FDTD Simulations for Rhodium and Platinum Nanoparticles for UV Plasmonics

Abstract

The article describes the results of finite-difference time-domain (FDTD) mathematical modeling of electromagnetic fields distortion near the surfaces of two transition metals: rhodium (Rh) and platinum (Pt) on glass (SiO2) substrates. Results were compared with calculated optical properties of classical SERS generating metals (Au and Ag). We have performed FDTD-based theoretical calculations for UV SERS-active nanoparticles (NPs) and structures based on hemispheres of Rh and Pt and planar surfaces, consisting of single NPs with varied gaps between them. The results have been compared with gold stars, silver spheres and hexagons. The prospects of the theoretical approach for single NPs and planar surfaces modeling to evaluate optimal field amplification and light scattering parameters have been shown. The presented approach could be applied as a basis for performing the methods of controlled synthesis for LPSR tunable colloidal and planar metal-based biocompatible optical sensors for UV and deep-UV plasmonics. The difference between UV-plasmonic NPs and plasmonics in a visible range has been evaluated.

Integrating the amino-functionalized MOF-5 film with the silver nanoparticle substrate for a high SERS enhancement effect and long-term stability

“…68 The highest norm is observed in the “hot spots” region with a value of 3.72 times greater than that of the incident beam, which agrees with other studies. 40,69 Furthermore, the electric field is particularly strong in the space between the two surfaces due to the existence of an 80 nm cubic length MOF-5-NH 2 . Additionally, the magnitude of the local electric fields in the vicinity of Ag NPs/MOF-5-NH 2 is 5.59 times that of the origin, which is slightly higher than that observed in Fig.…”

“…38 For comparison, a similar set was applied to the sole Ag NPs without the presence of MOF-5-NH 2 . The total-field scattered-field source mode perfectly matched layer (PML) boundary conditions and refractive indices for MOF-5-NH 2 39 and Ag NPs 40 were selected and built up. Additionally, the chosen mesh size in the FDTD calculation domains was 1 nm 2 for every 3D plane with a minimum mesh step and an auto-shutoff value of 0.25 nm and 10 −5 , respectively.…”

“…and Ag NPs 40 were selected and built up. Additionally, the chosen mesh size in the FDTD calculation domains was 1 nm 2 for every 3D plane with a minimum mesh step and an auto-shutoff value of 0.25 nm and 10 À5 , respectively.…”

Beyond the Visible: A Review of Ultraviolet Surface-Enhanced Raman Scattering Substrate Compositions, Morphologies, and Performance

“…Additionally, there are a few reports on Al NSs [80,81] and one on Al complexes and junctions with pyridine [82]. Thus far, there have been four studies investigating the UV plasmonic behavior of metal NPs (Al, Cr, Cu, Ga, In, Mg, Pd, Pt, Rh, Ru, Ti, W) [83,84], homodimers of poor metals (Al, Ga, In, Sn, Tl, Pb, Bi) [85], and Au-In heterodimers [86]. The highest predicted EFs ranged from 10 8 -10 9 for Al NP dimers through optimizing the size, interparticle distance, and laser excitation energy, with the best EF of 10 9 predicted for 30 nm (radius) spherical Al NP dimers with a 1 nm interparticle spacing at λ ex = 215 nm using the finite element method [76].…”

Rhodium-embedded UV photodetectors based on localized surface plasmon resonance on AlN/GaN

“…26 Using theoretical simulations, Zyubin et al put forward a basis for performing methods for the controlled synthesis for obtaining colloidal and planar Rh-based biocompatible optical sensors for UV and deep-UV plasmonics. 27 Nevertheless, Rh nanoparticles are mainly prepared by chemical synthesis or thermal annealing methods. 28 However, the fabricated Rh NPs were achieved in a random distribution, inhomogeneous particle size, and poor reproducibility, which is unfavorable for in-depth LSP applications for obtaining enhanced photodetectors.…”