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Watt's Up College of Optical Sciences News for September 27, 2007
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Today -- Optical Sciences Colloquium -- 3:30 p.m. -- Meinel 307
Stephen Goodnick of Arizona State University will present Simulation of Ultrafast Phenomenon in Semiconductor Nanostructures. Abstract: In the present talk, we discuss the use of Ensemble Monte Carlo (EMC) techniques for the simulation of ultrafast phenomena in semiconductor nanostructures and devices. EMC is essentially a direct solution of the semi-classical Boltzmann transport equation (BTE), which can be extended to account for various quantum mechanical and many body effects beyond the BTE framework. We first discuss the application of this simulation method to carrier relaxation during ultrafast photoexcitation in GaAs quantum confined systems, in particular the role of intercarrier scattering and non-equilibrium phonons in intersubband relaxation.
We then discuss the simulation of transport in GaN and AlGaN heterostructures using a full-band Cellular Monte Carlo simulator developed by our group [1]. The electronic band structure and phonon spectra are used as direct inputs to the simulator for both cubic, hexagonal, and strained crystal structures using both empirical and ab initio methods. The full anisotropic electron-phonon interaction is calculated from the rigid-ion model using the electronic structure, the atomic pseudopotential, and the full phonon dispersion and eigenvectors for both acoustic and optical modes. Good agreement is obtained between the simulated results, and experimental pulse I-V measurements of high field transport measured in-house [2. The role of nonequilibrium hot phonons in limiting the frequency response of heterostructure field effect devices is also discussed.
Finally, we discuss the simulation of terahertz emission during ultrafast optical excitation in pin diode structure using the CMC code, and comparison to experimental studies by Leitensdorfer et al. [3]. Here good agreement is obtained between the experimentally observed temporal evolution of the terahertz pulse and the non-stationary dynamics of photoexcited electrons and holes at various DC field strengths. For these simulations, and for high frequency and electro-optic devices in general, we have also coupled the CMC simulator with finite difference time domain (FDTD) solutions of Maxwell’s equations, and applied it to simulate terahertz pulse generation directly during electro-optic sampling.
[1] M. Saraniti and S. M. Goodnick, IEEE Trans. Elec. Dev. 47 (2000) 1909. [2] J. M. Barker et al., Physica B314 (2002) 39. [3] A. Leitenstorfer, S. Hunsche, J. Shah, M.C. Nuss, and W.H. Knox: Phys. Rev. Lett. 82 5140 (1999).
Nasser Peyghambarian is the host.
Harnessing Attosecond Science in the Quest for Coherent X-Rays
On Friday, October 5, Dr. Margaret M. Murname will present a Special Physics Colloquium at the College of Optical Sciences in Meinel 307. Pierre Meystre is the sponsor and the contact is Dotti Sherwood: sherwood@physics.arizona.edu.
Please note that Dr. Murname is also scheduled to present a Special Lecture in the Kiva Room at the Student Union on October 4.
You are Invited to Join OSC's Soccer Team
If interested, contact Brian Myer (myer@optics.arizona.edu) and read below.
We meet weekly, on Wednesday afternoons, on the grassy area in front of the Meinel Building. Our typical meeting point is the field in front of the Tennis Courts, which is the North West corner of University Boulevard and Campbell Avenue. Look for players wearing yellow shirts.
For those who would like to play some mildly competitive games, our team will compete in the UA Intramurals soccer league, beginning the week of October 21. There is no requirement to be male to join the team. If you want to play, just come to the practice time.
So, bring some spare clothes and soccer shoes and keep them by your desk and come out to play next week.
Register Now for IdeaFunding 2007 Resources for the Southern Arizona Entrepreneur
The Tucson and Southern Arizona business communities are invited to attend IdeaFunding 2007: Resources for the Southern Arizona Entrepreneur, presented in community partnership by members of the region's business and academic communities.
A workshop for entrepreneurial success, Resources for the Southern Arizona Entrepreneur is a day-long workshop focusing on the vast range of resources and services available to new and emergent entrepreneurs and business leaders seeking to build and expand their business.
Although the Southern Arizona region is rich with both longstanding and emerging services for business growth, it can be challenging to find the right solution for the business need. Join IdeaFunding 2007 and get the inside track on where to go for almost any business need.
The date is November 1, 2007 and the place is Tucson's beautiful and historic Manning House.
For details, maps, and registration information, please visit the IdeaFunding Web site at http://www.ideafunding.org/index.asp
Happy Birthday
October 1
October 2
October 3
October 4
October 5
October 6
On Campus
September 27, 2007 -- AME Seminar -- 4:00 p.m. -- AME S212 Mr. Manabendra Das, AME PhD candidate at the University of Arizona, will present Rotorcraft Aeroelasticity using Three Dimensional Flexible Multibody Analyses.
