scholarly journals Charge transfer plasmon resonances across silver–molecule–silver junctions: estimating the terahertz conductance of molecules at near-infrared frequencies

RSC Advances ◽  
2016 ◽  
Vol 6 (75) ◽  
pp. 70884-70894 ◽  
Author(s):  
Lin Wu ◽  
Shu Fen Tan ◽  
Michel Bosman ◽  
Joel K. W. Yang ◽  
Christian A. Nijhuis ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Space Charge ◽  
Near Infrared ◽  
Tunnel Junctions ◽  
Electromagnetic Model ◽  
Plasmon Resonances ◽  
Infrared Frequencies

Quantum plasmon resonances have been recently observed across molecular tunnel junctions. The present work extends these studies theoretically using a generalized space-charge corrected electromagnetic model for a wider range of molecules.

scholarly journals Enhancing sub-bandgap external quantum efficiency by photomultiplication for narrowband organic near-infrared photodetectors

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jonas Kublitski ◽  
Axel Fischer ◽  
Shen Xing ◽  
Lukasz Baisinger ◽  
Eva Bittrich ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Near Infrared ◽  
Optical Cavity ◽  
Hole Injection ◽  
Visible Range ◽  
Absorption Region ◽  
Electromagnetic Signals ◽  
Organic Photodetectors

AbstractDetection of electromagnetic signals for applications such as health, product quality monitoring or astronomy requires highly responsive and wavelength selective devices. Photomultiplication-type organic photodetectors have been shown to achieve high quantum efficiencies mainly in the visible range. Much less research has been focused on realizing near-infrared narrowband devices. Here, we demonstrate fully vacuum-processed narrow- and broadband photomultiplication-type organic photodetectors. Devices are based on enhanced hole injection leading to a maximum external quantum efficiency of almost 2000% at −10 V for the broadband device. The photomultiplicative effect is also observed in the charge-transfer state absorption region. By making use of an optical cavity device architecture, we enhance the charge-transfer response and demonstrate a wavelength tunable narrowband photomultiplication-type organic photodetector with external quantum efficiencies superior to those of pin-devices. The presented concept can further improve the performance of photodetectors based on the absorption of charge-transfer states, which were so far limited by the low external quantum efficiency provided by these devices.

Tunable localized surface plasmon resonances of asymmetric Au/SiO2/Au cross-shape nanobars

2014 ◽  
Vol 28 (17) ◽  
pp. 1450143 ◽  
Author(s):  
M. L. Wan ◽  
H. J. Du ◽  
Y. L. Song ◽  
F. Q. Zhou ◽  
K. J. Dai
Keyword(s):  
Electric Fields ◽  
Surface Plasmon ◽  
Near Infrared ◽  
Dipole Approximation ◽  
Localized Surface Plasmon ◽  
Surface Plasmon Resonances ◽  
Localized Surface Plasmon Resonances ◽  
Plasmon Resonances ◽  
Surface Enhanced Raman ◽  
Infrared Spectral

The plasmonic properties of asymmetric Au / SiO 2/ Au sandwiched cross-shape nanobars are investigated theoretically using the discrete dipole approximation (DDA) method. Two localized surface plasmon resonances are observed in the extinction spectra, which perform extreme sensitivity to the length and width of the nanobar and can be tuned easily throughout visible and into near-infrared spectral regions. The local electric fields around the nanobar are calculated and a pure electromagnetic Raman enhancement factor of about 106 can be achieved. In addition, compared to a monolayer gold nanobar, it exhibits more "hot spots" and stronger localized electric field enhancements. This plasmonic substrate provides potential applications in surface enhanced Raman scattering (SERS) and nonlinear optical devices.

Through space charge-transfer emission in lambda (Λ)-shaped triarylboranes and the use in fluorescent sensing for fluoride and cyanide ions

RSC Advances ◽  
2015 ◽  
Vol 5 (57) ◽  
pp. 45668-45678 ◽  
Author(s):  
He Xi ◽  
Yang Liu ◽  
Chun-Xue Yuan ◽  
Ye-Xin Li ◽  
Lei Wang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Space Charge ◽  
Fluorescent Sensors ◽  
Organoboron Compounds ◽  
Fluorescent Sensing ◽  
Efficient Strategy ◽  
New Class

By introducing a twisted and non-conjugated Λ-shaped TB scaffold to triarylboranes, we provide an efficient strategy to develop a new class of organoboron compounds applied as colorimetric and ratiometric fluorescent sensors for fluoride and cyanide.

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