期刊
OPTICS LETTERS
卷 36, 期 9, 页码 1665-1667出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.36.001665
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- Air Force Office of Scientific Research (AFOSR) [FA9550-09-1-0117]
- Defense Advanced Research Projects Agency (DARPA) [HR0011-09-1-0051]
- National Science Foundation (NSF) [DMR-0844115]
- Institute for Complex Adaptive Matter Branches Cost-Sharing Fund
- Department of Energy (DOE) Office of Science Graduate Fellowship Program (DOE SCGF)
- Direct For Mathematical & Physical Scien [844115] Funding Source: National Science Foundation
- Division Of Materials Research [844115] Funding Source: National Science Foundation
Here we present two-dimensional (2D) electronic spectra of the light-harvesting complex LH2 from purple bacteria using coherent pulses with bandwidth of over 100nm FWHM. This broadband excitation and detection has allowed the simultaneous capture of both the B800 and B850 bands using a single light source. We demonstrate that one laser pulse is sufficient to capture the entire 2D electronic spectrum with a high signal-to-noise ratio. At a waiting time of 800 fs, we observe population transfer from the B800 to B850 band as manifested by a prominent cross peak. These results will enable observation of the dynamics of biological systems across both ultrafast (< 1 ps) and slower (> 1 ms) timescales simultaneously. (C) 2011 Optical Society of America
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