2D Numerical Analysis and Potential Applications of The Photonic Nanojet
Date Issued
2007
Date
2007
Author(s)
Chang, Wei-Tien
DOI
zh-TW
Abstract
The near-field scattering properties of dielectric micro-cylinders are investigated using the FDTD method. In particular, physical phenomena involving localized photonic “nanojets” are explored. Firstly, it is shown that photonic nanojets exhibit waists as narrow as 40nm (smaller than the diffraction limit), and propagate over several optical wavelengths without significant diffraction. Secondly, by inserting a nanometer-scale particle at surface of a semi-cylinder, it is shown that a photonic nanojet increases the backscattering of visible light. Potential applications of this "super-enhanced” backscattering phenomenon include visible-light detection and characterization of nanoparticles as small as clusters of a few hundred atoms. Other potential applications include manipulation and modification of nanoparticles. Most importantly, the photonic nanojet provides a useful means to overcome the diffraction limit.
Subjects
近場
時域有限差分法
near-field
FDTD
nanojet
Type
thesis
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