PROFESSIONAL EXPERIENCE

Transcription

1 Dr. Gökhan Özgür Assistant Professor Department of Electrical and Electronics Engineering Meliksah University Talas, Kayseri, TURKEY Phone: +90 (352) Fax: +90 (352) PROFESSIONAL EXPERIENCE Assistant Professor Department of Electrical and Electronics Engineering Meliksah University Talas, Kayseri, TURKEY February 2, 2010 Present Currently running the TÜBİTAK CAREER project, entitled Low-loss Integrated Waveguide Optical Isolator. This is a 3-year project ( ) and the support is TL (~$ ). Research includes electromagnetic waveguide modeling of optical isolators and development of computational software to perform simulation of the devices. It also includes material growth, formation of nano-composites, device design and optimization. The photonic devices will be fabricated in the cleanroom and tested in Dr. Özgür s lab. Research Scientist Supervisor Dr. Dennis Deppe, FPCE Nanophotonics Chair University of Central Florida, the College of Optics & Photonics 4000 Central Florida Blvd., Orlando, FL December 12, 2005 January 29, 2010 Achievements: - Demonstrated the lowest threshold current density of 8.8 A/cm 2 that has ever been achieved at room temperature for a laser diode. - Reported the internal loss of ~0.25 cm 1, which is among the lowest ever reported for room temperature CW operation of a laser diode. - First demonstration of monolithic mode-locking in a single layer quantum-dot laser, demonstrating a unique modal pattern from a 40-μm stripe width at a 3.75 GHz modelocked repetition rate. - Demonstrated all-epitaxially grown high-power vertical cavity surface emitting lasers operating at 980 nm. Research: Characterize gallium-arsenide based material systems for light sources using optical techniques including photoluminescence measurements. Responsible for characterization equipment including laser diode drivers, optical and electrical test instruments, infrared cameras and detectors. Fabricate, characterize, model and test of high-power high- 1

2 efficiency quantum-dot edge-emitting lasers and other new types of high-power laser diodes. Design of all-epitaxial high-efficiency vertical-cavity surface-emitting lasers (VCSELs) and resonant-cavity light emitting diodes (RCLEDs). Research on novel quantum-dot lasers with increased efficiency, reduced power requirements, and increased speed of operation. Theoretical study and modeling on the dynamic properties of novel semiconductor light sources, such as gain characteristics, threshold temperature dependence, modulation characteristics, relative intensity noise and linewidth enhancement factor. Projects include compact quantum-dot mode-locked lasers, optical pumping modules for solid state and fiber lasers, light sources for microdisplay chips, and high power and high efficiency laser diode technologies, which are immediately needed and crucial for a wide range of telecommunications, industry and military applications. Projects: - High Power, High Efficiency, Laser Diode Technologies, Defense Advanced Research Project Agency, 11/01/05 10/31/08. - Compact Quantum Dot Mode-Locked Lasers for Arbitrary Waveform Generation, Air Force Research Laboratory, 05/01/07 02/29/08. - Pump Laser Diode Module, Air Force Research Laboratory, 01/12/07 10/12/08. - Microdisplay Chip for Virtual Reality Headsets, National Science Foundation, 01/01/07 12/31/08. - New Types of Mid/Far-Infrared Semiconductor Lasers for CW Room-Temperature Operation, Texas A&M Research Foundation, 11/16/06 05/31/08. - Epitaxial Growth of Quantum Dots for High Coherence Photonic Crystal Devices, National Science Foundation, 06/01/06 05/31/09. - High density beam combining by volume Bragg gratings in PTR glass, HEL JTO (High Energy Lasers Joint Technology Organization, DoD), 04/01/06 03/31/08. - Intralaser Wave-Mixing Technology for Room-Temperature CW Mid/Far-Infrared Semiconductor Sources, Texas A&M Research Foundation, 12/15/05 01/15/09. - InP-Based Mid-Infrared Quantum Dot Cascade Lasers, Army Research Office, 12/01/05 11/31/ μm Quantum Dot Laser Development for High Coherence, High Power Applications, Space and Naval Warfare, US Navy laboratory, 12/01/05 11/30/06. Postdoctoral Fellow Supervisor Dr. Dennis Deppe, Professor of Electrical Engineering The University of Texas at Austin, Microelectronic Research Center JJ Pickle Research Center, Burnet Road, Austin, TX September 1, 2005 November 30, 2005 Worked on design, fabrication and characterization of high-reflective dielectric mirrors for semiconductor laser facet coating. Fabrication and test of high-power edge-emitting quantum-dot semiconductor lasers. 2

