Polarization and azimuthal angle dependence of the optical second harmonic generation from Pt nanowires on the MgO(110) faceted template

Ogata, Yoichi; Tuấn, Nguyễn Anh; Takase, Saho; Mizutani, Goro

doi:10.1002/sia.3595

Cited by 10 publications

(11 citation statements)

References 8 publications

(13 reference statements)

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“…As indicated in Appendix 1, because the shape of Ag microgrooves had (quasi-) C 2 v symmetry, five independent nonlinear susceptibility elements, χ (2) XXZ , χ (2) ZXX , χ (2) ZZZ , χ (2) YYZ , and χ (2) ZYY , are permitted [2,6]. Here, the subscripts X , Y , and Z indicate the laboratory coordinates.…”

Section: Resultsmentioning

confidence: 99%

“…The χ (2) is sensitive to the symmetry of the shape [5,6]. As indicated in Appendix 1, if we assume that the Ni microcubes (system: tetragon) have C 4 v symmetry with four mirror planes, three nonlinear susceptibility elements, χ (2) ZZZ , χ (2) ZXX = χ (2) ZYY , χ (2) XZX = χ (2) YZY = χ (2) XXZ = χ (2) YYZ , should be permitted.…”

Section: Resultsmentioning

confidence: 99%

“…The other candidate is that the χ (2) YYY panel can be induced under C 4 v symmetry in a specific configuration [17], or the shape of the microcubes has broken symmetry at the air–metal interface [24]. However, the consideration of the E field of the incident light being converted from s - to p -polarization by a polarization scrambling effect [6,45] is plausible as one of the candidates.…”

Section: Resultsmentioning

confidence: 99%

“…Ogata et al [6] have discussed the general effect of the roughness of the metallic nanowire’s surfaces on the optical process upon them. Using their formalism, we consider the conversion of s -polarized light into p -polarized light due to the roughness of the nanowire structure used here.…”

Section: Resultsmentioning

confidence: 99%

“…Optical second-harmonic generation (SHG) is a coherent nonlinear optical process and its efficiency depends not only upon the electronic properties but also upon the symmetry of the geometrical structure of the medium [2,5,6]. In general, SHG does not generate in centrosymmetric bulk media [2].…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear optics on nano/micro-hierarchical structures on metals: focus on symmetric and plasmonic effects

Ogata

Guo

2017

Nano Reviews & Experiments

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In this review, the authors study their creation of nano/micro-hierarchical structures on Ag and Ni substrates by femtosecond laser treatment and their investigation of their optical second-harmonic generation (SHG) signal intensities by SHG spectroscopy. The authors obtained the nanostructure-covered microgroove and microcube structures. These hierarchical surface structures were found to modify significantly the optical nonlinearity of the metal surfaces. The macroscopic symmetry of the surface’s shapes influenced SHG, and the excitation of surface plasmons enhanced SHG. On the other hand, the nanostructures on the microstructures had an additional effect on the generated SHG. For the microcube structures, the additional SHG emission was suppressed by removing a large amount of nanostructures. Left SHG was discussed by the effect of the propagating delay.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nonlinear optics on nano/micro-hierarchical structures on metals: focus on symmetric and plasmonic effects

Ogata

Guo

2017

Nano Reviews & Experiments

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Virus‐Based Nanomotors for Cargo Delivery

et al. 2018

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Self‐propelled nanomotors based on virus structure were designed, fabricated and characterized. Capsids from plant virus were covered on one hemisphere with platinum layer to promote motion in the presence of hydrogen peroxide. The Janus viral nanomotors (JVNs) with 25–30 nm diameter from brome mosaic virus (BMV) and cowpea chlorotic mottle virus (CCMV) showed motion speeds of up to 9 μm/sec, depending of the peroxide fuel concentration in the medium. The JVNs can carry and deliver the chemo‐therapeutic drug Tamoxifen, and they are able to internalize into breast tumor cells without any functionalization. The therapeutic payload is released by a pH‐driven delivery action of the nanomotor. Here, the first proof of concept of a self‐propelled virus‐like nanoparticle is demonstrated. The attractive capabilities of nanomotors based on virus‐like nanoparticles (VLPs) pave the way to diverse biomedical applications.

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Optical second harmonic generation from Pt nanowires with boomerang-like cross-sectional shapes

Ogata¹,

Tuấn²,

Miyauchi³

et al. 2011

Journal of Applied Physics

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We have fabricated Pt nanowires with boomerang-like cross-sectional shapes on the MgO(110) faceted template and observed their optical second-harmonic generation (SHG) response. In the TEM images the Pt nanowires on the MgO substrate had macroscopic C2v symmetry, however, their structure had microscopic imperfections. In the SHG response, as a function of the sample rotation angle around the substrate normal, we found contributions from the nonlinear susceptibility elements χ113, χ223, χ311, χ322, and χ333 originating from the broken symmetry in the 3; [110] direction of the MgO substrate. The indices 1 and 2 denote the [001] and [11¯0] directions, respectively. Under C2v symmetry no SHG is expected in the s-in/s-out polarization configuration, however, a finite SHG was observed in this polarization configuration. We suggest that the SHG in the forbidden configuration might originate from the imperfections in the nanowire structure.

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Polarization and azimuthal angle dependence of the optical second harmonic generation from Pt nanowires on the MgO(110) faceted template

Cited by 10 publications

References 8 publications

Nonlinear optics on nano/micro-hierarchical structures on metals: focus on symmetric and plasmonic effects

Nonlinear optics on nano/micro-hierarchical structures on metals: focus on symmetric and plasmonic effects

Virus‐Based Nanomotors for Cargo Delivery

Optical second harmonic generation from Pt nanowires with boomerang-like cross-sectional shapes

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