Position : Scientist; Adjunct
Professor of Physics & Astronomy, and Electrical & Computer
Office: A506 Physics
Phone: (515) 294-6987
Dr. Biswas received the Ph.D. in Physics from Cornell University. He has been a Consultant to the Xerox Palo Alto Research Center; Postdoctoral Member of Staff, AT&T Bell Laboratories; and Consultant to Exxon Research and Engineering Company.
Research being conducted by Dr. Biswas spans several major fields including calculations of the properties of bulk materials and surfaces; thin film semiconductors and electronic materials, photonic crystals, subwavelength arrays, electromagnetic simulations, sensors and atomistic modeling of microelectronic processes.
His current research at the MRC includes:
1. Photonics. Design and simulation of photonic band gap crystals. Electromagnetic simulations and wave propagation in photonic crystals. Development of novel electromagnetic applications in the microwave, millimeter-wave, infrared and optical frequencies utilizing photonic crystals (theory and experiment). Nanostructured materials and ceramics for nano-photonics applications.
2. Microelectronics/Semiconductors. Simulation of the structure, metastability, light-induced defects and hydrogen motion in solar cell materials and devices. Amorphous silicon and nanocrystalline materials for renewable energy applications. Strained silicon substrates for CMOS devices. Semiconductor process modeling and regrowth of amorphized layers in silicon processes. Molecular dynamics simulations at the nanoscale.
3. Sensors. High-sensitivity miniaturized on-chip plasmonic MEMS sensors for detection of gases and toxic agents. Applications development with industrial collaborators. Directional antennas and receivers. Finite-difference-time-domain simulations. Design of infrared sources and emitters using periodic crystals. Scattering matrix formulations.
4. Nanoscale Phenomena. Modeling matter and processes at the nanoscale with atomistic-level simulations. Use of parallel-computing methodologies. Chemical-mechanical planarization. Chemical sensors from nano-memebranes and micro-cantilevers.
Publications and Students
Students and Postdoctoral Associates
Amorphous and Nano-crystalline Silicon Thin Films: Science and Technology- 2004. Materials Research Society Proceedings Volume 808 (2004).
Editors: G. Ganguly, M. Kondo, E. Schiff, R. Carius, R. Biswas
Amorphous and Nano-crystalline Silicon Thin Films: Science and Technology- 2005. Materials Research Society Proceedings Volume 862 (2005).
Editors: P. C. Taylor, M. Kondo, R. Carius, R. Biswas, R. Collins.
Ames Lab Press release on add drop filters using photonics crystals. http://www.ameslab.gov/final/News/2008rel/Add-drop_filter.html
1. Awarded U.S. Patent 5,406,573. April 11, 1995, Periodic dielectric structure for production of photonic band gap and method for fabricating the same E. Ozbay, G. Tuttle, E. Michel, K.M. Ho, R. Biswas, C.T. Chan, and C.M. Soukoulis.
2. Awarded U.S. Patent 06339030. January, 2002 Method for fabricating photonic band gap crystals using ceramic processing techniques K. Constant, G. Subramania, R. Biswas, K.-M. Ho, Originally filed 12/2000.
3. Awarded U.S. Patent 6,593,894 July 15, 2003; Highly directional Antennas using photonic band gap crystals R. Biswas, E. Ozbay, B. Temelkuran, M. Sigalas, G. Tuttle, K.M. Ho: full patent filed 9/26/2001.
4. Record of invention: Design of Photonic band gap structures with higher gaps R. Biswas, K.-M. Ho, filed Nov-22-1996, No AL409, ISURF #02216I.
Ames Lab "Solar
Dr. Biswas's Ames Lab web page
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Revised: August 12, 2005