Highly Conductive Nanograting–Nanohole Structures with Tunable and Dual-Band Spectral Transparency

Abstract

Simultaneously increasing electric conductance and optical transmission represents a key challenge for developing a high-quality transparent metallic film (TMF). Using nanosphere lithography and oblique angle deposition, we show that large-area silver nanograting (NG) on nanohole (NH) structures can meet this challenge. The fabricated NG–NH hybrid structure exhibits an excellent sheet resistance as low as 4.53 Ω/sq, an optical transmission of 75.4% from visible to near-infrared, and a high Haacke number up to 13.1, which is superior to that of previously reported metal NH networks or TMFs. Both the electric conductance and optical transparency are anisotropic and can be tuned by the NH diameter, lattice spacing, and the polarization of incident light. In particular, the transparency wavelength bands for different polarized lights are significantly different, which can be used for dual functionalities. The anisotropic electronic property is explained by a two-dimensional resistor network model, and the observed optical responses match well with the results from finite-difference time-domain calculations.

Structure and Optical Property Prediction of 2D Plasmonic Photonic Crystals Fabricated by Shadow Sphere Lithography

“…The small Fano-like dips at λ D2 and λ D3 are due to the destructive interference of the higher order resonances of NGonNH (octupolar mode and hexapole mode for D 2 and D 3 ) with the overlapping EOT peak . The detailed physical explanation of the peak and dips can be found in ref . The FDTD calculated T (λ,ϕ) based on the structures predicted by NC (Figure f) shows an overall similar trend with the change of ϕ; that is, T ( λ , 0 ° ) has a broad absorption peak, and when ϕ increases, in the 700–1140 nm wavelength range, the transmission decreases, and only two sharp dips at λ D1 = 946 and λ D2 = 1108 nm begin to evolve, while the transmission in the 1200–2500 nm range increases with a large decreasing slope compared to those in Figure e.…”

“…The optical properties were characterized using an ultraviolet–visible spectrophotometer (Perkin Elmer Lambda 35). The polarization-dependent spectra were achieved by adding a matched set of polarizers to the above spectrometer via a home-built mounting and alignment system. , …”

Coupling between Surface Plasmon Modes of Single-Layer Complex Silver Nanohole Arrays and Enhancing Index Sensing

“…The nanorods can also be replaced by other nanostructures capable of supporting LSPR, such as nanoparticles and nanodisks, while the nanoholes can be round or oval. It has also been shown that the preparation of large-scale complex hole structures, i.e., hole rod, 17,18 hole disk, 28,29 hole particle, 30 and hole grating, 31…”

“…The nanorods can also be replaced by other nanostructures capable of supporting LSPR, such as nanoparticles and nanodisks, while the nanoholes can be round or oval. It has also been shown that the preparation of large-scale complex hole structures, i.e., hole rod, , hole disk, , hole particle, and hole grating, can be achieved through simple processes by combing NSL and glancing angle deposition. The possible NRinNH structures by NSL are shown in Figure S11 in the SI.…”

Recent Advances in Silver Nanostructured Substrates for Plasmonic Sensors

“…Ingram et al demonstrated Ag–Cu mixed phase nanopatterns at different compositions of metals, combining shadow nanosphere lithography and glancing angle co-deposition ( Figure 6 d) [ 77 ]. Combining NSL with oblique angle deposition, they designed a transparent metallic nanohole array over a large surface area with improved electrical properties [ 78 ]. A thick layer of Ag (>100 nm) was made transparent with a periodic array of hollow nanocones using NSL.…”