Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session M06: Ultrafast Phenomena in Solid-State
2:00 PM–3:48 PM,
Wednesday, June 7, 2023
Room: 206 A
Chair: Niranjan Shivaram, Purdue University
Abstract: M06.00008 : In Situ Control and Nanofocusing of Extreme Ultraviolet Solid-State High Harmonics*
3:24 PM–3:36 PM
Presenter:
Aleksey Korobenko
(University of Ottawa)
Authors:
Aleksey Korobenko
(University of Ottawa)
Sabaa Rashid
(Center for Research in Photonics, University of Ottawa, Ottawa, Canada)
Christian Heide
(Stanford University)
Andrei Y Naumov
(Joint Attosecond Science Laboratory, National Research Council of Canada and University of Ottawa, Ottawa, Canada)
David A Reis
(Stanford PULSE Institute)
Pierre Berini
(Univ of Ottawa)
Paul B Corkum
(Joint Attosecond Science Laboratory, National Research Council of Canada and University of Ottawa, Ottawa, Canada)
Giulio Vampa
(Joint Attosecond Science Laboratory, National Research Council of Canada and University of Ottawa, Ottawa, Canada)
We employ an alternative approach, by integrating a coherent short-wavelength high-order harmonics source, an MgO crystal, with a nanostructure etched in its surface, to achieve an in situ control of the emitted radiation. Shaping the surface into a high numerical aperture focusing element we can focus XUV light, 7th harmonic of an 800 nm laser, down to a waist radius of 150 nm, as demonstrated by the knife-edge measurements. The numerical aperture of the element of 0.35 competes with the best ex situ focusing elements for XUV radiation, such as ellipsoidal mirrors, Schwartschild objectives and Fresnel zone plates.
We expect the unique combination of short wavelength, small focus and high intensity to enable many applications, such as direct laser nanostructuring and nonlinear imaging with chemical specificity, an extension to the element-specific imaging pioneered at higher photon energies, and photoelectron spectro-nanoscopy. Our approach will pave way to the XUV coherent sources on a chip.
*We acknowledge funding from the W. M. Keck foundation, Alexander von Humboldt foundation, Joint Center for Extreme Photonics, US Defence Threat Reduction (DTRA, HDTRA 1-19-1-0026), US Air Force Office of Scientific Research (AFOSR, FA9550-16-1-0109) and Natural Sciences and Engineering Research Council of Canada.
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