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Dr. David Klotzkin Associate Professor The University of Cincinnati Department of Electrical & Computer Engineering and Computer Science PO Box 210030 Cincinnati, OH 45221-0030 Office: 811L Rhodes Hall Lab: 907 Rhodes Hall Email: David.Klotzkin at domain name uc.edu
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Professor Klotzkin's research interests are in the field of optoelectronics, particularly active photonic devices, including:
High speed telecommunications lasers
Integrated opto-electronic devices
Quantum dot lasers and laser dynamics
Photonic-band-gap based devices
Organic luminescent devices
Microfluorescence detectors
Some Prior Work:
A green organic luminescent device based on organic molecular transitions. |
A red organic luminescent device based on atomic rare-earth emission. |
 Simulation of a combination of a conventional waveguide with a PBG mirror for small area, low loss mirrors. |
 Patterned Bragg reflector/conventional waveguide interface
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 A 10Gb/s eye pattern from an integrated spot-size-converted laser demonstrating a wide open eye.
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 A cross-sectional SEM of an integrated, directly modulated, distributed telecommunications laser with a spot-size converter showing a) junction between active and spot-size-converter region, b) back-facet side, and c) front-facet side
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 Polarizer grid array made with interference lithography on a 50micron scale illuminated with polarized 1.55micron light. Left, light perpendicular to one of the principle axes; right, light polarized at 45 degree angle to both. Click for movie of polarizer grid array being rotated under illumination |
(Pictured October 2007.) |
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Past Thesis' or Dissertations
| Name | Defense | Dissertation Title |
| Siddhartha Banerjee | November 2004 | Optical Properties and Population Statistics of Erbium in Optically-pumped Erbium-doped Zinc Silicate Germanate Waveguide Amplifiers |
| Ajit Balagopal | March 2005 | Epoxyless Fiber to Submount Field Assisted Bonding for Optoelectronics Applications |
| Ashwin Chincholi | May 2005 | Parallel Fabrication of Photonic Crystals With Interference Lithography |
| Hui Shen | July 2005 | Design and Simulation of a Wavelength Division Multiplexer Using Photonic Crystal Filters |
| Rajasundarem Rajasekram | July 2006 | |
| Haichuan Mu (Ph.D.) | August 2006 | Carriers Injection and Transport in Small Molecule Organic Light Emitting Diodes (Oled) |
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ECECS 481 Solid State Electronics I (Fall 2006, 2008) 3 Credits, 3hr lecture/week. Course Objective: Learn the basic physics which governs semiconductor devices. Topics include semiconductor crystal structure, energy band gap, electron and hole charge carriers, mobility, doping and carrier densities, Fermi level, generation and recombination, physics of p-n junction and Schottky diodes. Study of semiconductor materials and their properties, p-n junctions and Schottky diodes as a basis for understanding the operation of modern transistors in integrated circuits. Textbook Streetman and Banerjee, Solid State Electronic Devices, Prentice Hall, 2000. Detailed information about the course for the Fall 2006 session will be available on the University of Cincinnati Blackboard web site after late September, at blackboard.uc.edu .
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ECECS 614 Photonics Information Processing (Winter 2006) 3 Credits, approximately 6 laboratory hours/week Course Objective: Explore the fundamentals of photonic systems through the analysis and characterization of optical and optoelectronic components. This 10 week lab course is divided into three modules. Module 1 is designed to explore the fundamentals of both free space (standard bulk) optics and fiber optics. Experiments in this phase are geared toward 1) understanding the characteristics of optical and optoelectronic components 2) developing the skills necessary to set up photonic information processing systems. Modules 2 and 3 are geared towards the exploration of advanced level topics. Experiments in these modules are designed to demonstrate the concepts of photonic information processing through the construction and demonstration of several application oriented systems. Textbook Laboratory Manual and Instructor Handouts. Reference: Reference Bahaa E.A. Saleh and Malvin Carl Teich, Fundamentals of Photonics, Wiley, 1991. D. C. O’Shea, Elements of Modern Optical Design, John Wiley and Sons, 1985. E. Hecht, Optics, Addison-Wesley Publishing Company, 1987.
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ECECS 784 Advanced Semiconductor Lasers (Spring 2007, 2008) 3 Credits, 3 hr. lecture/week with occasional demonstrations. Course Objective: Learn the physics of semiconductor lasers and their theory of operation, as well as the device engineering, structure and performance characteristics of standard semiconductor laser structures, including advanced and tunable optoelectronic transmitters. The first half of this course covers the physics of semiconductor lasers, starting with a review of p-n junction theory. From a rate equation model, external DC and dynamic characteristics will be related to intrinsic parameters. The influence of cavity characteristics (such as facet coatings, length, and optical loss) on laser operation will be determined. The second part will cover different laser and transmitter structures and the particular physics relevant to each, such as distributed feedback lasers (coupling, gain margin, single mode operation and implications for laser transmission), vertical cavity surface emitting lasers, distributed Bragg reflectors, and electro-absorption modulators and semiconductor-based interference-based modulators.
Textbook: P. Bhattacharya, Semiconductor Optoelectronic Devices, Prentice Hall, 1997.
Reference G. Agrawal, Fiber-Optic Communications Systems, Wiley Interscience, 2002. B. Saleh, M. Teich. Fundamentals of Photonics, Wiley Interscience, 2002.
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ECECS 251 Network Analysis II (Winter 2007, 2008 4 Credits, 4 hr. lecture/week with occasional demonstrations. Course Objective: Solutions of linear electrical networks containing inductors and capacitors; phasors; transient and steady-state frequency analysis; AC power circuits; Laplace transforms; frequency response; magnetically coupled circuits.
Textbook: Hayt and Kemmerly, Engineering Circuit Analysis, 6th or 7th. Ed. McGraw Hill, 2002
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