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Investigation of novel optical scatt...

Chen, Zhigang.

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Investigation of novel optical scattering properties of micron-scale dielectric particles.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Investigation of novel optical scattering properties of micron-scale dielectric particles./
作者:	Chen, Zhigang.
面頁冊數:	110 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3303.
Contained By:	Dissertation Abstracts International66-06B.
標題:	Engineering, Electronics and Electrical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3177699
ISBN:	0542172887

Investigation of novel optical scattering properties of micron-scale dielectric particles.
Chen, Zhigang.

Investigation of novel optical scattering properties of micron-scale dielectric particles. - 110 p.

Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3303.

Thesis (Ph.D.)--Northwestern University, 2005.

This dissertation presents an examination of novel optical scattering properties of micron-scale dielectric particles with applications to light scattering spectroscopy and ultrasensitive nanoparticle detection.

ISBN: 0542172887Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

Investigation of novel optical scattering properties of micron-scale dielectric particles.
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245 1 0 $a Investigation of novel optical scattering properties of micron-scale dielectric particles.
300 $a 110 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3303.
500 $a Adviser: Allen Taflove.
502 $a Thesis (Ph.D.)--Northwestern University, 2005.
520 $a This dissertation presents an examination of novel optical scattering properties of micron-scale dielectric particles with applications to light scattering spectroscopy and ultrasensitive nanoparticle detection.
520 $a Using the finite-difference time-domain (FDTD) method and Wentzel-Kramers-Brillouin (WKB) approximation, the spectral dependence of scattering cross sections of inhomogeneous and nonspherical dielectric particles is investigated. The equivalent volume-averaged scattering behavior is identified in light scattering by randomly inhomogeneous dielectric spheres, and the concept of the equiphase sphere is proposed to model light scattering by nonspherical dielectric particles. These approaches are useful for analyzing the spectral dependence of light scattering by inhomogeneous and nonspherical particles such as biological cells and nuclei. Applications of these studies include light scattering spectroscopy for probing cellular structures and morphology, and noninvasive detection of precancerous and early cancerous changes in the human epithelium.
520 $a In addition, the near-field scattering properties of dielectric microcylinders and microspheres are investigated using the FDTD method and rigorous analytical theory. In particular, physical phenomena involving localized photonic "nanojets" are explored. First, it is shown that photonic nanojets have waists as narrow as about 100 nm (smaller than the diffraction limit), and propagate over several optical wavelengths without significant diffraction. Second and even more remarkably, it is shown that a photonic nanojet can increase the backscattering of visible light by a nanometer-scale particle located within the nanojet by several orders of magnitude. Both analytical and perturbation analyses are provided which show that the resulting backscattering by the nanoparticle is proportional to the third power of its size parameter. This is a significant dimensional increase relative to the classical Rayleigh backscattering intensity, which is proportional to the sixth power of the size parameter. 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 similarly sized nanoparticles.
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650 4 $a Physics, Optics. $3 1018756
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