Higher Order Plasmonic Modes Excited in Ag Triangular Nanoplates by an Electron Beam

Keast, V. J.; Walhout, C.J.; Pedersen, Therese; Shahcheraghi, Nikta; Cortie, Michael B.; Mitchell, David R. G.

doi:10.1007/s11468-015-0145-6

Cited by 25 publications

(25 citation statements)

References 43 publications

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Section: Resultsmentioning

confidence: 99%

“…The maps present first, second, and third order edge modes at 236, 418, and 509 meV, respectively, and a first order cavity mode at 554 meV. [42,43] Additionally, a BP excitation is identified at 770 meV, slightly shifted from E c of the annealed film due to a nonzero contribution of the imaginary dielectric function component (Im{ε(E c )}) to the loss probability. [44] Sample T2 was probed with the Themis microscope and an improvement in energy resolution by ≈33 meV when compared to the Titan, revealing higher order edge and cavity modes, the ITO BP, and a low energy SiN excitation (Figure 6c), in addition to the first and second order edge modes observed previously.…”

Section: Higher-energy Resolution Datamentioning

confidence: 92%

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Tunable Infrared Plasmon Response of Lithographic Sn‐doped Indium Oxide Nanostructures

Kapetanovic

Bicket

Lazar

et al. 2020

Advanced Optical Materials

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Transparent conductive oxides (TCOs) have strong potential for plasmonic applications. Given their easily tunable properties and low energy response, significant challenges in the controlled fabrication and precise characterization of TCOs must be better understood before this potential can be realized. Here, the mid‐ to near‐infrared plasmonic response of Sn‐doped In2O3 (ITO) nanostructures is presented, fabricated top‐down using electron beam lithography and radio‐frequency sputtering. These equilateral ITO triangles of different side lengths are imaged at high spatial and energy resolution with monochromated electron energy loss spectroscopy (EELS) in a scanning transmission electron microscope. Applying the Richardson–Lucy (RL) deconvolution algorithm to experimental EELS spectra reveals localized surface plasmon (LSP) excitations between 150 and 550 meV and a 730 meV bulk plasmon. This very‐low‐energy response to an electron beam is compared with boundary element method simulations of nanostructures. These simulations use the dielectric functions of continuous thin films of the same materials, characterized by ellipsometry, 4‐point probe, and Hall effect tests. Additionally, upon rapid thermal annealing of ITO, blue‐shifts in LSP energy, and longer LSP lifetimes are examined as a consequence of an amorphous‐to‐polycrystalline transformation and an increase in the free carrier density.

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Section: Resultsmentioning

confidence: 99%

Section: Higher-energy Resolution Datamentioning

confidence: 92%

Tunable Infrared Plasmon Response of Lithographic Sn‐doped Indium Oxide Nanostructures

Kapetanovic

Bicket

Lazar

et al. 2020

Advanced Optical Materials

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“…A large field enhancement is expected to appear at the tips. At shorter wavelengths, another absorption peak with lower amplitude can be ascribed to the quadrupole plasmon mode 14 . Compared with DDA simulation, quadrupole mode absorption from experiments gets broader and shifts to 540 nm.…”

Section: Resultsmentioning

confidence: 99%

“…The intrinsic nonlinearity of Au has already been well investigated and described by laser-induced electron distribution change 22 . While exhibiting same intrinsic nonlinearity, modification of geometries results in the different polarization of LSPR 14 . The key feature of nanoplates is the near-infrared dipole polarization and higher order plasmon modes close to interband region.…”

