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We demonstrate the efficiency enhancement of soft X-ray high-harmonic generation from Ar in the range of 40–200 eV using two-color (ω+3ω) mid-infrared pulses with relative phase control, which is in qualitative agreement with 3D simulations.
We illuminate resonant and off-resonant plasmonic nanoparticles with few-cycle laser pulses and measure strong-field photoemission. Recording interferometric autocorrelations with the strong-field photocurrent, we study the response of the nanoparticle near-fields to ultrafast excitation.
An algorithm for characterizing attosecond EUV pulses which is not bandwidth-limited, requires no interpolation of the experimental data, and makes no approximations beyond SFA while fully retrieving both the IR and EUV pulses is introduced.
In this work we demonstrate the design, fabrication and characterization of ultrafast, surface-plasmon enhanced Au nanorod photofield emitter arrays. We present a quantitative analysis of charge yield from plasmonic Au nanorod arrays fabricated by high-resolution electron beam lithography and triggered by 35 fs pulses of 800 nm light. We have accurately modeled both the optical field enhancement of...
In this work we investigate the use of Au nanorods as optically actuated electron emitter arrays. We have fabricated high-density arrays of 10 nm diameter Au nanorods via electron beam lithography and studied the effects of, emitter array density on charge yield, and laser intensity on emitter morphology, respectively. Additionally, we have numerically simulated the magnitude of the local electric...
We report the fabrication and characterization of ultrafast laser triggered nanostructured silicon photo-cathodes for x-ray generation via inverse Compton scattering. A highly uniform array of ∼2200 silicon pillars with 5 µm array pitch, where each pillar is capped by a nanosharp tip, shows stable current emission using 35 fs, 800 nm laser pulses. The cathodes can emit at 3.6 nA average current over...
We report the design, fabrication, and experimental characterization of a novel ultrafast optical field emission cathode comprised of a large and dense array of nano-sharp high-aspect-ratio single-crystal silicon columns (>100,000 tips, 4.6-million tips.cm−2). The cathode emits electrons with as little as 25 nJ and can produce up to 2.54 pC electron bunches per laser pulse when interacting with...
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