Steven Yampolsky | University of California, Irvine (original) (raw)
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Papers by Steven Yampolsky
Applied Physics Letters, 2015
A versatile and reconfigurable setup for all-terahertz time-resolved pump-probe spectroscopy Rev.... more A versatile and reconfigurable setup for all-terahertz time-resolved pump-probe spectroscopy Rev. Sci. Instrum. 83, 053107 (2012); 10.1063/1.4717732 Femtosecond time-resolved optical pump-probe spectroscopy at kilohertz-scan-rates over nanosecond-timedelays without mechanical delay line Appl. Phys. Lett. 88, 041117 (2006); 10.1063/1.2167812 Compact laser flash photolysis techniques compatible with ultrafast pump-probe setups Rev. Sci. Instrum. 76, 093111 (2005); 10.1063/1.2047828 A complete quantum description of an ultrafast pump-probe charge transfer event in condensed phase
Nature Photonics, 2014
The motion of chemical bonds within molecules can be observed in real time in the form of vibrati... more The motion of chemical bonds within molecules can be observed in real time in the form of vibrational wave packets prepared and interrogated through ultrafast nonlinear spectroscopy. Such nonlinear optical measurements are commonly performed on large ensembles of molecules and, as such, are limited to the extent that ensemble coherence can be maintained. Here, we describe vibrational wave packet motion on single molecules, recorded through time-resolved, surfaceenhanced, coherent anti-Stokes Raman scattering. The sensitivity required to detect the motion of a single molecule under ambient conditions is achieved by equipping the molecule with a dipolar nano-antenna (a gold dumbbell). In contrast with measurements in ensembles, the vibrational coherence on a single molecule does not undergo pure dephasing. It develops phase fluctuations with characteristic statistics. We present the time evolution of discretely sampled statistical states, and highlight the unique information content in the characteristic, early-time probability distribution function of the signal.
Applied Physics Letters, 2015
A versatile and reconfigurable setup for all-terahertz time-resolved pump-probe spectroscopy Rev.... more A versatile and reconfigurable setup for all-terahertz time-resolved pump-probe spectroscopy Rev. Sci. Instrum. 83, 053107 (2012); 10.1063/1.4717732 Femtosecond time-resolved optical pump-probe spectroscopy at kilohertz-scan-rates over nanosecond-timedelays without mechanical delay line Appl. Phys. Lett. 88, 041117 (2006); 10.1063/1.2167812 Compact laser flash photolysis techniques compatible with ultrafast pump-probe setups Rev. Sci. Instrum. 76, 093111 (2005); 10.1063/1.2047828 A complete quantum description of an ultrafast pump-probe charge transfer event in condensed phase
Nature Photonics, 2014
The motion of chemical bonds within molecules can be observed in real time in the form of vibrati... more The motion of chemical bonds within molecules can be observed in real time in the form of vibrational wave packets prepared and interrogated through ultrafast nonlinear spectroscopy. Such nonlinear optical measurements are commonly performed on large ensembles of molecules and, as such, are limited to the extent that ensemble coherence can be maintained. Here, we describe vibrational wave packet motion on single molecules, recorded through time-resolved, surfaceenhanced, coherent anti-Stokes Raman scattering. The sensitivity required to detect the motion of a single molecule under ambient conditions is achieved by equipping the molecule with a dipolar nano-antenna (a gold dumbbell). In contrast with measurements in ensembles, the vibrational coherence on a single molecule does not undergo pure dephasing. It develops phase fluctuations with characteristic statistics. We present the time evolution of discretely sampled statistical states, and highlight the unique information content in the characteristic, early-time probability distribution function of the signal.