3 Research Assistant Supervisor Dr. Gary Evans, Professor of Electrical Engineering Southern Methodist University, Department of Electrical Engineering 3145 Dyer Street, Dallas, TX August 15, 2001 August 15, 2005 Worked on design, fabrication, testing, packaging and characterization of semiconductor lasers. Designed, fabricated and tested semiconductor optical isolators monolithically integrated with indium-phosphide-based semiconductor lasers (Project was supported by Army.) Built coupling experiment test station and tested waveguide devices. Designed integrated optical isolators for polymer/glass waveguides applicable to optical fibers. Designed effective and efficient diffraction Brag reflectors applicable to DBR and Grating-out-coupled Surface-Emitting (GSE) lasers, and photonic integrated circuits. Involved in projects on GSE Lasers and Grating-Assisted Coupling of Light Between Semiconductor and Glass Waveguides. Worked on testing surface emitting lasers, diffraction grating fabrication, polymer waveguide fabrication and development of photonics software manuals. Fabricated and tested MOSFET transistors. Helped extensively prepare four research grant proposals submitted to NASA, DoD, and NSF. Summer Intern Supervisor Taha Masood, Director of Engineering Photodigm Inc E. Collins Blvd., Ste. 200, Richardson, TX May 15, 2002 August 15, 2002 Designed 1550-nm TM-mode ridge guide lasers with multi-quantum wells and integrated optical isolators. Designed mask sets for fabrication. Research Assistant Supervisor Dr. Erkan Imal, Chair of Electronics Engineering Fatih University, Department of Electronics Engineering Buyukcekmece, Istanbul, Turkey October 1999 July 2001 Research on Optical Fiber Communications. Conducted Electronics Labs and Microprocessor Labs. Worked on 8088 Intel Processor and peripherals. Project on Speech Signal Processing: Speech Synthesis with Linear Predictive Coding technique. Seminar on Optical Fiber Communications: Transmission beyond 10 Gbps. Taught Microsoft Office. Lecturer Ataturk Alatoo University, Department of Computer Engineering Gorkiy Street, Microregion Tunguch, Bishkek, Kyrgyzstan September 1997 May 1999 Taught undergraduate courses: Calculus I and II, Physics (Mechanics, Electricity and Magnetism), Electric Circuits, Digital Electronics and Computer Applications. 3

4 EDUCATION PhD in Electrical Engineering School of Engineering, Southern Methodist University, Dallas, Texas, December MS in Electronic Engineering The Graduate Institute of Sciences and Engineering, Fatih University, Istanbul, Turkey, July BS in Electrical and Electronic Engineering, The Middle East Technical University, Ankara, Turkey, June JOURNAL PUBLICATIONS G. Ozgur, A. Demir, and D. G. Deppe, "Threshold temperature dependence of a quantum dot laser diode with and without p-doping," IEEE Journal of Quantum Electronics, vol. 45, no. 10, pp , October D. G. Deppe, K. Shavritranuruk, G. Ozgur, H. Chen, and S. Freisem, Quantum dot laser diode with low threshold and low internal loss, Electronics Letters, vol. 45, no. 1, pp , 1 January S. Freisem, G. Ozgur, K. Shavritranuruk, H. Chen, and D. G. Deppe: "Very-lowthreshold current density continuous-wave quantum-dot laser diode", Electronics Letters, vol. 44, no. 11, pp , 22 May J. M. Hammer, G. Ozgur, G. A. Evans, and J. K. Butler, Integratable 40 db optical waveguide isolators using a resonant-layer effect, Journal of Applied Physics, vol. 100, no. 10, , 28 November J. M. Hammer, G. A. Evans, G. Ozgur, and J. K. Butler, Isolators, polarizers, and other optical waveguide devices using a resonant-layer effect, IEEE Journal of Lightwave Technology, vol. 22, no. 7, pp , July CONFERENCE PROCEEDINGS - PRESENTATIONS G. Ozgur, A. Demir, and D. G. Deppe, "Transparency current influence on the temperature dependent threshold of undoped and p-doped QD laser diodes," The 22nd Annual Meeting of the IEEE Photonics Society (formerly LEOS), 4-8 October 2009, Belek-Antalya, Turkey, p. ThP2. A. Demir, G. Ozgur, K Shavitranuruk, S. Freisem and D. G. Deppe, Threshold and temperature dependence of quantum dot laser diodes approaching ideal performance, CLEO 2009: The 29th Conference on Lasers and Electro Optics, May 31 - June 5, 2009, Baltimore, MA, p. CMV5. 4

