Host Laboratory KAWAKATSU LAB.
Position in LIMMS EUJO-LIMMS Researcher (MESA+)
Main Research Topic in LIMMS NANOTECH - Micro Photoluminesce Characterization of Si Quantum Dots
Keywords

Quantum dots, micro photoluminescence

Contact

LIMMS/CNRS-IIS (UMI 2820) 
Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan 
Phone:+81 (0)3 5452 6036 / Fax:+81 (0)3 5452 6088

 

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Resume

Short resume :
2012-now  
2008-2012  
2004-2008

 

2001-2003  

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Research Projects in Limms

1- Micro Phtoluminesce Characterization of SI Quqntum Dots 
Context :
Novel 3D nano machining of Si developed at MESA+ offers the possibility of few nanometer, free standing Si quantum dots at the apex of a pyramid wire frame structure, Fig.1[1]. In principle, quantum condiment effects could be measured due to the small size of the dots> Futhermore, the confinement can result in a direct band gap making (electro-) optical experiments an interesting possibility.
 
Objectives & Methods :
The ultimate goal of this project is to achieve electrically controlled single photon emission form Si. The first step is optical characterization of the Si quantum dots by micro photoluminescence. A laser is used to excite carriers which leads to photon emission. Photoluminescence can provide information on electronic structure, band gap energy and carrier lifetimes [2]. A low quantum efficiency is expected due to the indirect band gap nature of Si and interference from the Si substrate could hinder measurement of the quantum dots.
Results :
A possible indication of quantum dot emission might have been measured by removing the quantum dots from the Si substrate by ultrasonic dispersion and depositing them on a Ge substrate. Figure 2 shows the measured spectrum. The main peak at approximately 813 nm could coincide with the measured size of the quantum dots.
References :
[1] Brenschot, J.W., et al., Nanotechnology, 20(47): p. 475302, 2009.
[2] M.Fox. Quqntum Optics: an introduction. Oxford University Press, New York, 2006.

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2013

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2012

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2011

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