Abstract
A detailed characterization of plasmon modes is important not only for a deeper understanding of plasmons but also for their practical applications. In this study, we investigated the three-dimensional near-field characteristics of high-order plasmon modes excited in a gold hexagonal nanoplate. From the near-field spectroscopic images, we found that both in-plane and out-of-plane plasmon modes observed near 900 nm were spectrally and spatially overlapped. We performed three-dimensional near-field measurement to reveal the optical characteristics of the overlapped modes in detail. We found that the steric near-field distribution near the nanoplate strongly depended on the plasmon mode, and the out-of-plane mode confines electromagnetic fields more tightly than the in-plane mode. We also found that the in-plane mode was dominantly visualized as the probe tip-sample distance increased. These findings demonstrate that the three-dimensional near-field technique enables selective visualization of a single plasmon mode even if multiple modes are spatially and spectrally overlapped.
| Original language | English |
|---|---|
| Pages (from-to) | 819-824 |
| Number of pages | 6 |
| Journal | Journal of Physical Chemistry Letters |
| Volume | 10 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2019 Feb 21 |
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ASJC Scopus subject areas
- Materials Science(all)
- Physical and Theoretical Chemistry
Cite this
Characterization of overlapped plasmon modes in a gold hexagonal plate revealed by three-dimensional near-field optical microscopy. / Matsuura, Takuya; Imaeda, Keisuke; Hasegawa, Seiju; Suzuki, Hiromasa; Imura, Kohei.
In: Journal of Physical Chemistry Letters, Vol. 10, No. 4, 21.02.2019, p. 819-824.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Characterization of overlapped plasmon modes in a gold hexagonal plate revealed by three-dimensional near-field optical microscopy
AU - Matsuura, Takuya
AU - Imaeda, Keisuke
AU - Hasegawa, Seiju
AU - Suzuki, Hiromasa
AU - Imura, Kohei
PY - 2019/2/21
Y1 - 2019/2/21
N2 - A detailed characterization of plasmon modes is important not only for a deeper understanding of plasmons but also for their practical applications. In this study, we investigated the three-dimensional near-field characteristics of high-order plasmon modes excited in a gold hexagonal nanoplate. From the near-field spectroscopic images, we found that both in-plane and out-of-plane plasmon modes observed near 900 nm were spectrally and spatially overlapped. We performed three-dimensional near-field measurement to reveal the optical characteristics of the overlapped modes in detail. We found that the steric near-field distribution near the nanoplate strongly depended on the plasmon mode, and the out-of-plane mode confines electromagnetic fields more tightly than the in-plane mode. We also found that the in-plane mode was dominantly visualized as the probe tip-sample distance increased. These findings demonstrate that the three-dimensional near-field technique enables selective visualization of a single plasmon mode even if multiple modes are spatially and spectrally overlapped.
AB - A detailed characterization of plasmon modes is important not only for a deeper understanding of plasmons but also for their practical applications. In this study, we investigated the three-dimensional near-field characteristics of high-order plasmon modes excited in a gold hexagonal nanoplate. From the near-field spectroscopic images, we found that both in-plane and out-of-plane plasmon modes observed near 900 nm were spectrally and spatially overlapped. We performed three-dimensional near-field measurement to reveal the optical characteristics of the overlapped modes in detail. We found that the steric near-field distribution near the nanoplate strongly depended on the plasmon mode, and the out-of-plane mode confines electromagnetic fields more tightly than the in-plane mode. We also found that the in-plane mode was dominantly visualized as the probe tip-sample distance increased. These findings demonstrate that the three-dimensional near-field technique enables selective visualization of a single plasmon mode even if multiple modes are spatially and spectrally overlapped.
UR - http://www.scopus.com/inward/record.url?scp=85061542932&partnerID=8YFLogxK
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U2 - 10.1021/acs.jpclett.8b03578
DO - 10.1021/acs.jpclett.8b03578
M3 - Article
C2 - 30735394
AN - SCOPUS:85061542932
VL - 10
SP - 819
EP - 824
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
SN - 1948-7185
IS - 4
ER -