Open AccessCapacitive effect in ultrafast laser-induced emission from low conductance diamond nanotips
Author(s) -
Olivier Torresin,
Julien Mauchain,
Mario Borz,
Ivan Blum,
Angela Vella,
Bénoît Chalopin
Publication year - 2020
Publication title -
new journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.584
H-Index - 190
ISSN - 1367-2630
DOI - 10.1088/1367-2630/aba5bf
Subject(s) - femtosecond , laser , physics , diamond , ultrashort pulse , field electron emission , optoelectronics , electron , capacitive sensing , saturation (graph theory) , optics , atomic physics , materials science , electrical engineering , engineering , mathematics , quantum mechanics , combinatorics , composite material
Single crystal diamond nanotips reveal a new behavior for ultrafast laser-induced electron emission. Under tightly focused femtosecond laser illumination, electron yield shows a saturation with the laser intensity. When the DC bias is sufficient for dark field emission, large optical intensities can switch off the emission occurring between laser pulses during a few hundred μ s, because of the low conductance of the diamond tip. We propose a macroscopic model to combine a capacitive effect with the different conduction and emission mechanisms. This study shows that non-metallic photocathodes offer different perspectives from the conventional metallic ones.