September 28, 2007 -- Physics Colloquium -- 2:30 and 3:00 p.m. -- PAS 218 Physics graduate student Anne Murdaugh will present From Lab to Legislation at 2:30 p.m. Professor Feryal Ozel, University of Arizona Department of Physics, will present Peeking into a Neutron Star: Neutrons, Condensates, or Quarks? at 3:00 p.m.
October 1, 2007 -- BME Seminar -- 2:00 p.m. -- Keating 103 Evan Unger, MD and FACR, Professor of Radiology and Bioengineering at the University of Arizona, will present Microbubble-Enhanced Sonothrombolysis, From Benchtop to Multi-Center Clinical Trials for Stroke. Urs Utzinger is the host.
October 4, 2007 -- Special Lecture -- 4:00 p.m. -- Kiva Room Student Union The University of Arizona ADVANCE program will host distinguished lecturer Margaret Murnane for a talk titled How to Make Atoms Sing and Molecules Dance: Using Fast Light Pulses to Observe and Control Nature. Murnane runs a joint research group and a small laser company with her husband, Henry Kapteyn. Her research interests are ultrafast optical and X-ray science. Murnane is a fellow of the American Physical Society and the Optical Society of America and of JILA, one of the nation's leading research institutes in the physical sciences. In 1997, she was awarded the Maria Goeppert-Mayer Award of the American Physical Society, and in 2000 she was named a John D. and Catherine T. MacArthur Fellow. In 2006, she was elected a fellow of the American Academy of Arts and Sciences.
Please note that Dr. Murname is also scheduled to present a Special Physics Colloquium at the College of Optical Sciences on October 5.
Optical Sciences Calendar
Please check out our nifty new calendar at http://www.optics.arizona.edu/Calendar/index.asp?month=9&year=2007
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Optics Employment
NASA Cooperative Education Program (CO-OP) position. NASA Goddard Space Flight Center. If you'd like to gain experience in optical systems modeling, integration and testing in parallel with your education (as well earning a paycheck as a federal employee), then the CO-OP program is for you. As a point of reference, Blair Unger, Ph.D. student in Duncan Moore's group, has recently worked as a CO-OP at NASA. General requirements are: Have completed 30 semester hours (undergraduate), or be a graduate student (Masters or Ph.D.) Be a U.S. citizen. Have a good scholastic standing (G.P.A > 2.9 overall). More information is at: http://ohcm.gsfc.nasa.gov/job_student/coop/home.htm Please email Joseph Howard at joseph.m.howard@nasa.gov with questions.
Staff Research Engineering Position. Marshall Media Inc. Do you want to work at a company that produces state-of-the-art optical media products that can put a thousand gigabits of digital content in the palm of your hand? There’s an opportunity to do just that at Marshall Media Inc (MMI), one of the leading innovators in the field of data storage. MMI is a well funded media start-up in Southern California having offices in Glendale, Burbank, Irvine and Florida. This position is for Irvine Research Facilities. MMI is engaged in several layers of fundamental technological innovations for media and core industry. Responsibilities: A well trained material scientist/physicist and electronic engineer with hands-on experience with a host of analytical and electronic equipments. Perform fundamental research in advanced data storage technology with an emphasis on optical recording (Holographic, Near-Field, Super-RENS). Strong hands on experimentalist with various thin-film deposition techniques (PVD, IBD) of dielectric and metallic thin films and use of design of experiments (DOE). Familiarity with metrology tools (SEM, AFM, TEM) desirable. Use modeling (Z-max, Code-V, Lab-View) and data analysis for optical system and lens design to come up with novel optical reader design and compare theoretical results with experimental data as well as assess the tolerance issues of optical systems. Implement high NA optics for high density optical data storage. Expertise in optical test setup. Expertise in deposition of nonlinear optical and. Photo-chromic optical and dielectric thin films and design of experiments. Organized, self motivated with a track record of innovations. Strong interpersonal and communication skills. Self motivated, capable of working alone or equally as well with others. Desire and ambition to exceed expectations. Education: This candidate will be part of hardware development team. The candidate is expected to bring innovative ideas in data storage systems. Ph.D. in Materials Science /Engineering, Physics or equivalent experience is required. Contact: Dr. Nader Mahvan, Sr Director, R&D, Marshall Media Inc., Tel: (949) 387 7056 x19. nmahvan@marshallmediainc.com
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Veeco
cordially invites you to attend a free Metrology Seminar and
Workshop at UA's College of Optical Sciences. There is
no fee to attend, but seating is limited. Registration
is available online at
Edmund
Optics will host a career opportunity information session
Friday, September 28, at 3:00 p.m. in the 8th Floor
Conference Room, Meinel 821.