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Title: Directional Excitation of Surface Plasmon Polaritons via Molecular Through-Bond Tunneling across Double-Barrier Tunnel Junctions
Authors: Wei Du
Yingmei Han
Hongting Hu
Hong-Son Chu
Harshini V. Annadata
Tao Wang 
Nikodem Tomczak 
Keywords: Molecular junction
surface plasmon
double barrier
tilt angle
Issue Date: 11-Jun-2019
Publisher: American Chemical Society
Citation: Wei Du, Yingmei Han, Hongting Hu, Hong-Son Chu, Harshini V. Annadata, Tao Wang, Nikodem Tomczak, NIJHUIS,CHRISTIAN ALBERTUS (2019-06-11). Directional Excitation of Surface Plasmon Polaritons via Molecular Through-Bond Tunneling across Double-Barrier Tunnel Junctions. Nano Letters 19 (7) : 4634–4640. ScholarBank@NUS Repository.
Abstract: Directional excitation of surface plasmon polaritons (SPPs) by electrical means is important for the integration of plasmonics with molecular electronics or steering signals toward other components. We report electrically driven SPP sources based on quantum mechanical tunneling across molecular double-barrier junctions, where the tunneling pathway is defined by the molecules’ chemical structure as well as by their tilt angle with respect to the surface normal. Self-assembled monolayers of S(CH2)nBPh (BPh = biphenyl, n = 1–7) on Au, where the alkyl chain and the BPh units define two distinct tunnel barriers in series, were used to demonstrate and control the geometrical effects. The tilt angle of the BPh unit with respect to the surface normal depends on the value of n, and is 45° when n is even and 23° when n is odd. The tilt angle of the alkyl chain is fixed at 30° and independent of n. For values of n = 1–3, SPPs are directionally launched via directional tunneling through the BPh units. For values of n > 3, tunneling along the alkyl chain dominates the SPP excitation. Molecular level control of directionally launching SPPs is achieved without requiring additional on-chip optical elements, such as antennas, or external elements, such as light sources. Using the molecular tunneling junctions, we provide the first direct experimental demonstration of molecular double-barrier tunneling junctions.
Source Title: Nano Letters
ISSN: 15306984
DOI: 10.1021/acs.nanolett.9b01665
Appears in Collections:Staff Publications

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