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Absorption suppression of silver nanoparticles in the presence of an AFM tip: A harmonic oscillator model

Title	Absorption suppression of silver nanoparticles in the presence of an AFM tip: A harmonic oscillator model
Author	Huda, G. M., Mengüç, Mustafa Pınar, Hastings, J. T.
Publication Date:	2012
Publication Place	- AIP
Subject	Plasmonics, Absorption, Finite element method, Evanescent wave, Harmonic oscillator, AFM
Type	Document
Language	English
Digital	Yes
Manuscript	No
Library:	Özyeğin University
Library Asset ID	0094-243X
Record ID	57abf5d1-4fa4-4148-b243-0f4b8c963f55
Library Location	Mechanical Engineering
Date	2012
Notes	Due to copyright restrictions, the access to the full text of this article is only available via subscription.
Sample Text	We numerically calculated the optical absorption of silver nanoparticles (AgNP) in the presence of metallic and dielectric AFM probes, illuminated by transverse magnetic (TM) polarized, total internal reflected waves. Nanoscale probes localize and enhance the field between the apex of the tip and the particle. However, such probes can actually suppress the optical absorption of the AgNP. To better understand this phenomenon, we fitted the numerical absorption data with the equation of a driven damped harmonic oscillator (HO), and we found that the AFM tip modifies both the driving force and increases the overall damping of the oscillator by introducing an additional radiative decay path. For a 50 nm diameter AgNP the introduction of either a metallic or dielectric AFM probe suppresses absorption.
DOI	10.1063/1.4750120
Cilt	1475

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Absorption suppression of silver nanoparticles in the presence of an AFM tip: A harmonic oscillator model

Author Huda, G. M., Mengüç, Mustafa Pınar, Hastings, J. T.

Publication Date 2012

Publication Place - AIP

Subject Plasmonics, Absorption, Finite element method, Evanescent wave, Harmonic oscillator, AFM

Type Document

Language English

Digital Yes

Manuscript No

Library Özyeğin University

Library Asset ID 0094-243X

Record ID 57abf5d1-4fa4-4148-b243-0f4b8c963f55

Library Location Mechanical Engineering

Date 2012

Notes Due to copyright restrictions, the access to the full text of this article is only available via subscription.

Sample Text We numerically calculated the optical absorption of silver nanoparticles (AgNP) in the presence of metallic and dielectric AFM probes, illuminated by transverse magnetic (TM) polarized, total internal reflected waves. Nanoscale probes localize and enhance the field between the apex of the tip and the particle. However, such probes can actually suppress the optical absorption of the AgNP. To better understand this phenomenon, we fitted the numerical absorption data with the equation of a driven damped harmonic oscillator (HO), and we found that the AFM tip modifies both the driving force and increases the overall damping of the oscillator by introducing an additional radiative decay path. For a 50 nm diameter AgNP the introduction of either a metallic or dielectric AFM probe suppresses absorption.

DOI 10.1063/1.4750120

Cilt 1475