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Towards a nanocrystalline silicon laser.

Chen, Hui.

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Towards a nanocrystalline silicon laser.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Towards a nanocrystalline silicon laser./
Author:	Chen, Hui.
Description:	142 p.
Notes:	Advisers: Philippe M. Fauchet; Yongli Gao.
Contained By:	Dissertation Abstracts International68-08B.
Subject:	Physics, Condensed Matter. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3279134
ISBN:	9780549204800

Towards a nanocrystalline silicon laser.
Chen, Hui.

Towards a nanocrystalline silicon laser. - 142 p.

Advisers: Philippe M. Fauchet; Yongli Gao.

Thesis (Ph.D.)--University of Rochester, 2007.

Silicon nanocrystals (quantum dots) have shown great potential in light emission and optical amplification. The purpose of this work is to study the physics of light emission and optical gain in silicon nanocrystals and explore the possibility of a silicon nanocrystal laser. This dissertation discusses the following three sub-topics: effect of surface passivation on silicon nanocrystal light emission and optical gain, ultrafast carrier dynamics in different silicon nanocrystal systems, and fabrication and characterization of silicon nanocrystal based waveguides and laser resonators.

ISBN: 9780549204800Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Towards a nanocrystalline silicon laser.
LDR:03302nam 2200325 a 45 001 948296
005 20110524
008 110524s2007 ||||||||||||||||| ||eng d
020 $a 9780549204800
035 $a (UMI)AAI3279134
035 $a AAI3279134
040 $a UMI $c UMI
100 1 $a Chen, Hui. $3 1084303
245 1 0 $a Towards a nanocrystalline silicon laser.
300 $a 142 p.
500 $a Advisers: Philippe M. Fauchet; Yongli Gao.
500 $a Source: Dissertation Abstracts International, Volume: 68-08, Section: B, page: 5303.
502 $a Thesis (Ph.D.)--University of Rochester, 2007.
520 $a Silicon nanocrystals (quantum dots) have shown great potential in light emission and optical amplification. The purpose of this work is to study the physics of light emission and optical gain in silicon nanocrystals and explore the possibility of a silicon nanocrystal laser. This dissertation discusses the following three sub-topics: effect of surface passivation on silicon nanocrystal light emission and optical gain, ultrafast carrier dynamics in different silicon nanocrystal systems, and fabrication and characterization of silicon nanocrystal based waveguides and laser resonators.
520 $a Optical gain is studied by Variable stripe length method in silicon nanocrystal systems prepared by different methods including ion implantation, magnetron sputtering and plasma enhanced chemical vapor deposition (PECVD) and also of different surface passivations including oxide and nitride. In the oxide passivated nanocrystals, optical gain (up to 60 cm-1) is only observed in the PECVD sample which shows a fast emission component blue shifted from the main photoluminescence peak. In the nitride passivated nanocrystal no optical gain has been observed. The data suggest that oxide passivation plays an important role in providing optical gain from silicon nanocrystals.
520 $a Ultra-fast carrier dynamics in different silicon nanocrystal systems are investigated by femto-second pump probe technique. In oxide passivated nanocrystals, a fast (10-30 ps) carrier trapping in silicon nanocrystal surface states is followed by a slower (200-300 ps) carrier decay process. Neither the fast nor the slow decay component shows any lifetime dependence on pumping intensity. In nitride passivated nanocrystals, we did not observe any fast surface trapping process. The data fit well to a single exponential decay of &sim;100 ps lifetime. In both cases, the optical response of the probe signal is dominated by a negative differential transmittance, indicating a pump induced absorption (optical loss) of the probe signal.
520 $a Silicon nanocrystal waveguides are fabricated and optical losses of 13 dB/cm and 7 dB/cm are measured at 633 and 810 nm, respectively. To explore the possibility of lasing, silicon nanocrystal based laser resonators including lateral distributed Bragg reflector and microspheres are also fabricated and tested. No sign of lasing has been observed.
590 $a School code: 0188.
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 University of Rochester. $3 515736
773 0 $t Dissertation Abstracts International $g 68-08B.
790 $a 0188
790 1 0 $a Fauchet, Philippe M., $e advisor
790 1 0 $a Gao, Yongli, $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3279134