Phone: (515)-294-6987
Fax: (515)-294-0689
Email: biswasr@ameslab.gov
B. Sc. 1976, Bombay University; M. Sc. 1978, Indian Institute of Technology, Bombay; M. S. 1982, Ph. D. 1984, Cornell University; 1984-86 Postdoctoral Member of Technical Staff, AT&T Bell Laboratories, Murray Hill, NJ; 1986-88, Consultant, Exxon Research; Ames Laboratory/Iowa State University, 1986-present.
RESEARCH INTERESTS
Molecular dynamics and electronic structure calculations of semiconductor and nanoscale materials. Structure and light-induced properties of amorphous silicon materials, for photovoltaic applications. Simulations of growth processes. Photonic band structure calculations and design of photonic band gap crystals. Novel applications of photonic band gap materials including antennas and millimeter wave devices.
SELECTED PUBLICATIONS
W. Leung, G, Tuttle, M.M. Sigalas, R. Biswas, C.M. Soukoulis, and K.M. Ho, “High-Q defects in metallic photonic band gap crystals,” J. of Applied Physics 84, 4091 (1998).
M. Sigalas, R. Biswas, K.-M. Ho, W. Leung, G. Tuttle, and D. Crouch, “Effect of photonic band gap crystals on dipole antennas,” Electromagnetics 19, no. 3, 291 (1999). (special issue, invited paper)
M.M. Sigalas, R. Biswas, G. Tuttle, C.M. Soukoulis, and K.M. Ho, “ Photonic Crystals,” chapter in Wiley Encyclopedia of Electrical and Electronic Engineering 16, 345 (John Wiley, 1999).
G. Subramania, K. Constant, R. Biswas, M.M. Sigalas, K.-M. Ho, “Optical Photonic crystals fabricated from colloidal systems,” Appl. Phys. Lett. 74, 3933 (1999).
S. Lin, J. Fleming, M.M. Sigalas, R. Biswas, and K.-M. Ho, “in Photonic band gap Microcavity in three dimensions,” Phys. Rev. B. 59, 15579 (1999) Rapid Communications.
M.M. Sigalas, R. Biswas, K.-M. Ho, C.M. Soukoulis, and D.D. Crouch, “Waveguides in three-dimensional metallic photonic band gap materials,” Phys. Rev. B 60, 4426 (1999).
M.M. Sigalas, R. Biswas, K.-M. Ho, C.M. Soukoulis, D. Turner, B. Vasiliu, S.C. Kothari, and Shawn Lin, “Waveguide bends in three-dimensional layer-by-layer photonic band gap materials,” Microwave and Opt. Tech. Lett. 23, 57 (1999).
M. M. Sigalas, C. M. Soukoulis, C. T. Chan, R. Biswas, and K. M. Ho, "The Effects of Disorder on Photonic Band Gaps,” Phys. Rev. B 59, 12767 (1999).
G. Subramania, K. Constant, R. Biswas, M.M. Sigalas, and K.-M. Ho, “Optical Photonic crystals fabricated from colloidal systems,” J. of Lightwave Technology 17, 1970 (1999). (IEEE/OSA Publications, Nov-99).
I. El-Kady, M.M. Sigalas, R. Biswas, and K.-M. Ho, “Waveguides in two-dimensional photonic bandgap materials,” J. of Lightwave Technology 17, 2042 (1999).
R. Biswas, and Y.P. Li, “H-flip model of light induced changes of amorphous silicon,” Phys. Rev. Lett. 82, 2512 (1999).
R. Biswas, and Y.P. Li, “H-flip model for metastable structural changes of amorphous silicon,” Materials Research Society Symp. Proc. 557, 371 (1999).
B. Temelkuran, M. Bayindir, E. Ozbay, R. Biswas, G. Tuttle, M.M. Sigalas, and K-M. Ho, “Photonic crystal based resonant antenna with a very high directivity,” J. of Applied Physics 87, 603 (2000).
R. Biswas, M.M. Sigalas, G. Subramania, C.M. Soukoulis, and K.M. Ho, “Photonic band gaps of porous solids, Physical Review B 61, 4549 (2000).
I. El-Kady, M.M. Sigalas, R. Biswas, C.M. Soukoulis, K.M. Ho, “Photonic band gaps in three-dimensional metallic lattices,” Phys. Rev. B 62, 15299 (2000).
“Photonic Crystals,” M. M. Sigalas, K. M. Ho, R. Biswas, C. M. Soukoulis, in Optics of Nano Structured Materials, pp. 1-38, Edited by V. A. Markel and T. F. George, (John Wiley and Sons, New York, 2000).
“Narrow band emission from lithographically defined photonic bandgap structures in silicon: matching theory and experiment” A. C. Greenwald, J. T. Daly, E. A. Johnson, B. Kinkade, M. McNeal, M. Pralle, and N. Moelders, T. George and D. S. Choi, R. Biswas and I. El-Kady. (MRS Fall 2000, Symposium E on Microphotonics- Materials, Physics and Applications) vol. 637.
