金領結型奈米天線之非線性散射現象及其機制探究

李冠郁

doi:10.6342/NTU201600948

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金领结型奈米天线之非线性散射现象及其机制探究

Nonlinear Scattering in Single Gold Bowtie Nanoantennae and Investigations of its Mechanism

李冠郁 , 硕士　　导师：朱士维　　

英文 DOI： 10.6342/NTU201600948

金领结型奈米天线；电浆子学；非线性散射；截面积；场提升强度；时域有限差分法； Gold Bowtie Nanoantenna ； Plasmonics ； Nonlinear Scattering ； Cross Section ； Field Enhancement ； Finite Difference Time Domain

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摘要 │ 参考文献 (57) │ 国际计量

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Nonlinear scattering has been observed in a single gold nanosphere (GNS) under high-intensity laser illumination with wavelength inside the plasmonic resonance band. It has been already applied to novel non-bleaching super-resolution microscopy based on scattering, with STED-like and SAX-like setup. Previous spectral analyses show nonlinear scattering is highly related to localized surface plasmon resonance (LSPR) in the gold nanoparticle. When the applied wavelength is closer to the resonance peak, the nonlinearity becomes observable in lower excitation intensity. However, the underlying mechanism is not fully unterstood. LSPR in metallic nanoparticles is known for enhancing both the scattering/absorption cross section and the large field enhancement in near-field. Both factors are plausible to account for the mechanism of nonlinear scattering. It is not simple to manipulate cross section and field enhancement in a single GNS due to its spherical symmetry, so the dominant factor can not been determined with nanosphere experiment only. In this study, gold bowtie nanoantennae (GNA) are used to distinguish the effect of these factors. Because of the symmetry breaking, there are two orthogonal resonance modes in GNAs with polarization either parallel or perpendicular to the bowtie axis. These two modes can give comparable cross section but significantly distinct field enhancement. The magnitude of cross section and field enhancement can be calculated by finite difference time domain method. By comparing the change of the intensity threshold, when nonlinearity becomes observable, with the change in cross section and field enhancement, one can determine the dominating factor. The result eliminates the possibility of field enhancement being dominant, giving insights of the underlying mechanism related to absorption cross section. The findings would help searching for more materials or structures for nonlinear scattering.

参考文献 ( 57 ) 〈TOP〉

[1] H. Lee, R. Oketani, Y. T. Huang, K. Y. Li, Y. Yonemaru, M. Yamanaka, S. Kawata, K. Fujita, and S. W. Chu. Point spread function analysis with saturable and reverse saturable scattering. Optics Express, 22(21):26016–26022, 2014.
连结：
[2] S. W. Chu, H. Y. Wu, Y. T. Huang, T. Su, H. Lee, Y. Yonemaru, M. Yamanaka, R. Oketani, S. Kawata, S. Shoji, and K. Fujita. Saturation and reverse saturation of scattering in a single plasmonic nanoparticle. ACS Photonics, 1(1):32–37, 2014.
连结：
[3] S. Dodson, M. Haggui, R. Bachelot, J. Plain, S. Li, and Q. Xiong. Optimizing electromagnetic hotspots in plasmonic bowtie nanoantennae. The Journal of Physical Chemistry Letters, 4(3):496–501, 2013.
连结：
[4] R. H. Ritchie. Plasma losses by fast electrons in thin films. Physical Review, 106(5):874–881, 1957.
连结：
[5] M. Kauranen and A. V. Zayats. Nonlinear plasmonics. Nature Photonics, 6(11):737–748, 2012.
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引用含有DOI的文献

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。 如想对DOI的使用与概念有进一步了解，请参考 （ ） 。

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。如想对DOI的使用与概念有进一步了解，请参考（）。