Enhancement and extinction effects in surface-enhanced stimulated Raman spectroscopy

Chng, Xiong Kai Benjamin

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https://hdl.handle.net/2142/78312 Copy

Description

Title

Enhancement and extinction effects in surface-enhanced stimulated Raman spectroscopy

Author(s)

Chng, Xiong Kai Benjamin

Issue Date

2015-02-20

Director of Research (if dissertation) or Advisor (if thesis)

Carney, Paul S.

Committee Member(s)

Carney, Paul S.

Department of Study

Electrical & Computer Eng

Discipline

Electrical & Computer Engr

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

• surface-enhanced stimulated Raman spectroscopy
• nonlinear optics

Abstract

Surface-enhanced Raman spectroscopy (SERS) is a technique that allows one to probe the vibrational modes of molecules with great precision. However, current methods involve the enhancement of local fields from spontaneous Raman scattering near a metallic substrate. By utilizing stimulated Raman scattering over spontaneous Raman scattering, the effect of the enhancement of the local fields will be increased due to nonlinear excitations. An electromagnetic derivation for the enhancement of local fields near the surface of a small metallic sphere due to stimulated Raman scattering is performed. In addition, the non-trivial relationship between the enhancement and extinction of the Raman signal is considered. Using the effective medium approach, an expression for the scattered Raman field of a collection of metallic nanoparticles that includes both these effects is formulated. Optimal parameters for surface-enhanced stimulated Raman spectroscopy (SESRS) are proposed based on the study of enhancement and extinction phenomena in the collection of nanoparticles.

Graduation Semester

2015-5

Type of Resource

text

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http://hdl.handle.net/2142/78312

Copyright and License Information

Copyright 2015 Xiong Kai Benjamin Chng

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