PHYSICS/BK21 SEMINAR * (07/11/23)
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"제목: On the road to true silicon lasers using nanoparticles
연사: Anton Fojtik and Milan Kalal
[Faculty of Nuclear Sciences and Physical Engineering, Czech]
일시: 2007 년 11 월 23 일 10 ~
장소: 물리학과 세미나실(공학3동 201호)
ABSTRACT:
To satisfy the need for CPU clock frequencies continuous increase, optical data transmission process integrated within silicon chips is required. Practical optical amplification in silicon is therefore very desirable. Unfortunately, bulk silicon is an indirect bandgap semiconductor and as such has very low light emission efficiency. To overcome this problem stimulated Raman scattering has been successfully employed for light amplification and lasing in silicon. Due to the two-photon absorption nonlinear optical loss this scheme was initially working only in pulsed operation mode. Very recently an improved design allowed also for the continuous operation. However, this encouraging development still contains a major drawback - a need for an external optical pumping. It seems that this problem might be dealt with by switching from the bulk silicon to its properly prepared nano-crystalline form provided a reasonably good electroluminescence can be achieved. An intensive research is under way with some first promising results already in the pipeline.
문의처: 김동언(054-279-2089, kimd@postech.ac.kr)"
연사: Anton Fojtik and Milan Kalal
[Faculty of Nuclear Sciences and Physical Engineering, Czech]
일시: 2007 년 11 월 23 일 10 ~
장소: 물리학과 세미나실(공학3동 201호)
ABSTRACT:
To satisfy the need for CPU clock frequencies continuous increase, optical data transmission process integrated within silicon chips is required. Practical optical amplification in silicon is therefore very desirable. Unfortunately, bulk silicon is an indirect bandgap semiconductor and as such has very low light emission efficiency. To overcome this problem stimulated Raman scattering has been successfully employed for light amplification and lasing in silicon. Due to the two-photon absorption nonlinear optical loss this scheme was initially working only in pulsed operation mode. Very recently an improved design allowed also for the continuous operation. However, this encouraging development still contains a major drawback - a need for an external optical pumping. It seems that this problem might be dealt with by switching from the bulk silicon to its properly prepared nano-crystalline form provided a reasonably good electroluminescence can be achieved. An intensive research is under way with some first promising results already in the pipeline.
문의처: 김동언(054-279-2089, kimd@postech.ac.kr)"
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