Bao, Wei and Melli, M. and Caselli, N. and Riboli, F. and Wiersma, D. S. and Staffaroni, M. and Choo, H. and Ogletree, D. F. and Aloni, S. and Bokor, J. and Cabrini, S. and Intonti, F. and Salmeron, M. B. and Yablonovitch, E. and Schuck, P. J. and Weber-Bargioni, A. (2012) Mapping Local Charge Recombination Heterogeneity by Multidimensional Nanospectroscopic Imaging. Science, 338 (6112). pp. 1317-1321. ISSN 0036-8075 . http://resolver.caltech.edu/CaltechAUTHORS:20130102-144831284
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As materials functionality becomes more dependent on local physical and electronic properties, the importance of optically probing matter with true nanoscale spatial resolution has increased. In this work, we mapped the influence of local trap states within individual nanowires on carrier recombination with deeply subwavelength resolution. This is achieved using multidimensional nanospectroscopic imaging based on a nano-optical device. Placed at the end of a scan probe, the device delivers optimal near-field properties, including highly efficient far-field to near-field coupling, ultralarge field enhancement, nearly background-free imaging, independence from sample requirements, and broadband operation. We performed ~40-nanometer–resolution hyperspectral imaging of indium phosphide nanowires via excitation and collection through the probes, revealing optoelectronic structure along individual nanowires that is not accessible with other methods.
|Additional Information:||© 2012 by the American Association for the Advancement of Science. Received 20 August 2012; accepted 17 October 2012; Published online 25 October 2012. The authors specifically thank E. Wong for fast and high-quality technical support, as well as our colleagues at the Molecular Foundry for stimulating discussion and assistance. We thank O. Yaghi, D. Milliron, M. Crommie, J. DeYoreo, and Y. D. Suh for valuable advice, discussions and reading of the manuscript. A provisional patent application regarding the fabrication of campanile-like structures on scan probes has been filed. Work at the Molecular Foundry was supported by the U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Scientific User Facilities Division, under contract no. DE-AC02-05CH11231. Campanile tips were prepared by M. Melli, who was supported by the DOE, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, under contract no. DE-AC02-05CH11231.|
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|Deposited By:||John Wade|
|Deposited On:||02 Jan 2013 23:50|
|Last Modified:||02 Jan 2013 23:51|
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