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Study on advanced photonics and electronics: Plasmonic nanoscale approaches and deformable macroscale approaches

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What
  • Visitor Seminars
When Dec 20, 2012
from 02:00 PM to 03:00 PM
Where Tesla Room, 53-125 Engr IV
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Dr. Sung-Min Lee

KAIST

 

Abstract

Photonic and electronic technologies are continuously challenged for satisfying human desires to be more comfortable. This talk will present my efforts to contribute to advanced photonics and electronics based on nanoscale and macroscale approaches.

 

The first section is for the studies through nanoscale approaches. These studies include the efficiencies of optoelectronic devices, plasmonic color filters, surface plasmon (SP) nanolithography, and hybrid SP resonance modes. 1) The efficiencies of the optoelectronic devices were improved by introduction of metallic nanoparticles and nanostructures. For instance, the illuminating devices, such as organic light-emitting diodes, obtained the high efficiency by reducing the SP waveguide loss, and the solar cell efficiency was increased by manipulating the field enhancement. 2) Plasmonic nanoapertures in a metallic film exhibit the extraordinary optical transmission due to the SP waveguide modes. This property means that the perforated metallic films can act as transparent electrodes or color filters by controlling the SP resonance frequency and bandwidth. The aperture structures were carefully designed by using finite-difference time-domain simulations for obtaining the target frequencies and bandwidths. The samples with the nanoapertures were fabricated via colloidal lithography or laser interference lithography. 3)

The SP waves from the nanoapertures can interfere with each other, thereby generating greatly short-period standing-wave patterns. This is a basis for explaining how this standing-wave pattern is applicable to nanolithography. 4) Additionally, the fundamental study related to hybrid SP modes in separated metal layers will be presented.

 

The second section is for the studies through macroscale approaches. These studies cover flexible and stretchable electronics.

1) Flexible electronics are very promising in the near future due to their versatility. For the flexible electronics, flexible and transparent electrodes with the very low resistances were developed by using Ag-ZnO stacks. In addition, flexible displays on textile substrates were investigated for wearable electronics. 2) Beyond flexible electronics, stretchable electronics have attracted attention recently because of their broad applications including bio-applications. Related to this, ongoing study that uses serpentine microbridges will beintroduced.

 

Finally, I will discuss further studies anticipated in the Ozcan Research Group.

 

Biography

Sung-Min Lee received the B.S. degree from the Department of Electrical Engineering, Seoul National University in 2006, and the M.S. and Ph.D. degrees from the Department of Electrical Engineering, KAIST in 2008 and 2012, respectively. He is now working as a postdoctoral fellow in KAIST. His research interests include plasmonic nanophotonics and advanced optoelectronic devices.

He has published 10 journal papers including 6 first-authored papers and 22 conference papers, and has received the Best Thesis Award of Ph.D. Degree from KAIST in 2012, the Award of MEST of Korea in the International Meeting on Information Display 2007, and several Honor Prizes.

 

 

For more information, contact Prof. Aydogan Ozcan (ozcan@ee.ucla.edu)

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