Fig. 1: The irradiation setup.
From: Ion acceleration from micrometric targets immersed in an intense laser field
a Illustration of the irradiation geometry. Laser pulses focused to a 3.5 μm diameter spot, corresponding to a normalized laser amplitude of a0 = 4.6 were used to irradiate d = 0.2 μm thick, w = 2–10 μm wide μ-bars. The emitted protons were detected downstream using a magnetic spectrometer. b SEM image of a w = 5 μm wide μ-bar suspended over a gap in a Si substrate.
