MIOMD-XI Speakers    
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1.  Mr. Hoo Kim, The University of Texas at Austin, USA
Late-Breaking Results: Effect of square holes to reduce thermal mass in dipole patterned resistive sheets metamaterial microbolometer.
Speaker Biography: Hoo Kim is a current Ph.D. student of Electromagnetics Device Group in Microelectronics Research Center at the University of Texas at Austin. He received his B.S. and M.S. degrees in Elecrrical Engineering from POSTECH (Pohang University of Science and Technology) in 2004 and 2006, respectively. He worked as an officer and a full-time instructor in Korea Air Force Academy from 2006 to 2009 as well. His research interests are 3D multispectral microbolometer, its wavelength selective characteristics and application of frequency selective surface and metamaterials for microbolometer.

Summary: In a microbolometer, the thermal mass is critical in determining the speed of the detector. In multicolor microbolometers, patterned metamaterial absorbers formed by crossed-slot holes in a conducting sheet can be used to produce spectrally selective absorption. From previous results from our group, we also know that square hole patterns in a conducting sheet work can act as a broadband absorber, and that when the holes are extended through a dielectric sheet that supports the metal efficient absorbtion can be maintained with substantial reduction thermal mass. In this paper, we suggest optimal sized square holes can reduce the thermal mass without changing spectral selectivity for narrowband absorption using crossed-dipole absorbers. The design uses dipole-like patterned resistive sheets on a perforated germanium support layer above an air gap and mirror. Absorption efficiency has been compared to the optimized case which has only a dipole resistive sheets without holes for cases both with and without mirror. In the long-wave infrared band, optimal perforation size has been studied with optimized dipole patterned resistive sheets to yield peak absorption at 10 micron. The perforations produce considerably reduced thermal mass (over 30%) at their optimal size. Also, interference between patterned resistive sheets and perforation size has been studied, showing this interference causes significant change in the peak absorption when the perforation area is increased beyond the optimal size.
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