基于等离子体四极共振的金纳米长方体颗粒的折射率传感性能研究

doi:10.13883/j.issn1004-5929.202004007

光散射学报 ›› 2020, Vol. 32 ›› Issue (4) : 335-342. DOI: 10.13883/j.issn1004-5929.202004007

刘静雅^*, 张现周

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Study of the Refractive Index Sensing Performances of Au Nanocuboid Particles Based on the Plasmonic Quadrupole Resonance

LIU Jingya^*, ZHANG Xianzhou

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摘要

文章通过数值模拟系统地研究了单个金纳米长方体颗粒和金纳米长方体阵列的折射率传感性能。结果表明,四极共振的半峰全宽远小于偶极共振的半峰全宽。当纳米颗粒的边界变得尖锐时,四极共振的共振波长会发生“红移”,其折射率灵敏度和品质因子也会显著增加。金纳米长方体阵列的四极共振折射率传感性能(S≈787.72 nm /RIU, FOM≈13.82)优于单个颗粒的传感性能。等离子体四极共振在金纳米长方体阵列中的高灵敏度、大FOM和优异的稳定性使其在生物传感器领域具有潜在的应用前景。

Abstract

The refractive index (RI) sensing performances of the single large gold nanocuboid and the large Au nanocuboid arrays were systematically studied by numerical simulation. The results show that the full width at half maximum of quadrupole resonance is much smaller than that of dipole resonance for large asymmetric Au nanoparticles. When the ends of nanoparticles become angular (quadrate ends), the quadrupole resonance wavelength will occur “red shift”, and the quadrupole resonance would possess higher sensitivity and FOM. The RI sensing properties (S≈787.72 nm /RIU, and FOM≈13.82) of Au nanocuboid arrays at quadrupole resonance are both larger than the respective parameters of single particle. The high sensitivity, large FOM and superior stability of the quadrupole resonance in large Au nanocuboid arrays would endow it with potential application in the LSPR biosensor.

导出引用

刘静雅, 张现周. 基于等离子体四极共振的金纳米长方体颗粒的折射率传感性能研究. 光散射学报. 2020, 32(4): 335-342 https://doi.org/10.13883/j.issn1004-5929.202004007

LIU Jingya, ZHANG Xianzhou. Study of the Refractive Index Sensing Performances of Au Nanocuboid Particles Based on the Plasmonic Quadrupole Resonance. Chinese Journal of Light Scattering. 2020, 32(4): 335-342 https://doi.org/10.13883/j.issn1004-5929.202004007

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河南省重点科技攻关项目(192102210202)

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2020-02-20	2020-03-23	2020-12-10
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2022-08-22

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