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Hot Luminescence in Plasmonic Silicon Metamaterials

  • 조회. 1770
  • 등록일. 2014.08.29
  • 작성자. Administrator

Hot Luminescence in Plasmonic Silicon Metamaterials

The research team of Prof. Chang-Hee Cho of Emerging Materials Department at DGIST(Daegu Gyeongbuk Institute of Science and Technology) has successfully explained ‘hot luminescence mechanism’ which significantly increases the radiative emission efficiency of semiconductor silicon materials. The research was carried out through an international joint research with a research team led by Professor Ritesh Agarwal at the University of Pennsylvania.


Through an application of the hot luminescence mechanism to plasmonic metamaterials, which are tailor-made composites of semiconductor silicon and metal, the joint research team has successfully induced luminescence from non-luminous semiconductor silicon.


Due to the low radiative emission efficiency of the semiconductor silicon, thus far, the material has been only utilized in electronic devices like computer processors and memories and there has been difficulties in developing semiconductor silicon based light-emitting devices.


The research team combined metallic cavity resonator and semiconductor silicon together and finally induced efficient luminescence in visible range using the hot luminescence mechanism. The team used "energy excitation and temperature-dependent spectroscopy" to identify that the hot luminescence was caused by the interaction between electrons and phonons in semiconductor silicon and plasmons in metal of the plasmonic metamaterials.


Living in the era of Smart, the speed of information transmission and processing based on electrical interconnects is thought to be approaching its limit and the demand of new technologies using light, so called silicon photonics technologies, has been increased. This has spurred investigation globally into the silicon photonics, which is an optical based information processing technology.


The research presented possibility of semiconductor silicon based light source with high radiative emission efficiency and made a step toward implementing technical realization of the silicon photonics.


Prof. Cho mentioned that “We could successfully explain hot luminescence mechanism in plasmonic metamaterials made of semiconductor silicon and metal through various spectroscopic experiments and theoretical modeling." He added “The research is expected to contribute to the development of high efficiency semiconductor silicon-based light sources and various optical devices."


More detailed information on this research is available at Nano Letters online published on August 19, 2014.