UV-resonant magnetoplasmonic properties of chemically synthesized indium nanoparticles

Abstract

In this article, magneto-optical (MO) properties of metallic indium (In0) nanoparticles, as one of the promising non-noble metals for UV plasmonics, are investigated using magnetic circular dichroism (MCD) spectroscopy. In0...

Magnetoplasmonic Properties of Oxygen-Deficient Blue TiO2 Nanodots with High Water Dispersibility for Vis-NIR Light-Harvesting Applications

“…Fortunately, some recent studies on blue Nb-doped TiO 2 nanodots demonstrated a broad LSPR peak at 2500–3500 nm (or 4000–2857 cm –1 ), ,, so we here assume that the LSPR band has a Gaussian profile with E LSPR = 3333 cm –1 (= 3000 nm). We then simulated the MCD signature using a deconvoluted Gaussian profile as input (see the tail component 1 in Figure a), applied a simple blue/red-shift approximation, with one shifted to higher energy (+ℏω c /2) and the other shifted to lower energy (−ℏω c /2), and took the difference between them in accordance with the shape and intensity. ,, In simulating the spectra, additionally, dichroism (Δ A = (MCD/33) in degree unit) is normalized by both A max (absorbance at the LSPR maximum) and B (in tesla). A max could be obtained by the simultaneous simulation.…”

“…The cyclotron or shift frequency ω c is a function of the effective mass of electron (= m *) and expressed as eB / m *, where e denotes the electron charge; that is, ω 0 ± ω c /2 = ω 0 ± eB /(2 m *) . Therefore, the value of m * in the Nb-doped blue TiO 2 ( Nb-TD 120–4 ) can be estimated by deconvolution of the optical absorption and simultaneous MCD simulation based on the successful fitting of both spectra. , …”

“…37 Therefore, the value of m* in the Nb-doped blue TiO 2 (Nb-TD 120−4 ) can be estimated by deconvolution of the optical absorption and simultaneous MCD simulation based on the successful fitting of both spectra. 37,57 In the present blue TiO 2 nanodot sample, the energy of the LSPR maximum (= E LSP ) was beyond the detection limit of our instrumentation, but E LSP is needed to successfully simulate the MCD spectrum. Fortunately, some recent studies on blue Nb-doped TiO 2 nanodots demonstrated a broad LSPR peak at 2500−3500 nm (or 4000−2857 cm −1 ), 18,21,58 so we here assume that the LSPR band has a Gaussian profile with E LSPR = 3333 cm −1 (= 3000 nm).…”