Optical Trapping and Raman Analysis using Single Plasmonic Nanoholes
碩士 === 國立清華大學 === 化學系 === 105 === Chiral molecules show slightly different absorbance of left- and right-handed circularly polarized light (CPL). Such circular dichroism (CD) effect can be used for the characterization of molecular chirality. Unfortunately, CD is usually very weak due to the...
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ndltd-TW-105NTHU50650192019-05-15T23:10:12Z http://ndltd.ncl.edu.tw/handle/kx7jkf Optical Trapping and Raman Analysis using Single Plasmonic Nanoholes 利用單一電漿奈米洞進行光學捕捉及拉曼分析 Huang, Zi Huan 黃子桓 碩士 國立清華大學 化學系 105 Chiral molecules show slightly different absorbance of left- and right-handed circularly polarized light (CPL). Such circular dichroism (CD) effect can be used for the characterization of molecular chirality. Unfortunately, CD is usually very weak due to the mismatch between the pitch of CPL helix and the size of molecular chiral domain. Plasmonic nanostructures can concentrate optical fields at nanometer scale and provide stiff optical potential to enhance optical chirality and improve CD signals. Plasmonic elliptical nanoholes can create the concentrated chiral optical near field based on localized surface plasmonic resonance (LSPR). The optical near field generated in nanohole can also provide trapping force to isolate, immobilize and manipulate the target nanoparticles. By controlling the polarization of the incident light, the chirality of the optical near field can be easily switched. Since the optical near field in the hole is circularly polarized, the Raman scattering also reveal the chirality of the target due to the Raman optical activity (ROA). This work is divided into two parts. First, we design and fabricate plasmonic circular nanoholes which are pave with R6G molecules. By measuring the Raman scattering spectrum of R6G molecules in single nanohole, we can then obtain the information between Raman intensity, near field enhancement and transmission enhancement. In second part, we use single nanohole to trap 20 nm polystyrene sphere with high reproducibility in stable state. In the further, combine optical trapping with plasmonic elliptical nanoholes, we are able to obtain ROA analysis by linearly polarized light in solution. Huang, Jer Shing 黃哲勳 2016 學位論文 ; thesis 75 zh-TW |
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碩士 === 國立清華大學 === 化學系 === 105 === Chiral molecules show slightly different absorbance of left- and right-handed circularly polarized light (CPL). Such circular dichroism (CD) effect can be used for the characterization of molecular chirality. Unfortunately, CD is usually very weak due
to the mismatch between the pitch of CPL helix and the size of molecular chiral domain.
Plasmonic nanostructures can concentrate optical fields at nanometer scale and provide stiff optical potential to enhance optical chirality and improve CD signals. Plasmonic elliptical nanoholes can create the concentrated chiral optical near field
based on localized surface plasmonic resonance (LSPR). The optical near field generated in nanohole can also provide trapping force to isolate, immobilize and manipulate the target nanoparticles. By controlling the polarization of the incident light, the chirality of the optical near field can be easily switched. Since the optical near field in the hole is circularly polarized, the Raman scattering also reveal the chirality of the
target due to the Raman optical activity (ROA).
This work is divided into two parts. First, we design and fabricate plasmonic circular nanoholes which are pave with R6G molecules. By measuring the Raman scattering spectrum of R6G molecules in single nanohole, we can then obtain the information between Raman intensity, near field enhancement and transmission enhancement. In second part, we use single nanohole to trap 20 nm polystyrene sphere
with high reproducibility in stable state.
In the further, combine optical trapping with plasmonic elliptical nanoholes, we are able to obtain ROA analysis by linearly polarized light in solution.
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author2 |
Huang, Jer Shing |
author_facet |
Huang, Jer Shing Huang, Zi Huan 黃子桓 |
author |
Huang, Zi Huan 黃子桓 |
spellingShingle |
Huang, Zi Huan 黃子桓 Optical Trapping and Raman Analysis using Single Plasmonic Nanoholes |
author_sort |
Huang, Zi Huan |
title |
Optical Trapping and Raman Analysis using Single Plasmonic Nanoholes |
title_short |
Optical Trapping and Raman Analysis using Single Plasmonic Nanoholes |
title_full |
Optical Trapping and Raman Analysis using Single Plasmonic Nanoholes |
title_fullStr |
Optical Trapping and Raman Analysis using Single Plasmonic Nanoholes |
title_full_unstemmed |
Optical Trapping and Raman Analysis using Single Plasmonic Nanoholes |
title_sort |
optical trapping and raman analysis using single plasmonic nanoholes |
publishDate |
2016 |
url |
http://ndltd.ncl.edu.tw/handle/kx7jkf |
work_keys_str_mv |
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