Plasmon-enhanced optical bending and heating on V-shaped deformation of gold nanorod

Liaw, Jiunn-Woei; Huang, Chen-Han; Huang, Mao-Chang; Kuo, Mao‐Kuen

doi:10.1007/s00339-017-1433-0

Cited by 3 publications

(5 citation statements)

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“…Liaw et al 39 have reported that optical forces do not act isotropically on a nanorod. The relation between the electromagnetic field and mechanical forces can be expressed by the Maxwell stress tensor.…”

mentioning

confidence: 99%

Single-Step Plasmonic Dimer Printing by Gold Nanorod Splitting with Light

Schuknecht,

Maier,

Vosshage

et al. 2023

Nano Lett.

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Optical printing is a flexible strategy to precisely pattern plasmonic nanoparticles for the realization of nanophotonic devices. However, the generation of strongly coupled plasmonic dimers by sequential particle printing can be a challenge. Here, we report an approach to generate and pattern dimer nanoantennas in a single step by optical splitting of individual gold nanorods with laser light. We show that the two particles that constitute the dimer can be separated by sub-nanometer distances. The nanorod splitting process is explained by a combination of plasmonic heating, surface tension, optical forces, and inhomogeneous hydrodynamic pressure introduced by a focused laser beam. This realization of optical dimer formation and printing from a single nanorod provides a means for dimer patterning with high accuracy for nanophotonic applications.

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confidence: 99%

Single-Step Plasmonic Dimer Printing by Gold Nanorod Splitting with Light

Schuknecht,

Maier,

Vosshage

et al. 2023

Nano Lett.

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“…The fluence of laser beam is 25 MW/cm 2 . The multiple multipole (MMP) method is utilized to analyze the induced electromagnetic field [ 7 , 30 , 31 , 32 ]. The optical traction on the surface of the NP/NR is defined as the inner product of Maxwell’s stress on the surface with the normal vector,

.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, other research showed that optical stress can be used to bend a suspending gold nanorod (NR) in water by means of an LP laser beam of 1064 nm [6]. The mechanism of V-shaped deformation of an NR was theoretically explained in [7]; photothermal heating softens gold NR, and optical stress (Maxwell's stress on surface) induces an optical bending on the NR by a LP Gaussian beam. In contrast, most previous experiments showed that a gold NR can be heated to become a spherical NP by irradiation of CW or pulsed lasers [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we aim to study optomechanical deformation caused by Maxwell's stress provided by an LP light upon the surface of a photothermal-softened gold NP/NR. The multiple multipole (MMP) method is utilized to simulate the electromagnetic field of a gold NP/NR irradiated by an LP Gaussian beam, and then to calculate the optical traction (Maxwell's stress on surface) distribution on the surface of the NP/NR [7,[30][31][32]. Next, an elastic model is used to numerically simulate the deformation according to the optical traction distribution, and a viscoelastic model is applied to theoretically estimate the following creep (elongation) as temperature nears the melting point [33,34].…”

Section: Introductionmentioning

confidence: 99%

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Plasmon-Enhanced Photothermal and Optomechanical Deformations of a Gold Nanoparticle

Liaw

Liu

et al. 2020

Nanomaterials

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Plasmon-enhanced photothermal and optomechanical effects on deforming and reshaping a gold nanoparticle (NP) are studied theoretically. A previous paper (Wang and Ding, ACS Nano 13, 32–37, 2019) has shown that a spherical gold nanoparticle (NP) irradiated by a tightly focused laser beam can be deformed into an elongated nanorod (NR) and even chopped in half (a dimer). The mechanism is supposed to be caused by photothermal heating for softening NP associated with optical traction for follow-up deformation. In this paper, our study focuses on deformation induced by Maxwell’s stress provided by a linearly polarized Gaussian beam upon the surface of a thermal-softened NP/NR. We use an elastic model to numerically calculate deformation according to optical traction and a viscoelastic model to theoretically estimate the following creep (elongation) as temperature nears the melting point. Our results indicate that a stretching traction at the two ends of the NP/NR causes elongation and a pinching traction at the middle causes a dent. Hence, a bigger NP can be elongated and then cut into two pieces (a dimer) at the dent due to the optomechanical effect. As the continuous heating process induces premelting of NPs, a quasi-liquid layer is formed first and then an outer liquid layer is induced due to reduction of surface energy, which was predicted by previous works of molecular dynamics simulation. Subsequently, we use the Young–Laplace model to investigate the surface tension effect on the following deformation. This study may provide an insight into utilizing the photothermal effect associated with optomechanical manipulation to tailor gold nanostructures.

