Yanlin Ke

Janus magneto-electric nanosphere dimers exhibiting unidirectional visible light scattering and strong electromagnetic field enhancement.

Steering incident light into specific directions at the nanoscale is very important for future nanophotonics applications of signal transmission and detection. A prerequisite for such a purpose is the development of nanostructures with high-efficiency unidirectional light scattering properties. Here, from both theoretical and experimental sides, we conceived and demonstrated the unidirectional visible light scattering behaviors of a heterostructure, Janus dimer composed of gold and silicon nanospheres. By carefully adjusting the sizes and spacings of the two nanospheres, the Janus dimer can support both electric and magnetic dipole modes with spectral overlaps and comparable strengths. The interference of these two modes gives rise to the narrow-band unidirectional scattering behaviors with enhanced forward scattering and suppressed backward scattering. The directionality can further be improved by arranging the dimers into one-dimensional chain structures. In addition, the dimers also show remarkable electromagnetic field enhancements. These results will be important not only for applications of light emitting devices, solar cells, optical filters, and various surface enhanced spectroscopies but also for furthering our understanding on the light-matter interactions at the nanoscale.

A modulated field emission from carbon nanotubes cold cathode cavity resonator in L band frequency

A re-entrant cavity resonator with carbon nanotubes cold cathode was fabricated. The cold cathode was driven by L band signal and a modulated electron emission of CNTs was achieved. An average current of 3.865 μA was recorded when a 1W/1.572GHz signal was led in the cavity, corresponding density of 193.3 μA/cm2. The highest output power was obtained at nearly 1.6S A re-entrant cavity resonator with carbon nanotubes cold cathode was fabricated. The cold cathode was driven by L band signal and a modulated electron emission of CNTs was achieved. An average current of 3.865 μA was recorded when a 1W/1.572GHz signal was led in the cavity, corresponding density of 193.3 μA/cm2. The highest output power was obtained at nearly 1.65 GHz frequency under 100 mW input.GHz frequency under 100 mW input.

In-situ measurement of temperature dependence of emission current and pressure of a fully-sealed ZnO nanowire field emission device

In order to evaluate the performance of ZnO nanowire field emission display under different temperature, the temperature dependence of field emission current of a fully-sealed diode-structured field emission device using ZnO nanowire cold cathode was studied when the temperature changed from -60°C to 80°C. The pressure inside the device was also measured. It is found that the emission current decreases with increasing temperature, which is attributed to the increasing pressure. The findings are crucial to optimize the manufacture process of the FED using ZnO nanowire cold cathode.

P2–6: Preparation of large area ZnO nanoemitter cold cathode for flat panel light source by using screen-printing process

A simple and cheap way to fabricate large area ZnO nanoemitter cold cathode was introduced. The properties of the cold cathode were characterized. The potential application of the cold cathode in flat panel light source was also discussed.

Luminescent tubes based on MoO/sub 2/ nanowire cold cathode

Luminescent tubes using MoO/sub 2/ nanowires as cathode were fabricated. The performances of luminescent tubes were tested. Low operating voltage of -1000 V were achieved, uniformity and power consumption of the luminescent have also been measured.

Evolution of field emission pattern of few-layer graphene with different edge morphology

Field electron emission patterns emitted from few-layer graphene with different edge morphology were investigated using field emission microscopy (FEM). The FEM image of few-layer graphene was observed as a “lantern”, which is composed of light and dark fringes. The relationship between graphene edge morphology and field emission pattern was investigated using a emission electron spatial interference model based on the superposition principle of the emission electron.

Capture field emission pattern image of carbon nanotubes by using electron beam scanning analyzer

Field Emission Pattern Image of Carbon Nanotubes has been captured by using electron beam scanning analyzer. The measurement showed that the Faraday cup scanning method can provide a high resolution field emission sites distribution measurement (the best resolution is up to 0.01mm), which is higher than that using the transparent anode method.

Enhancement of interfacial adhesion between carbon nanotube thin film and substrate using a gold-nickel buffer layer

A gold-nickel buffer layer is used to improve the adhesion of VACNT and silicon substrate. The VACNTs exhibit an excellent adhesive behavior after a post-annealing process. The interfacial morphology and structure are characterized by SEM. The physical mechanism is also discussed.

Optimization of insulator layer with high breakdown voltage for 10 inch nanowire field emission display

In a gate-structured field emission display (FED), the insulator layer is used to keep an electrical insulation between the gate and cathode electrode. The reliability of the insulator layer is an important issue of FED fabrication, especially for large area device. In this study, the insulator layer was prepared using plasma enhanced chemical vapor deposition (PECVD) and the preparation parameters were optimized. Optimal insulator layers consisting of silicon oxide and silicon nitride stacked insulator layers were obtained and applied in a 10-inch ZnO nanowire FED device.

P2–5: Fabrication and characterization of 4.3-inch carbon nanotube cold cathodes for field emission flat panel light source

Study has been carried out into the key technological issues related to the fabrication of 4.3-inch CNT field emission flat panel light source. Controlled growth and post treatments are found to be effective approaches for achieving uniform luminescence of the light source.