Direct observation of narrow mid-infrared plasmon linewidths of single metal oxide nanocrystals
| Autor: | Ankit Agrawal, Evan L. Runnerstrom, Robert W. Johns, Hans A. Bechtel, Sebastien D. Lounis, Delia J. Milliron |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Absorption spectroscopy Science Oxide Physics::Optics General Physics and Astronomy Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences Article General Biochemistry Genetics and Molecular Biology Spectral line Condensed Matter::Materials Science chemistry.chemical_compound Laser linewidth Physics::Atomic and Molecular Clusters Plasmon Multidisciplinary Dopant business.industry General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Nanocrystal Optoelectronics 0210 nano-technology business Localized surface plasmon |
| Zdroj: | Nature communications, vol 7, iss 1 Nature Communications, Vol 7, Iss 1, Pp 1-6 (2016) Nature Communications Johns, RW; Bechtel, HA; Runnerstrom, EL; Agrawal, A; Lounis, SD; & Milliron, DJ. (2016). Direct observation of narrow mid-infrared plasmon linewidths of single metal oxide nanocrystals. Nature Communications, 7. doi: 10.1038/ncomms11583. Lawrence Berkeley National Laboratory: Retrieved from: http://www.escholarship.org/uc/item/8df4g70n |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/ncomms11583 |
| Popis: | Infrared-responsive doped metal oxide nanocrystals are an emerging class of plasmonic materials whose localized surface plasmon resonances (LSPR) can be resonant with molecular vibrations. This presents a distinctive opportunity to manipulate light–matter interactions to redirect chemical or spectroscopic outcomes through the strong local electric fields they generate. Here we report a technique for measuring single nanocrystal absorption spectra of doped metal oxide nanocrystals, revealing significant spectral inhomogeneity in their mid-infrared LSPRs. Our analysis suggests dopant incorporation is heterogeneous beyond expectation based on a statistical distribution of dopants. The broad ensemble linewidths typically observed in these materials result primarily from sample heterogeneity and not from strong electronic damping associated with lossy plasmonic materials. In fact, single nanocrystal spectra reveal linewidths as narrow as 600 cm−1 in aluminium-doped zinc oxide, a value less than half the ensemble linewidth and markedly less than homogeneous linewidths of gold nanospheres. Establishing the cause of inhomogeneous broadening would help to produce narrow ensemble localized surface plasmon resonance peaks, favourable for sensing applications. Here, Johns et al. use near field optics for enhancing signal contrast, enabling the measurement of mid-infrared spectra of single nanocrystals. |
| Databáze: | OpenAIRE |
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