利用單一電漿奈米洞進行光學捕捉及拉曼分析

黃子桓

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利用單一電漿奈米洞進行光學捕捉及拉曼分析

Optical Trapping and Raman Analysis using Single Plasmonic Nanoholes

黃子桓 , Masters　　Advisor：黃哲勳　　

繁體中文

表面電漿共振；拉曼分析；光學捕捉； surface plasmon resonance ； raman analysis ； optical trapping

Abstract │ Reference (52) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

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.

Reference ( 52 ) 〈TOP〉

1. Zayats, A.V., I.I. Smolyaninov and A.A. Maradudin, "Nano-optics of surface plasmon polaritons," Physics Reports 408, 131-314 (2005)
連結：
2. Pitarke, J.M., V.M. Silkin, E.V. Chulkov and P.M. Echenique, "Theory of surface plasmons and surface-plasmon polaritons," Rep. Prog. Phys. 70, 1-87 (2007)
連結：
3. Willets, K.A. and R.P. Van Duyne, "Localized surface plasmon resonance spectroscopy and sensing," Annu. Rev. Phys. Chem. 58, 267-297 (2007)
連結：
4. Nie, S. and S.R. Emory, "Probing Single Molecules and Single Nanoparticles by Surface-Enhanced Raman Scattering," Science 275, 1102-1106 (1997)
連結：
5. Chen, C., N. Hayazawa and S. Kawata, "A 1.7 nm resolution chemical analysis of carbon nanotubes by tip-enhanced Raman imaging in the ambient," Nat Commun 5, 3312 (2014)
連結：

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