期刊
OPTICS EXPRESS
卷 22, 期 7, 页码 8234-8242出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.22.008234
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资金
- HKUST under the internal Research Equipment Competition Fund
- Hong Kong Research Grants Council [HKU8/CRF/11G, HKUST2/CRF/10]
We demonstrate manipulation of photon emission efficiency in a tunneling gap by tuning the rates of elastic and inelastic electron tunneling processes with local electronic states. The artificial local electronic states are created by a scanning tunneling microscope tip on a CuN nanoisland grown on a Cu(100) surface at cryogenic temperature. These local electronic states can either enhance or suppress the excitation of tip-induced surface plasmon modes at specific bias voltages, and thus the induced photon emission rates. A theoretical model quantitatively analyzing inelastic and elastic tunneling processes associated with characteristic electronic states shows good agreement with experiments. We also show that tip-induced photon emission measurement can be used for probing the electronic states in the tunneling gap. (C) 2014 Optical Society of America
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