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Title of Journal: Chin Sci Bull

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Abbravation: Chinese Science Bulletin

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SP Science China Press

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DOI

10.1007/bf00912561

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1861-9541

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FDTD for plasmonics Applications in enhanced Rama

Authors: ZhiLin Yang QianHong Li FangXiong Ruan ZhiPeng Li Bin Ren HongXing Xu ZhongQun Tian
Publish Date: 2010/08/14
Volume: 55, Issue: 24, Pages: 2635-2642
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Abstract

The exact electromagnetic enhancement mechanism behind SERS TERS HERS and SHINERS is one of the issues focused on in the study of enhanced Raman spectroscopy The three dimensional finite difference time domain method 3DFDTD which is widely used in nanoplasmonic simulations not only provides us with a powerful numerical tool for theoretical studies of the ERS electromagnetic enhancement mechanism but also serves as a useful tool for the design of ERSactive systems with higher sensitivities and spectral spatial resolution In this paper we first introduce the fundamental principles of FDTD algorithms and then the sizedependent dielectric function of dispersive metallic material is discussed A comparative study of FDTD and rigorous Mie evaluations of electromagnetic fields in the vicinity of a system of selfsimilar nanospheres shows an excellent correlation between the two computational methods directly confirming the validity and accuracy of 3DFDTD simulations in ERS calculations Finally we demonstrate using a TERS calculation as an example that the nonuniform mesh method can be more computationally efficient without loss of accuracy if it is applied correctly

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