Metallic quantum dots implanted in a silicon dioxide thin layer, grown on a silicon substrate, show promising field emission properties, giving an emission current of 1nA at electric fields as low as 5V/μm. This value is achieved for an implantation dose 5x10 16 ions/cm 2 , compared to 120 V/μm for the lowest dose. Electron microscopy reveals that the Co dots form metallic spheres, with a narro...

Scanning transmission electron microscopy (STEM) images often show intensity noise due to emission fluctuation. This type of image noise often happens with field emission guns (FEG) and we may call it FEG noises. The FEG noise can become readily noticeable for a certain high intensity STEM images and usually deteriorate image quality. Fig. 1A shows an annular dark field (ADF) STEM image, where ...

We propose a gold modified bow-tie plasmonic nano-antenna, which can be suitably used in combination with total internal reflection fluorescence microscopy. The plasmonic nano-antenna, supporting well-separated multiple resonances, not only concentrates the total internal reflection evanescent field at the deep subwavelength scale, but also enhances fluorescence emission by the Purcell effect. ...

Cathodoluminescence spectroscopy has been performed on silver nanoparticles in a scanning electron microscopy setup. Peaks appearing in the visible range for particles fabricated on silicon substrate are shown to arrive from excitation of out-of-plane eigenmodes by the electron beam. Monochromatic emission maps have been shown to resolve spatial field variation of resonant plasmon mode on lengt...

We have mapped the internal pump intensity distribution by monitoring the spontaneous emission intensity along the cleaved edge of an optically pumped vertical-cavity surface-emitting laser (VCSEL) using the high spatial resolution and shallow depth of field provided by near-field scanning optical microscopy (NSOM) [1]. The spontaneous emission of quantum wells placed throughout the distributed...

The observation of field induced electron emission from room temperature grown carbon nanofibers at low ~5 V/mm! macroscopic electric fields is reported. The nanofibers were deposited using methane as a source gas in a conventional rf plasma enhanced chemical vapor deposition reactor using a Ni metal catalyst previously subjected to an Ar plasma treatment. Analysis of the scanning electron micr...

We have studied a thin FeO film on Pts111d using scanning tunneling microscopy. The corrugation of the Moiré pattern, that arises due to a lattice mismatch between the oxide film and the substrate, is found to increase dramatically when the microscope is operated in the field-emission regime. This contrast enhancement can be attributed to variations in the energy at which field-emission resonan...

Zinc oxide thin films have been obtained on bare and GaN buffer layer decorated Si (111) substrates by pulsed laser deposition (PLD), respectively. GaN buffer layer was achieved by a two-step method. The structure, surface morphology, composition, and optical properties of these thin films were investigated by X-ray diffraction, field emission scanning electron microscopy, infrared absorption s...

abstract the spontaneous emission spectrum from a driven three-level atom placed inside a double-band photonic crystal has been investigated. we use the model which assumes the upper levels of the atomic transition are coupled via a classical driving field. the transition from one of the upper levels to lower level couples to the modes of the modified reservoir, and the transition from the othe...