Plasmon nanolasing with aluminum nanoparticle arrays [Invited]

Epitaxial aluminum plasmonics covering full visible spectrum

“…Thus, we can precisely determine the film thickness, ranging from a few nanometers, 4.4 nm (∼19 monolayers [ML]), 10.8 nm (∼47 ML), and 20.0 nm (∼87 ML) to bulk-like (∼200 nm). In Figure 1C, we show the in-plane X-ray diffraction scan performed for the Al (220) and c-sapphire (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26) peaks, confirming the expected six-fold in-plane symmetry for epitaxial growth.…”

“…Following the discussion of fundamental structural and optical properties, we now turn to the demonstration of epitaxial film-based plasmonic applications, including aluminum SERS substrate [15] and plasmonic surface lattices [22,34,58]. For the SERS study (see Supplementary material for experimental setup), we use a vertically stacked molybdenum disulfide (MoS 2 )/tungsten diselenide (WSe 2 ) heterostructures on top of the aluminum SERS substrate (nanogroove grating) as a uniform twodimensional analyte to evaluate the SERS performance ( Figure 4A).…”

“…However, aluminum was not previously considered as a good candidate for alternative plasmonic material [5] before the advent of high-quality aluminum nanocrystals [10,11] and epitaxial films [9,12,13] with greatly improved material properties. During the past few years, the fast development of aluminum plasmonics has attract a great deal attention not only for the expected good performance of aluminum for UV plasmonics, such as UV surface-enhanced Raman spectroscopy (UV-SERS) [14,15], plasmonic lasers [16][17][18][19][20][21][22], and deep-UV resonances [8,23], but also for its unexpected excellent performance in the visible region, including complementary metal-oxide-semiconductor (CMOS)compatible color filters [24][25][26][27][28], photocatalysis [29], nonlinear optics [30][31][32], and SERS [15,33]. Very recently, aluminum has even been found to outperform silver in some important plasmonic applications [15,34].…”

Diffraction-induced quadrupolar lattice plasmon modes of high-quality factors for silver nanoparticle arrays

“…LSPRs 产生狭窄的等离子体集体共振 [16] ，这种共振模式被称作平行晶格表面等离 子体共振。不同的是，垂直晶格表面等离子体共振通常情况下由偶极 LSPRs 与衍 射光波耦合产生，具有偶极共振特性；而平行晶格表面等离子体共振则能由四偶 极 LSPRs 与衍射光波耦合获得，具有四偶极共振特性。因此，四偶极晶格等离子 体模式(quadrupolar lattice plasmon modes，QLPMs)比偶极晶格等离子体模式 (dipolar lattice plasmon modes，DLPMs)有更低的辐射阻尼损耗，在调控晶格共 振波长时，QLPMs 能在一个宽波段范围内保持较高的品质因子 [17] ；此外，这种 共振模式能容忍覆层与基底的折射率存在差异，因此，非常适用于纳米激光 [18] 、 传感 [19] 、发射增强 [16] 等领域。目前，金属纳米圆柱 [20] 、纳米条 [16] 、三聚体 [21] 、 纳米核壳 [19] 结构中的平行晶格等离子体共振已在非均匀环境下被研究了，然而， 在均匀环境下，这种多偶极(亚辐射)共振模式能进一步增强光与物质的相互作 用；文献 [22]…”

Effect of conjugation with organic molecules on the surface plasmon resonance of gold nanoparticles and application in optical biosensing

“…9 On the other hand, conductive particles such as noble metallic particles have attracted much consideration due to their high density of free electrons and the surface plasmon resonance (SPR). 10,11 The Lorentz-Drude model is accepted as a relatively good classical model for describing SPR in noble metallic particles and gives the complex value of electrical permittivity. 12,13 Besides, the quantum mechanics denition of free electrons conned in a spherical potential well is helpful to understand the optical properties and resonance frequencies of conductive NPs.…”