“…[ 46 ] It is well known that 150 nm Au NPs used on an Au NA have a high scattering cross section of single particles with a diameter of 150 nm. [ 47,48 ] Therefore, the Au NA is expected to exhibit a high R owing to the high scattering of 150 nm Au NPs. To obtain improved Abs, we decorated 15 nm Au NPs with a low scattering efficiency to enhance the Abs and reduce the R .…”

“…To obtain improved Abs, we decorated 15 nm Au NPs with a low scattering efficiency to enhance the Abs and reduce the R . [ 47,48 ] This implies that the decoration of 15 nm Au NPs increases the NIR absorption because plasmonic coupling occurs via the formation of a narrow nanogap (≈1.4 nm) between small (15 nm) and large (150 nm) particles. [ 30,49,50 ] Furthermore, Figure 2D indicates that the Abs of the Au CSNA was 2.96 times higher than that of the Au NA at 1550 nm.…”