本文選題：金屬納米顆粒 + 表面等離激元共振��； 參考：《太陽能學(xué)報(bào)》2017年03期

【摘要】：采用基于有限元的數(shù)值模擬方法,建立微晶硅襯底上單個(gè)金屬納米顆粒與光相互作用的三維(3D)模型,分別計(jì)算不同半徑的Ag、Al、Au和Cu球狀納米顆粒的散射截面、吸收截面、散射效率及耦合效率。結(jié)果表明:隨著金屬納米球半徑R的增大,表面等離激元偶極共振峰發(fā)生紅移且展寬,同時(shí)顆粒的歸一化吸收截面快速下降;在中長(zhǎng)波段(500~1100 nm),顆粒的散射效率隨R的增大而增大,但耦合效率則呈現(xiàn)單調(diào)下降趨勢(shì)。在相同尺寸的Ag、Al、Au和Cu顆粒中,Au和Cu的吸收截面較大,當(dāng)R=50 nm時(shí),Au和Cu顆粒的吸收截面甚至大于其散射截面,二者在中短波段(300~550 nm)的散射效率明顯偏低。另外,金屬納米顆粒的耦合效率對(duì)顆粒成分變化不敏感。
[Abstract]:A three-dimensional (3D) model of the interaction between single metal nanoparticles and light on microcrystalline silicon substrates was established by using finite element method. The scattering cross sections and absorption sections of AgPe Alan au and Cu spherical nanoparticles with different radii were calculated, respectively. Scattering efficiency and coupling efficiency. The results show that with the increase of the radius R of the metal nanoparticles, the resonance peak of the surface isobaric dipole is red-shifted and widened, and the normalized absorption cross section of the particles decreases rapidly. The scattering efficiency of the particles increases with the increase of R, but the coupling efficiency decreases monotonously at the medium and long wavelength band of 500 ~ 1100 nm ~ (-1). The absorption cross sections of au and Cu are larger in the same size of Agar Aln au and Cu particles, and the absorption cross sections of au and Cu particles are even larger than their scattering cross sections at 50 nm, and the scattering efficiency of the two particles is obviously lower in the medium and short band (300 ~ 550 nm). In addition, the coupling efficiency of metal nanoparticles is insensitive to the change of particle composition.
【作者單位】： 鄭州大學(xué)物理工程學(xué)院材料物理教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展(973)計(jì)劃(2011CB201606) 國家自然科學(xué)基金(11204276)
【分類號(hào)】：TB383.1;TM914.4

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本文編號(hào)：1976394