报告题目: |
Ultrafast coherent x-rays from tabletop lasers - a new tool for science and technology |
报告人: |
Henry C. Kapteyn |
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Department of Physics, JILA and NSF ERC
in EUV Science and Technology,
University of Colorado and NIST
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报告时间: |
2013-11-11 10:30 |
报告地点: |
理科楼三楼报告厅 |
主办单位: |
物理系 |
简介: |
The discovery of x-rays made possible not-only new medical technologies, but also allowed man to “see” at the atomic scale for the first time, revolutionizing our understanding of matter. Efforts to bring x-ray techniques to femtosecond time-scales—the fundamental atomic time scale— have been ongoing for the past ~¼ century, and are now providing new insight into the behavior of matter. Key to this work has been to understand the coherent high-order harmonic generation (HHG) upconversion process. HHG allows for the light from a high-power femtosecond laser to be coherently upconverted from the infrared into the soft x-ray region of the spectrum, with each x-ray photon resulting from the coherent combination of hundreds or even thousands of photons from the driving laser. The resulting femtosecond and attosecond HHG x-ray sources allow us to probe, using a tabletop setup, the fastest charge, spin and energy transport processes. The capabilities of these sources have increased dramatically with our recent demonstration of bright sources with photon energy >1 keV.[1-3] Recent applications include probing the dynamics of the quantum exchange interaction fundamental to magnetic materials;[4-8] the use of coherent HHG light for tabletop nano-imaging with record 22 nm resolution;[9-11] and studies of the physical limits of energy flow at the nanoscale.[12,13]
1. T. Popmintchev, M.-C. Chen, D. Popmintchev, P. Arpin, S. Brown, S. Ališauskas, G. Andriukaitis, T. Balčiunas, O. D. Mücke, A. Pugzlys, A. Baltuška, B. Shim, S. E. Schrauth, A. Gaeta, C. Hernández-García, L. Plaja, A. Becker, A. Jaron-Becker, M. M. Murnane, and H. C. Kapteyn, "Bright Coherent Ultrahigh Harmonics in the keV X-ray Regime from Mid-Infrared Femtosecond Lasers," Science 336(6086), 1287-1291 (2012).
3. M. C. Chen, P. Arpin, T. Popmintchev, M. Gerrity, B. Zhang, M. Seaberg, D. Popmintchev, M. M. Murnane, and H. C. Kapteyn, "Bright, Coherent, Ultrafast Soft X-Ray Harmonics Spanning the Water Window from a Tabletop Light Source," Physical Review Letters 105(17), 173901 (2010).
4. E. Turgut, C. La-o-vorakiat, J. M. Shaw, P. Grychtol, H. T. Nembach, D. Rudolf, R. Adam, M. Aeschlimann, C. M. Schneider, T. J. Silva, M. M. Murnane, H. C. Kapteyn, and S. Mathias, "Controlling the Competition between Optically Induced Ultrafast Spin-Flip Scattering and Spin Transport in Magnetic Multilayers," Physical Review Letters 110(19), 197201 (2013).
5. D. Rudolf, C. La-O-Vorakiat, M. Battiato, R. Adam, J. M. Shaw, E. Turgut, P. Maldonado, S. Mathias, P. Grychtol, H. T. Nembach, T. J. Silva, M. Aeschlimann, H. C. Kapteyn, M. M. Murnane, C. M. Schneider, and P. M. Oppeneer, "Ultrafast magnetization enhancement in metallic multilayers driven by superdiffusive spin current," Nature Communications 3, 1037 (2012).
6. C. La-O-Vorakiat, E. Turgut, C. A. Teale, H. C. Kapteyn, M. M. Murnane, S. Mathias, M. Aeschlimann, C. M. Schneider, J. M. Shaw, H. T. Nembach, and T. J. Silva, "Ultrafast Demagnetization Measurements Using Extreme Ultraviolet Light: Comparison of Electronic and Magnetic Contributions," Physical Review X 2(1), 011005 (2012).