Section: Resultsmentioning

confidence: 99%

Spectral dependence of third-order susceptibility of Au triangular nanoplates

Zhang

Sato

Tanaka

et al. 2020

Sci Rep

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We experimentally investigated the spectral dependence of the third-order susceptibility χ (3) of Au triangular nanoplates in a broad wavelength region (400-1,000 nm). Complex shaped plasmonic nanoparticles provide a promising route to achieve control of their optical properties at the nanoscale. However, little is known about the effects of geometrical parameters to the optical nonlinearities and underlying mechanisms of the plasmon modes. Here, we obtained the χ (3) of Au triangular nanoplates featuring a narrow plasmon resonance that is tunable in the visible and near-IR regions. This work demonstrates that the plasmonic triangular nanoplates simultaneously shows selffocusing and-defocusing, and saturable and reverse-saturable absorption properties at specific wavelength regions. Maximum amplitudes of real and imaginary components are − 6.8 × 10 −18 m 2 /V 2 at 668 nm and − 6.7 × 10 −18 m 2 /V 2 at 646 nm, respectively. Spectral dependence of the quantity χ (3) enables comparison between different shaped plasmonic NPs to boost active plasmonic applications performance. Metallic nanoparticles (NPs) have attracted extensive interests because of their unique plasmonic properties 1. The light-driven collective motion of electrons within the NP is known as localized surface plasmon resonance (LSPR) 2. This resonance can boost both linear and nonlinear optical (NLO) properties 2. Thus, a plasmonic NP can feature large optical nonlinearity while exhibiting ultrafast response 3. These unique properties have been applied to various nonlinear optical functionalities, such as surface-enhanced Raman scattering (SERS), photonic waveguides and ultrafast all-optical switching 1,3-5. Among various plasmonic NPs, Au has been one of the best and common studied materials in nonlinear photonics due to its large optical nonlinearity and chemical stability 6,7. Triangular Au nanoplates is promising for strong local field enhancement expected at their sharp tips. Also, the LSPR of triangular nanoplates can be easily tuned from visible to near-IR regions by controlling their thickness and edge length 8. Besides, Au nanoplates have been reported with a large wavelength dependence of nonlinear refraction and a tiny change of nonlinear absorption 9. These results imply that Au nanoplate is a good candidate for optical switches 9,10. However, previous studies on spherical and elongated Au NPs have shown that third-order susceptibility χ (3) exhibits a strong wavelength-dependent dispersion at LSPR region 11,12. Real and imaginary components of χ (3) consist of successively positive and negative peaks. This result indicate that Au simultaneously exhibit nonlinear absorption (saturable absorption SA and reversed saturable absorption RSA) and refraction (self-focusing and self-defocusing) at different wavelengths. To clarify and understand the reported abnormal optical nonlinearity on Au nanoplates, a spectral dependent dispersion of χ (3) is necessary. To the best of our knowledge, previously reported investigations on Au nanoplates were p...

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“…As for mode B , it’s not easy to be identified due to the wide spread and weak signal of experimental EELS spectra. Keast 51 et al . reported that higher order LSP mode (mode D ) can be excited via experimental EELS.…”

Section: Resultsmentioning

confidence: 99%

Coupling of Surface Plasmon Modes and Refractive Index Sensitivity of Hollow Silver Nanoprism

Zhang

et al. 2018

Sci Rep

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Localized surface plasmon (LSP) modes depend strongly on the morphology of nanoparticle and the surrounding dielectric medium. The hollow nanostructure provides a new way to modulate the surface plasmon modes due to the additional cavity surface. In this work, we study systematically the multipolar surface plasmon modes of hollow silver nanoprism (HSN) by simulation of electron energy loss spectroscopy (EELS) spectra based on the boundary element method (BEM). Herein the effects of the cavity size and position are taken into account. The LSP modes of HSNs are compared with those of perfect silver nanoprism (SN). The red-shift behaviors of multipolar modes can be found as increasing the cavity size. Modes A and C have similar red-shift tendency and obey the plasmon ruler equation, which can be explained by dipole-dipole coupling mode. Meanwhile, the degenerate modes will be split by changing the cavity position, and opposite shift tendencies of split degenerate states are observed. These are caused by different coupling nature of degenerate modes. Moreover, high refractive index sensitivity (RIS) can be obtained for HSN by changing the cavity size and position.

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Higher Order Plasmonic Modes Excited in Ag Triangular Nanoplates by an Electron Beam

Cited by 25 publications

References 43 publications

Tunable Infrared Plasmon Response of Lithographic Sn‐doped Indium Oxide Nanostructures

Tunable Infrared Plasmon Response of Lithographic Sn‐doped Indium Oxide Nanostructures

Spectral dependence of third-order susceptibility of Au triangular nanoplates

Coupling of Surface Plasmon Modes and Refractive Index Sensitivity of Hollow Silver Nanoprism

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