Selective Mapping of Tip-Launched Near-Field Scattering of Surface Plasmon Polaritons for Retrieving Dispersion Relation in Silver Nanoflakes
- Authors
- Woo, Hwi Je; Ji, Sangmin; Han, Jaewon; Woo, Seongwon; Kim, Hyuntae; Kim, Seonyeong; Lee, Chang-Won; Choi, Soobong; Kim, Deok-Soo; Jeong, Mun Seok; Hwang, Euyheon; Lim, Byungkwon; Song, Young Jae
- Issue Date
- Feb-2023
- Publisher
- AMER CHEMICAL SOC
- Keywords
- scattering-type near-field scanning optical microscopy (s-NSOM); surface plasmon polariton (SPP); mono-crystalline silver nanoflakes; tip-launched SPP; dispersion relation
- Citation
- ACS APPLIED NANO MATERIALS, v.6, no.4, pp.2560 - 2568
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED NANO MATERIALS
- Volume
- 6
- Number
- 4
- Start Page
- 2560
- End Page
- 2568
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/185011
- DOI
- 10.1021/acsanm.2c04870
- Abstract
- Scattering-type near-field scanning optical microscopy (s-NSOM) has been beneficial for observing various nano-optical phenomena by overcoming the spatial resolution diffraction limit, creating optical dispersion, and investigating optoelectronic systems. We used s-NSOM on mono-crystalline silver nanoflakes to selectively decompose tip-launched surface plasmon polariton (SPP) signals and suppress the undesired geometrical effects arising from the silver nanoflakes and s-NSOM tips. Comparing the Fourier transform analysis data from all the edges of silver nanoflakes, we successfully identified the momentum of tip-launched SPPs. We have conducted energy spectral measurements on mono-crystalline silver nanoflakes and applied a geometry-independent factor: tip-launched SPP. We neglected the additional complex contribution from various shapes of the nanoflakes in the visible-near infrared regime. These experimentally obtained momentums of SPPs have a good agreement with analytical calculations. We observed that the propagation of the SPP increases with a decrease in excitation energy even without additional destructive fabrications on the surface, although the surface quality of silver nanoflakes is affected by dirt and oxidation. This study provides a precise interpretation of the experimental studies on the various polariton studies using s-NSOM.
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