R. Biswas and Y.-P. Li, “Metastability in amorphous silicon from hydrogen flips,” J. Non-Crystalline Solids 266-269, 401 (2000). (ICAMS 18 special issue).
R.Biswas, Y.P. Li and B.C. Pan, “Isotopic effect between hydrogen and deuterium emission in silicon,” J. Non-Crystalline Solids 266-269, 176 (2000).
R. Biswas, Y.-P. Li, and B.C. Pan, “Mechanisms of metastability in hydrogenated amorphous silicon,” Invited paper, Proc. MRS 609, A3.5.1 (2000), Invited paper.
G. Subramania, K. Constant, R. Biswas, M.M. Sigalas, K.-M. Ho, “Synthesis of thin film photonic crystals,” Synthetic Metals 116, 445-448 (2001).
G. Subramania, K. Constant, R. Biswas, M.M. Sigalas, K.-M. Ho, “Inverse face-centered cubic thin film photonic crystals,” Advanced Materials 13, 443 (2001).
S. Lin, P. Fleming, M.M. Sigalas, R. Biswas, and K. -M. Ho, “A complete three-dimensional photonic band gap in a simple cubic system,” J. Optical Society of America B 18, 32 (2001).
Mehmet Bayindir, E. Ozbay, B. Temelkuran, M. M. Sigalas, C. M. Soukoulis, R. Biswas, K. M. Ho, “Guiding, bending, and splitting of electromagnetic waves in highly confined photonic crystal waveguides” , Phys. Rev. B 63, 081107(R) (2001)
“The structure of optical photonic crystals,” R. Biswas, G. Subramania, K. Constant, M.M. Sigalas, K.-M. Ho, Proceedings NATO Advanced Study Institute on Photonic Crystals and Light Localization, ed. C. M. Soukoulis. (Kluwer, 2001).
Exceptionally directional sources with photonic band gap crystals, R. Biswas, E. Ozbay, B. Temelkuran, M. Bayindir, M. M. Sigalas , and K.-M. Ho, Proceedings NATO Advanced Study Institute on Photonic Crystals and Light Localization, ed. C. M. Soukoulis. (Kluwer, 2001)
A. Zakhidov, R. H. Baughman, I. I. Khayrullin, I. Udod. M. Kozlov, N. Eradat, V. Vardeny, M. Sigalas, and R. Biswas, “Three-dimensionally periodic conductive nanostructures: network vs cermet topologies for metallic photonic band gaps,” Synthetic Metals 116, (in press) (2001).
Structural characterization of thin film photonic crystals,” G. Subramania, R. Biswas, K. Constant, M. .M. Sigalas, K.-M. Ho, Phys. Rev. B 63, (2001) (in press).
Amorphous Semiconductors
R. Biswas, and Y.P. Li, H-flip model of light induced changes of amorphous silicon, Phys. Rev. Letters 82, 2512 (1999).
R. Biswas, Y.-P. Li, B.C. Pan Enhanced stability of deuterium in silicon, Appl. Phys. Lett. 72, 3500 (1998).
R. Biswas, B.C. Pan Microsopic nature of Staebler-Wronski defect formation in amorphous silicon, Appl. Phys. Lett. 72, 371 (1998).
R. Biswas, Q. Li, B.C. Pan, Y. Yoon, Mechanism for hydrogen diffusion in amorphous silicon, Phys. Rev. B. 57, 2253 (1998).
Photonics
R. Biswas, M.M. Sigalas, G. Subramania, C.M. Soukoulis, and K.M. Ho, Photonic band gaps of porous solids, Physical Review B 61, (Feb-15-2000).
B. Temelkuran, M. Bayindir, E. Ozbay, R. Biswas, G. Tuttle, M.M. Sigalas, and K-M. Ho, Photonic crystal based resonant antenna with a very high directivity, Journal of Applied Physics 87, 603 (2000).
G. Subramania, K. Constant, R. Biswas, M.M. Sigalas, K.-M. Ho, Optical photonic crystals fabricated from colloidal systems, Appl. Phys. Lett. 74, 3933 (1999).
S. Lin, J. Fleming, M.M. Sigalas, R. Biswas, K.-M. Ho, In Photonic band gap microcavity in three dimensions, Phys. Rev. B. 59, 15579 (1999) Rapid Communications.
S. Lin, J.G. Fleming, D.L. Hetherington, B.K. Smith, R. Biswas, K.-M. Ho., M.M. Sigalas, W. Zubrzycki, S.R. Kurtz, J. Bur A three-dimensional photonic crystal operating at infrared wavelengths, Nature 394, 251 (1998).
R. Biswas, M.M. Sigalas, G. Subramania, K.-M. Ho Photonic band gaps in colloidal systems, Phys. Rev. B 57, 3701 (1998).