Localized Plasmons in Noble Metal Nanospheroids

Kooij, Ernst S.; Ahmed, Waqqar; Zandvliet, Henricus J.W.; Poelsema, Bene

doi:10.1021/jp112085s

Cited by 55 publications

(57 citation statements)

References 57 publications

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“…Similar phenomenon was also reported in Ag and Au NPs . Although numerical simulation can reproduce the blueshift phenomenon, it is unable to reveal the underlying physics. The blueshift effect can be explained by “LC circuit model.” If a nanoparticle is made of plasmonic material and its size is much smaller than the wavelength of incident light, it effectively behaves as a “nanoinductor” due to the negative real part of the permittivity inside the particle .…”

Section: Resultssupporting

confidence: 71%

Tailoring Plasmon Resonances in Aluminium Nanoparticle Arrays Fabricated Using Anodic Aluminium Oxide

Zhao

Zhu

et al. 2014

Advanced Optical Materials

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biomolecules that have small Raman cross sections in the visible and NIR regions. [ 2 ] However, interband transitions introduce a dissipative channel for Au and Ag plasmon resonances at wavelengths shorter than 550 and 350 nm, respectively. aluminium (Al) has recently been suggested as promising plasmonic material in the UV and DUV regions because it has negative real part of dielectric function down to a wavelength of ≈100 nm. [ 3 ] The sharpness and intensity of LSPR of small Al NPs improve with increasing energy. The excellent optical properties of Al make it an excellent material for UV nanoantennas, [ 4 ] DUV SERS, [ 2,5 ] lightemission enhancement of wide-bandgap semiconductors, [ 6 ] and improvement of light harvesting in solar cells. [ 7 ] Moreover, Al is signifi cantly cheaper than most other metals, and could potentially serve as the metal of choice for either complementary metal-oxide-semiconductor (CMOS) compatible or mass-producible plasmonic applications.Controllability of LSPR energies is highly required for plasmonic applications. For instance, DUV-SERS of adenine on Al nanostructures requires their resonance peaks close to the excitation wavelength to ensure high-electromagnetic nearfi eld enhancement. [ 2,5 ] LSP-enhanced DUV light-emission in AlGaN multiple quantum wells desires large spectral overlap between the plasmon resonance of Al NPs and the bandgap of active layer. [ 8 ] Al NPs are generally designed with the help of electron beam lithography (EBL) and focused ion beam (FIB) lithography in order to obtain well-controlled structures. [ 4 , 7b , 9 ] However, these approaches involve a slow process and are not cost effective, so that they are not practical for large area (square cm) fabrication. Although Al NPs can be fabricated by modifi ed methods of annealing thin Al fi lm, [ 10 ] such techniques often lead to signifi cant size dispersion, and it is diffi cult to tune the size and interval of particles independently. Anodic Al oxide (AAO), which is prepared by the anodic oxidation of Al in an acidic electrolyte, is one of the typical self-organized fi ne structures with a nanohole array. Using AAO as an evaporation or electrodeposition mask, ordered NP arrays can be formed. [ 11 ] This process has several advantages: each particle has almost identical size and spacing, the size and the spacing can be easily controlled by changing the geometrical structure of the AAO mask, there is no practical limitation to the size of the AAO template, so that very large panels of NPs can be made with low cost. However, to the best of our knowledge, the study

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Section: Resultssupporting

confidence: 71%

Tailoring Plasmon Resonances in Aluminium Nanoparticle Arrays Fabricated Using Anodic Aluminium Oxide

Zhao

Zhu

et al. 2014

Advanced Optical Materials

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“…For Al nanospheres, the dipole (m = 1) resonance dominants for size 20 nm, the quadrupole (m = 2) resonance mode appears for size !30 nm, and octupole (m = 3) resonance mode for size !80 nm. In comparison, the Au nanosphere exhibits multipolar peaks at much larger size (!140 nm) [21]. Figure 3(b) shows the calculated wavelength shift (Δλ p ) with nanosphere size.…”

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confidence: 99%

Size- and shape-dependent plasmonic properties of aluminum nanoparticles for nanosensing applications

Katyal

Soni

2013

Journal of Modern Optics

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The localized surface plasmon resonance (LSPR) of aluminum nanospheres, nanorods, and nanodisks was studied using the finite-difference time-domain (FDTD) method. From the simulation results, optimal dimensions of nanospheres, nanodisks, and nanorods for refractive index sensitivity (RIS), line shape broadening (FWHM), and figure-of-merit (FOM) are calculated for aluminum-based plasmonic nanosensors. Our calculated results show that aluminum is an efficient plasmonic material for refractive index sensing from deep-UV to near infrared wavelengths. The RIS of aluminum nanospheres of optimal size is greater than gold and silver nanospheres. Further, RIS or FOM can be optimized in different spectral region by varying shape and dimensions. The optimization reveals higher FOM for nanospheres in the deep-UV region and for nanorods and nanodisks in the broad visible-NIR region.

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“…Unfortunately, there is no exact analytical formula for the influence of retardation on the quasi-static dipolar resonance wavelength and its dependence on the relevant axis length. However, simulations and experiments revealed that the dependence of the dipolar resonance on axis length shows the characteristics of a second-order polynomial [13,16,40]. This means that the study of a restricted range of axis lengths far from the quasi-static limit results in quasi-linear scaling as experimentally observed.…”

Section: Discussionmentioning

confidence: 88%

Axis-selective excitation of gold nanoparticle resonances

2014

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Designing the optical response of metallic nanoparticles (NPs) is crucial for applications based on localized surface plasmons. In order to gain insight into the optical properties of metallic NPs and their experimental control, a well-defined, highly flexible excitation of single NPs is needed. In this study, we report on the realization of a measurement setup that allows 3D axis-selective excitation of single NPs with high accuracy, facilitating the study of the resulting scattering cross sections in the visible wavelength range. The experimental setup combines the concepts of dark-field optical microscopy and spectroscopy and objective-type total internal reflection fluorescence microscopy. Its functionality is validated by the study of nanocylinders with elliptical footprints. A retardation-influenced size range of moderate aspect ratios is addressed by choosing axis lengths between 70 and 200 nm. We experimentally separate three different polarization states of dipolar character, one for an electric field along each of the three principal axes, and show that the overall scattering spectrum of such a nanocylinder follows the expected superposition principle. Based on this separation, the scaling of the three resonances with the length of the principal axes is analyzed. It is found that each resonance scales exclusively with the corresponding principal axis in a linear way with slopes of the order of 1 to 2. Reasons for this scaling behavior and for its limited validity are discussed in terms of particle depolarization in the quasi-static limit and retardation.

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Localized Plasmons in Noble Metal Nanospheroids

Cited by 55 publications

References 57 publications

Tailoring Plasmon Resonances in Aluminium Nanoparticle Arrays Fabricated Using Anodic Aluminium Oxide

Tailoring Plasmon Resonances in Aluminium Nanoparticle Arrays Fabricated Using Anodic Aluminium Oxide

Size- and shape-dependent plasmonic properties of aluminum nanoparticles for nanosensing applications

Axis-selective excitation of gold nanoparticle resonances

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