1540nm optical gain in Er doped Si nanocluster sensitized waveguide = 어븀이 첨가된 실리콘 나노결정 광도파로에서의 1540nm 광증폭 특성

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Optical gain characteristics of Erbium doped Silicon Rich Silicon Oxide(SRSO) optical waveguide amplifier was investigated. Er doped SRSO thin films, which consist of Si nanoclusters embedded inside a $SiO_2$ matrix, were prepared by electron cyclotron resonance plasma enhanced chemical vapor deposition with co-sputtering of erbium target. We found that thermal annealing of SRSO film at ~ 950℃ for 5minutes result in long lifetime and strong luminescence film suitable for making waveguide amplifier by forming high quality nanocrystals and removing defect states inside silica. It is estimated that optimum composition for waveguide amplifier is 1 at.% excess Si and ~ 0.03 at.% Er. Photoluminescence excitation spectrum showed that Er in SRSO can be very efficiently excited by earning the energy from silicon nanocrystal absorbing pumping signal, through which mechanism Er in SRSO can emit 1540nm light much more efficiently than that in silica. Ridge type-single mode waveguide was made out of Er doped SRSO thin film with above condition by chemical etching using BOE and mechanically polished to couple light signal efficiently. Signal enhancement was measured by pumping the ridge waveguide on the top with 477nm Ar ion laser line, not Er optical absorption band. Huge enhancement which cannot be explained by Er in glass confirms that gain in Er doped SRSO waveguide amplifier is attributed to Er interacted with nanocluster. From simulation using absorption spectrum, signal enhancement curve and rate equation it was concluded that Er emission crosssection at 1535nm is $1.7× 10^{-19}㎠$, larger than that of silica by an order of magnitude. From gain curve analysis for pumping flux, effective absorption crosssection of Er in SRSO at 477nm was $\simeq$ $10^{-17}㎠$. It is also four orders of magnitude larger than that of Er direct absorption excitation. It is confirmed that free carrier loss due to the free carrier from silicon nanocrystal was suppressed by showing there are n...
Advisors
Shin, Jung-H.researcher신중훈researcher
Description
한국과학기술원 : 물리학과,
Publisher
한국과학기술원
Issue Date
2003
Identifier
231013/325007  / 000995399
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 물리학과, 2003.8, [ vii, 80 p. ]

Keywords

optical communication; optical amplifier; Er; silicon; nanocrystal; 나노 결정; 광통신; 광증폭기; 어븀; 실리콘

URI
http://hdl.handle.net/10203/47331
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=231013&flag=dissertation
Appears in Collection
PH-Theses_Ph.D.(박사논문)
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