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Science 16 March 1990:
Vol. 247. no. 4948, pp. 1317 - 1319
DOI: 10.1126/science.247.4948.1317
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Articles

Femtosecond Pulse Sequences Used for Optical Manipulation of Molecular Motion

A. M. Weiner 1, D. E. Leaird 1, Gary P. Wiederrecht 2, and Keith A. Nelson 2

1 Bell Communications Research, 331 Newman Springs Road, Red Bank, NJ 07701-7040
2 Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139

Optical control over elementary molecular motion is enhanced with timed sequences of femtosecond (10-15 second) pulses produced by pulse-shaping techniques. Appropriately timed pulse sequences are used to repetitively drive selected vibrations of a crystal lattice, in a manner analogous to repetitively pushing a child on a swing with appropriate timing to build up a large oscillation amplitude. This process corresponds to repetitively "pushing" molecules along selected paths in the lattice. Amplification of selected vibrational modes and discrimination against other modes are demonstrated. Prospects for more extensive manipulation of molecular and collective behavior and structure are clearly indicated.


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