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Optofluidic Lasers and their Bio-sensing Applications

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What
  • Visitor Seminars
When Nov 22, 2013
from 02:00 PM to 03:30 PM
Where Engr. IV Bldg., Tesla Room 53-125
Contact Name
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Wonsuk Lee

University of Michigan, Ann Arbor

 

Abstract

Novel optofluidic ring resonator (OFRR) lasers resolving problems of existing schemes are suggested and DNA melting analysis with the laser is demonstrated. A PDMS-based OFRR laser using two optically coupled ring resonators in different sizes has addressed an intrinsic multi-mode emission of ring resonator laser. The single-wavelength lasing by Vernier effect can be tuned by modification of refractive index of the gain medium as well. A micro-bubble filled with liquid gain medium mimics the droplets in air that have 3-dimensional optical confinement. The quasi-droplet laser based on the micro-bubble shows superior lasing characteristics due to its sub-micron thin wall and enables repetitive interrogation and easy directional laser emission out-coupling without evaporation or size/shape variations. Microdroplets are delivered to the capillary OFRR downstream and laser emission, which can conveniently be coupled into an optical fiber, is achieved. An efficient FRET lasing is also demonstrated making the microdroplet an attractive reaction chamber with small sample volume. Furthermore, an intracavity DNA melting analysis dramatically improves discrimination of optical signals. The laser amplifies thermodynamic difference in between the target DNA and the base-mismatched DNA. The optofluidic laser based DNA analysis leads to novel optofluidic devices that enable rapid and simple analysis of DNA sequences.

 

Biography

Dr. Wonsuk Lee received his Ph.D.  in Electrical Engineering from the University of Michigan in 2013, after receiving his B.S. and M.S in Electrical Engineering and Computer Science from Seoul National University in 2006 and 2009, respectively. His research activities focus on bio-optics and involve topics ranging from optofluidic lasers and optical sensors analyzing DNA sequences and detecting single particles. He has published 11 papers on optofluidic lasers and sensors and 2 papers on OLED/LCD devices. He was a recipient of Rackham graduate student research grant from the University of Michigan and distinguished dissertation award from Seoul National University.

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