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“…Finite difference time domain (FDTD) modelling is employed to demonstrate that the multiwavelength plasmonic switches proposed in this paper are capable of achieving an ER >12 dB at two wavelengths in the optical communication window, and these two wavelengths can be controlled by varying the geometrical parameters of the proposed switches as discussed in the later sections. Moreover, according to the previous studies on the plasmonic properties of V-shaped plasmonic nanostructures [75][76][77][78], it is well known that there is a linear relationship between the plasmon resonance wavelength and the arm length of the VNS. In this paper, we exploit this linear dependence by proposing periodic arrays of unit cells of VNSs such that each unit cell has VNSs of variable arm lengths-with VNS of each specific arm length leading to its own specific plasmon resonance wavelength.…”

Section: Introductionmentioning

confidence: 97%

Multi-wavelength and broadband plasmonic switching with V-shaped plasmonic nanostructures on a VO₂ coated plasmonic substrate

Dalal,

Sharma

2024

Nanotechnology

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In this paper, periodic arrays of identical V-shaped gold nanostructures and variable V-shaped gold nanostructures are designed on top of a gold-coated silicon dioxide (SiO2) substrate with a thin spacer layer of vanadium dioxide (VO2) to realize multi-wavelength and broadband plasmonic switches, respectively. The periodic array of identical V-shaped nanostructures (IVNSs) with small inter-particle separation leads to coupled interactions of the elementary plasmons of a V-shaped nanostructure (VNS), resulting in a hybridized plasmon response with two longitudinal plasmonic modes in the reflectance spectra of the proposed switches when the incident light is polarized in the x-direction. The x-direction is oriented along the axis that joins the V-junctions of all VNSs in one unit cell of the periodic array. On exposure to temperature, electric field, or optical stimulus, the VO2 layer transforms from its monoclinic semiconducting state to its rutile metallic state, leading to an overall change in the reflectance spectra obtained from the proposed nanostructures and resulting in an efficient multi-wavelength switching action. Finite difference time domain (FDTD) modelling is employed to demonstrate that an extinction ratio > 12 dB at two wavelengths can be achieved by employing the proposed switches by employing periodic arrays of identical V-shaped nanostructures. Further, plasmonic switches based on variable V-shaped nanostructures (VVNSs) — i.e., multiple VNSs with variable arm lengths in one unit cell of a periodic array — are proposed for broadband switching. In the broadband operation mode, we report an extinction ratio > 5 dB over an operational wavelength range > 1400 nm in the near-IR spectral range spanning over all optical communication bands, i.e., the O, E, S, C, L and U bands. Further, it is also demonstrated that the wavelength of operation for these switches can be tuned by varying the geometrical parameters of the proposed switches. These switches have the potential to be employed in communication networks where ultrasmall and ultrafast switches with multi-wavelength operation or switching over a wide operational bandwidth are inevitably required.

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Plasmon-enhanced optical bending and heating on V-shaped deformation of gold nanorod

Cited by 3 publications

References 20 publications

Single-Step Plasmonic Dimer Printing by Gold Nanorod Splitting with Light

Single-Step Plasmonic Dimer Printing by Gold Nanorod Splitting with Light

Plasmon-Enhanced Photothermal and Optomechanical Deformations of a Gold Nanoparticle

Multi-wavelength and broadband plasmonic switching with V-shaped plasmonic nanostructures on a VO₂ coated plasmonic substrate

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Plasmon-enhanced optical bending and heating on V-shaped deformation of gold nanorod

Cited by 3 publications

References 20 publications

Single-Step Plasmonic Dimer Printing by Gold Nanorod Splitting with Light

Single-Step Plasmonic Dimer Printing by Gold Nanorod Splitting with Light

Plasmon-Enhanced Photothermal and Optomechanical Deformations of a Gold Nanoparticle

Multi-wavelength and broadband plasmonic switching with V-shaped plasmonic nanostructures on a VO2 coated plasmonic substrate

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Product

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Multi-wavelength and broadband plasmonic switching with V-shaped plasmonic nanostructures on a VO₂ coated plasmonic substrate