Influence of localized surface plasmon resonance and free electrons on the optical properties of ultrathin Au films : a study of the aggregation effect
The contributions of localized surface plasmon resonance (LSPR) and Drude (free electrons) absorption to the complex dielectric function of ultrathin Au films were investigated with spectroscopic ellipsometry. When the Au film thickness is thinner than ~10 nm, Au nanoparticles (NPs) are formed as a...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2014
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| Online Access: | https://hdl.handle.net/10356/102912 http://hdl.handle.net/10220/19068 |
| _version_ | 1826113965922451456 |
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| author | Li, X. D. Chen, T. P. Liu, Y. Leong, K. C. |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Li, X. D. Chen, T. P. Liu, Y. Leong, K. C. |
| author_sort | Li, X. D. |
| collection | NTU |
| description | The contributions of localized surface plasmon resonance (LSPR) and Drude (free electrons) absorption to the complex dielectric function of ultrathin Au films were investigated with spectroscopic ellipsometry. When the Au film thickness is thinner than ~10 nm, Au nanoparticles (NPs) are formed as a result of the discontinuity in the films, leading to the emergence of LSPR of Au NPs; and the LSPR exhibits a splitting when the films thinner than ~8 nm, which could be attributed to the near-field coupling of the Au NPs and/or the inhomogeneous polarizations of the Au NPs. On the other hand, the delocalization of electrons in Au NPs due to the aggregation of Au NPs in a thicker film leads to an increase in the free-electron absorption and a suppression of the LSPR. |
| first_indexed | 2024-10-01T03:31:49Z |
| format | Journal Article |
| id | ntu-10356/102912 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:31:49Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | ntu-10356/1029122020-03-07T13:57:29Z Influence of localized surface plasmon resonance and free electrons on the optical properties of ultrathin Au films : a study of the aggregation effect Li, X. D. Chen, T. P. Liu, Y. Leong, K. C. School of Electrical and Electronic Engineering DRNTU::Engineering::Electrical and electronic engineering The contributions of localized surface plasmon resonance (LSPR) and Drude (free electrons) absorption to the complex dielectric function of ultrathin Au films were investigated with spectroscopic ellipsometry. When the Au film thickness is thinner than ~10 nm, Au nanoparticles (NPs) are formed as a result of the discontinuity in the films, leading to the emergence of LSPR of Au NPs; and the LSPR exhibits a splitting when the films thinner than ~8 nm, which could be attributed to the near-field coupling of the Au NPs and/or the inhomogeneous polarizations of the Au NPs. On the other hand, the delocalization of electrons in Au NPs due to the aggregation of Au NPs in a thicker film leads to an increase in the free-electron absorption and a suppression of the LSPR. Published version 2014-04-01T08:10:18Z 2019-12-06T21:02:12Z 2014-04-01T08:10:18Z 2019-12-06T21:02:12Z 2014 2014 Journal Article Li, X. D., Chen, T. P., Liu, Y., & Leong, K. C. (2014). Influence of localized surface plasmon resonance and free electrons on the optical properties of ultrathin Au films: a study of the aggregation effect. Optics Express, 22(5), 5124-5132. 1094-4087 https://hdl.handle.net/10356/102912 http://hdl.handle.net/10220/19068 10.1364/OE.22.005124 en Optics express © 2014 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint (preprint) with permission of Optical Society of America. The paper can be found at the following official DOI: [http://dx.doi.org/10.1364/OE.22.005124]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. application/pdf |
| spellingShingle | DRNTU::Engineering::Electrical and electronic engineering Li, X. D. Chen, T. P. Liu, Y. Leong, K. C. Influence of localized surface plasmon resonance and free electrons on the optical properties of ultrathin Au films : a study of the aggregation effect |
| title | Influence of localized surface plasmon resonance and free electrons on the optical properties of ultrathin Au films : a study of the aggregation effect |
| title_full | Influence of localized surface plasmon resonance and free electrons on the optical properties of ultrathin Au films : a study of the aggregation effect |
| title_fullStr | Influence of localized surface plasmon resonance and free electrons on the optical properties of ultrathin Au films : a study of the aggregation effect |
| title_full_unstemmed | Influence of localized surface plasmon resonance and free electrons on the optical properties of ultrathin Au films : a study of the aggregation effect |
| title_short | Influence of localized surface plasmon resonance and free electrons on the optical properties of ultrathin Au films : a study of the aggregation effect |
| title_sort | influence of localized surface plasmon resonance and free electrons on the optical properties of ultrathin au films a study of the aggregation effect |
| topic | DRNTU::Engineering::Electrical and electronic engineering |
| url | https://hdl.handle.net/10356/102912 http://hdl.handle.net/10220/19068 |
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