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Miami University
Dr. S. Burcin Bayram

Assistant Professor
Department of Physics
Phone: 513-529-5630
Fax: 513-529-5629
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Dr. S. Burcin Bayram
Dr. S. Burcin Bayram "My research focuses on the polarization of light, emitted from atomic states, that provides a key to the understanding of atomic/molecular collision processes. The collisional-based spectroscopic investigations are important in nanotechnology for the plasma processing of semiconductor devices, and yield significant information for understanding process involving energy transfer through gases."


Description of Research
Nanotechnology has created new exciting scientific research opportunities in the high performance of the semiconductor devices. For example, electron collision cross section data for gases are important knowledge in the plasma processing of microelectronic products. Since plasma-based process damage becomes a serious concern when the size of the microelectronic devices and circuits shrink, the electron interactions with plasma processing such as etching and deposition play a critical role in the performance of such devices. Therefore, the electron-collision cross section and electron transport coefficients for gases are important quantities in nanotechnology. My experimental research studies focuses on the collisional dynamics between alkali atoms and noble-gas atoms through polarization spectroscopy. The polarization of light emitted from atomic states provides an efficient key to the understanding of many atomic and molecular collision processes. Also, the collisional based spectroscopic investigations yield significant information for understanding the process involving energy transfer through gases which is the essence of atmospheric and plasma processes, combustion diagnostics, and gas phase chemistry. We use a two-photon pulsed pump-probe laser technique. A pulsed pump laser excites an ensemble of atoms/molecules while inducing an anisotropy in the excited state, and a second pulsed probe laser promotes these atoms to a final state and senses induced anisotropy in the excited state. The polarization of the emitted light reveals significant information about the anisotropy and the collisional dynamics in the excited state. Our experiments use a Nd:YAG pulsed laser which pumps two dye lasers to create a pump-probe sequence. A schematic of our experiment is shown below.

Undergraduate researcher's roles in your lab
Undergraduate researchers involve with low light detection systems, optics, lasers, high vacuum technology, electronics, data acquisition, software programs, remote controlling of various devices.

Graduate student's role in your lab
Graduate students are involved with data taking process, constructing external cavity solid state/dye lasers, systematic error analysis, electronics and optics.

Presentations

"Design and analysis of a passively stabilized high-power narrow-bandwidth and widely tunable external cavity broad-area laser," R. Coons*, Brian Sands*, and S.B. Bayram, SPIE Great Lakes Photonics Symposium, Dayton, Ohio, June 12-16, 2006.

"Collisional depolarization of Zeeman coherences in the 133Cs 6p2P3/2 level with argon molecules: Two-photon Polarization Spectroscopy", S. B. Bayram, R. Marhatta*, International Symposium on Molecular Spectroscopy, 61st Meeting, Ohio State University, Columbus, Ohio, June 19-23, 2006.

"Collisional depolarization of the atomic Cs-6S-10S transition with argon buffer gas", Seda Kin*, Morgan Welsh, and S. Burcin Bayram, APS, 36th Meeting of the Division of Atomic, Molecular and Optical Physics, Lincoln, Nebraska, May 2005.

"Narrow-linewidth operation of high power broad-area laser diodes using a passively stabilized variable external cavity design," Brian L. Sands* and S. Burcin Bayram, APS, 36th Meeting of the Division of Atomic, Molecular and Optical Physics, Lincoln, Nebraska, May 2005.

"Matrix-element spectroscopy of the 5S-5P transition in atomic rubidium," S.B. Bayram, A. Sieradzan, M.D. Havey, M.S. Safronova, APS, 36th Meeting of the Division of Atomic, Molecular and Optical Physics, Lincoln, Nebraska, May 2005.

"Polarization Spectroscopy", SPIE Conference, Quantum Optics and Advanced Spectroscopy, S.B. Bayram, Invited talk, Cleveland, Ohio, June 2004.

Funding
$100.000 Grant from the State of Ohio
Nanomaterials in our Environment

$100.000 Grant from the State of Ohio
Nanomaterials in our Environment
Publications

S.B. Bayram, M.D. Havey, M.S. Safronova, A. Sieradzan, J. Phys. B: At. Mol. Opt. Phys. 39, 1-16 (2006)

S.B. Bayram, S. Kin*, M.J. Welsh, J.D. Hinkle, Phys. Rev. A 73, 042713 (2006)

S.B. Bayram and T.E. Chupp, Rev. Sci. Instrum. 73, 4169-4171 (2002).

A. Markhotok, S.B. Bayram, A. Sieradzan, and M.D.Havey. J. Appl. Phys. 92, 1613 (2002).

G. Williams*, S.B. Bayram, S.C. Rand, T.Hinklin, R.M. Laine, Phys. Rev. A 65, 013807 (2002).

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