Study of plasmonics induced optical absorption enhancement of Au embedded in titanium dioxide nanohole arrays

Abstract

Abstract:The light absorbing performance of titanium dioxide (TiO 2 ) nanohole arrays partially filled with metallic gold is investigated using analytical methods. As a plasmonic generation element on one-dimensional (1D) TiO 2 , the shape and distribution of Au nanoparticles can be microfabricated controllably in 1D TiO 2 nanohole arrays rather than randomly loaded on their top surface. Results indicate that strong absorption enhancement and a large reception angle in the visible light region (λ = 700 -850 nm) are induced due to the waveguide coupling within the nanohole arrays and surface plasmonic resonance (SPR) at the interface between TiO 2 and gold fillings. By varying the thickness of TiO 2 array or gold disks and the periodicity of nanohole array, a significant difference in plasmonic resonance wavelength and light absorption enhancement can be expected. Due to the symmetric configuration of the nanohole structure, the enhancement is insensitive to the polarization of the incoming light and the same enhancement factor can be achieved for both transverse electric (TE) and transverse magnetic (TM) modes. This model offers an approach to precisely control a 1D nanomaterial based plasmonic effect and can be adapted to other materials used in microelectromechanical systems industry.

Phenomenal Insight into Electrochemically Induced Photocatalytic Degradation of Nitrobenzene on Variant Au-Modified TiO2 Nanotubes

“…This approach significantly enhanced degradation efficiency and reduced carrier recombination. However, in many studies concerning the surface modification of Au [12,13] on TiO 2 , there has been limited research on the optimal loading amount and the degradation of organic substances under a photo-electro field [14][15][16].…”

Improving the Energy Conversion Efficiency of a Laser-Driven Flyer by an In Situ-Fabricated Nano-absorption Layer

“…Recently, the use of plasmonic nanomaterials to improve the light absorption through an excitation of localized surface plasmon resonance (LSPR) has attracted considerable interest in the fields of spectroscopic sensors and solar energy conversion [11][12][13]. Aluminum nanostructures can be used as light-harvesting systems because it covers up a wide spectrum range from ultraviolet to visible light of LSPR [14][15][16][17].…”

Evolution of large area TiS2-TiO2 heterostructures and S-doped TiO2 nano-sheets on titanium foils

“…TiO 2 nanostructures show enhancement in their photocatalytic activity (PCA) compared to their bulk counterparts 12 . Moreover, the higher surface to volume ratio of nanostructures brings a broader active field to absorb the incident ultra-violet (UV) spectra and their coupling with confined structures such as gold disks 13 . Along with the superior characteristics gained through size reduction, efforts have been made towards the growth of crystalline structures along with the desired facets due to the unique characteristics of special crystalline planes of TiO 2 14 .…”