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Needle-like single crystal diamond structures were obtained by combination of the plasma enhanced chemical vapor deposition (CVD) and selective oxidation techniques. Field emission currents and total electron energy distributions were measured for individual diamond needles as functions of extraction voltage and the intensity of the femtosecond laser focused on the needle. Moreover, a new set-up based...
We present experimental results on laser-induced photoemission from nanotips made of different materials, and we compare photoemission from a metal surface (tungsten) to a dielectric (diamond). Ultrashort laser pulses (15–300 fs) are used to trigger electron emission from nanotips with radii < 100nm under a moderate tip bias. We show how different laser parameters as the repetition rate, the mean...
Electron emission induced by picosecond laser from solid surfaces placed under an intense electric field has been modeled. The results show an important difference between the electrons temperature (5500 K) and the phonons temperature (850 K). In these conditions, the Fermi-Dirac distribution depends of the electron temperature, while the thermo-field emission becomes effective for temperatures well...
We report systematic investigations of the photo- and field induced electron emission from highly doped and highly ordered, flat polycrystalline diamond material by means of photo-field emission spectroscopy. The cathode was operated under pulsed tunable laser illumination (pulse duration tlaser=3.5 ns, photon energy hv=0.5−5.9 eV) in a wide power range of up to 0.7 GW/cm2 und under electrical fields...
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