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Optical spectroscopy of nano-structu...

Wang, Feng.

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Optical spectroscopy of nano-structures with femtosecond laser pulses.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Optical spectroscopy of nano-structures with femtosecond laser pulses./
Author:	Wang, Feng.
Description:	129 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4634.
Contained By:	Dissertation Abstracts International65-09B.
Subject:	Physics, Condensed Matter. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3147288
ISBN:	0496063731

Optical spectroscopy of nano-structures with femtosecond laser pulses.
Wang, Feng.

Optical spectroscopy of nano-structures with femtosecond laser pulses. - 129 p.

Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4634.

Thesis (Ph.D.)--Columbia University, 2004.

Femtosecond laser radiation, with its high peak power and time resolution, provides a powerful and versatile tool for optical spectroscopy. This thesis presents several spectroscopic techniques enabled by femtosecond lasers and their applications in characterizing and understanding novel nanostructured materials. There are two major themes in these studies. The first concerns the transport properties of free carriers within material systems exhibiting different degree of spatial confinement, in particular the markedly different behaviors observed in bulk material and nanoparticles. The second theme focuses on single-walled carbon nanotubes (SWNTs), including light emission and carrier dynamics in ensemble samples and Rayleigh spectroscopy of individual SWNTs.

ISBN: 0496063731Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Optical spectroscopy of nano-structures with femtosecond laser pulses.
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020 $a 0496063731
035 $a (UnM)AAI3147288
035 $a AAI3147288
040 $a UnM $c UnM
100 1 $a Wang, Feng. $3 1037905
245 1 0 $a Optical spectroscopy of nano-structures with femtosecond laser pulses.
300 $a 129 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4634.
500 $a Adviser: Tony F. Heinz.
502 $a Thesis (Ph.D.)--Columbia University, 2004.
520 $a Femtosecond laser radiation, with its high peak power and time resolution, provides a powerful and versatile tool for optical spectroscopy. This thesis presents several spectroscopic techniques enabled by femtosecond lasers and their applications in characterizing and understanding novel nanostructured materials. There are two major themes in these studies. The first concerns the transport properties of free carriers within material systems exhibiting different degree of spatial confinement, in particular the markedly different behaviors observed in bulk material and nanoparticles. The second theme focuses on single-walled carbon nanotubes (SWNTs), including light emission and carrier dynamics in ensemble samples and Rayleigh spectroscopy of individual SWNTs.
520 $a The carrier transport properties are studied via Terahertz time-domain spectroscopy (THz TDS), a method exploiting ultrashort pulsed far-infrared radiation. We have investigated the transport of photo-excited carriers in bulk large bandgap crystals and in semiconductor nanoparticles. In a large bandgap insulator like sapphire (Al2O3), we found that the carriers were highly mobile and that their frequency-dependent complex conductivity could be described by the free electron model. The response of the charge carriers changes dramatically, however, in semiconductor nanoparticles. This behavior is a manifestation of the quantum confinement effect in nano-sized materials.
520 $a In the study of SWNTs, an important family of nanostructured materials, we have examined their light emission and carrier dynamics using ultrafast techniques like time-resolved fluorescence and transient absorption. These measurements elucidate the different dynamical pathways for carriers in semiconducting carbon nanotubes---namely, radiative recombination, defect trapping, and Auger recombination---and the rates of these competing channels. To further characterize SWNTs at the single tube level, we have developed a novel microscopy technique based on Rayleigh scattering. The approach employs supercontinuum radiation generated by passing femtosecond laser pulses through microstructured fiber to study suspended SWNTs, and has yielded the electronic structures of individual nanotubes.
590 $a School code: 0054.
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Optics. $3 1018756
690 $a 0611
690 $a 0752
710 2 0 $a Columbia University. $3 571054
773 0 $t Dissertation Abstracts International $g 65-09B.
790 1 0 $a Heinz, Tony F., $e advisor
790 $a 0054
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3147288