7. C. La-O-Vorakiat, M. Siemens, M. M. Murnane, H. C. Kapteyn, S. Mathias, M. Aeschlimann, P. Grychtol, R. Adam, C. M. Schneider, J. M. Shaw, H. Nembach, and T. J. Silva, "Ultrafast Demagnetization Dynamics at the M Edges of Magnetic Elements Observed Using a Tabletop High-Harmonic Soft X-Ray Source," Physical Review Letters 103(25), 257402/257401-257404 (2009).
8. S. Mathias, C. La-O-Vorakiat, P. Grychtol, P. Granitzka, E. Turgut, J. Shaw, R. Adam, H. Nembach, M. Siemens, S. Eich, C. M. Schneider, T. J. Silva, M. Aeschlimann, M. M. Murnane, and H. C. Kapteyn, "Probing the timescale of the exchange interaction in a ferromagnetic alloy," PNAS 109, 4792 (2012).
9. B. Zhang, M. D. Seaberg, D. E. Adams, D. F. Gardner, E. R. Shanblatt, J. M. Shaw, W. Chao, E. M. Gullikson, F. Salmassi, H. C. Kapteyn, and M. M. Murnane, "Full field tabletop EUV coherent diffractive imaging in a transmission geometry," Optics Express 21(19), 21970-21980 (2013).
10. M. D. Seaberg, D. E. Adams, E. L. Townsend, D. A. Raymondson, W. F. Schlotter, Y. W. Liu, C. S. Menoni, L. Rong, C. C. Chen, J. W. Miao, H. C. Kapteyn, and M. M. Murnane, "Ultrahigh 22 nm resolution coherent diffractive imaging using a desktop 13 nm high harmonic source," Optics Express 19(23), 22470-22479 (2011).
11. R. L. Sandberg, C. Y. Song, P. W. Wachulak, D. A. Raymondson, A. Paul, B. Amirbekian, E. Lee, A. E. Sakdinawat, C. La-O-Vorakiat, M. C. Marconi, C. S. Menoni, M. M. Murnane, J. J. Rocca, H. C. Kapteyn, and J. W. Miao, "High numerical aperture tabletop soft x-ray diffraction microscopy with 70-nm resolution," Proceedings of the National Academy of Sciences of the United States of America 105(1), 24-27 (2008).
12. D. Nardi, M. Travagliati, M. E. Siemens, Q. Li, M. M. Murnane, H. C. Kapteyn, G. Ferrini, F. Parmigiani, and F. Banfi, "Probing Thermomechanics at the Nanoscale: Impulsively Excited Pseudosurface Acoustic Waves in Hypersonic Phononic Crystals," Nano Letters 11(10), 4126-4133 (2011).
个人简介：
Henry C. Kapteyn is a Professor of Physics and ECE at the University of Colorado at Boulder, and a fellow of JILA (a joint NIST/University of Colorado research institute), and CEO of Kapteyn-Murnane Laboratories Inc.. He received a BS from Harvey Mudd College in 1982, an MS from Princeton University, and a Ph.D. in Physics from the University of California at Berkeley in 1989. He and his wife and long-term collaborator, Margaret Murnane, are well known for their research in femtosecond lasers, and for understanding how to coherently upconvert this light to make a “tabletop x-ray laser” that they have applied to pioneering studies of material behavior at short length- and time-scales. He has published more than 200 papers, is a member of the National Academy of Sciences and a fellow of the American Physical Society, the Optical Society of America, and the American Association for the Advancement of Science. His awards include the Adolph Lomb Medal of the OSA in 1993, the Ahmed Zewail Award of the ACS in 2009, the R.W. Wood Prize of the OSA in 2010, the Arthur Schawlow Prize of the APS in 2010, and the Willis Lamb Award in Quantum Electronics in 2012. |
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