5 H. Pattanaik, G. Zhao, G. Ozgur, A. Demir, and D. G. Deppe, Alpha-factor in above threshold operation of 1.3um QD laser diode, Photonics 2008: International Conference on Fiber and Photonics, December 13-17, 2008, New Delhi, India. K Shavitranuruk, J. Kim, S. Freisem, G. Ozgur, H. Chen, D. G. Deppe, A. Ardey, and P. Delfyett, Large Cavity Single Layer Quantum Dot Laser Diodes, IEEE/LEOS 2008: The 21st Annual Meeting of the IEEE Lasers & Electro-Optics Society, 9-13 November 2008, Newport Beach, CA, pp D. G. Deppe, S. Freisem, G. Ozgur, K. Shaviritranuruk, and H. Chen, Very Low Threshold Current Density Continuous Wave Quantum Dot Laser Diode, SLC 2008: The 21st IEEE International Semiconductor Laser Conference, September, 2008, Sorrento, Italy. Deppe, D. G.; Freisem, S.; Chen, H.; Ozgur, G.; Demir, A.; Muller, A.; Shin, C.K., Nanophotonic Lasers and Spontaneous Light Sources: Scaling Trends for Speed, Efficiency, and Quantum Light Generation Using Single Quantum Dots, i-now '07: International Nano-Optoelectronics Workshop, 2007, July 29 - August 11, 2007, Beijing and Lanzhou, China, Page(s): 3-3. G. Ozgur, J. M. Hammer, T. Masood, J. B. Kirk, J. K. Butler, G. A. Evans, Integrated photonic devices using a novel resonant-layer effect concept, IEEE/LEOS 16th Annual Workshop Interconnections within High-Speed Digital Systems, May , Santa Fe, New Mexico. G. Ozgur, G. A. Evans, Characterization and optical properties of Fe nanoparticles embedded in an InGaAsP semiconductor matrix for photonic applications, American Society of Materials First North Texas Materials Symposium, April , Arlington, Texas. G. Ozgur, G. A. Evans, Oscillation immune semiconductor optical amplifier, Metroplex Research Consortium Electronics Devices and Materials, April , Fort Worth, Texas. S. Selmic, G. Ozgur, Z. Hilali, AlGaInAs and InGaAsP tapered lasers, Metroplex Research Consortium Electronics Devices and Materials, April , Arlington, Texas. Imal, E., Ali-zada, P., Ozgur, G., Mamedov, H., Ali-zada, C., "The Experience of a Mechatronic Electrodynamic Modeling System Application for Oil Industry Main Electric Drives Design", The Second International Conference on System Identification and Control Problems (SICPRO 03), pp , January , Moscow, Russia. 5

6 THESES G. Ozgur, PhD Thesis: Optical isolators monolithically integrated with semiconductor lasers and other photonic devices, Southern Methodist University, Dallas, Texas, August 1, G. Ozgur, MS Thesis: The effects of fiber impairments on WDM optical communication systems, Fatih University, Istanbul, Turkey, July 30,