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Creating High-Harmonic Beams with Controlled Orbital Angular Momentum

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Title
Creating High-Harmonic Beams with Controlled Orbital Angular Momentum
Author(s)
Gariepy, G; Leach, J; Kyung Taec Kim; Hammond, TJ; Frumker, E; Boyd, RW; Corkum, PB
Publication Date
2014-10
Journal
PHYSICAL REVIEW LETTERS, v.113, no.15, pp.153901 -
Publisher
AMER PHYSICAL SOC
Abstract
A beam with an angular-dependant phase Φ ¼ lϕ about the beam axis carries an orbital angular momentum of lℏ per photon. Such beams are exploited to provide superresolution in microscopy. Creating extreme ultraviolet or soft-x-ray beams with controllable orbital angular momentum is a critical step towards extending superresolution to much higher spatial resolution. We show that orbital angular momentum is conserved during high-harmonic generation. Experimentally, we use a fundamental beam with jlj ¼ 1 and interferometrically determine that the harmonics each have orbital angular momentum equal to their harmonic number. Theoretically, we show how any small value of orbital angular momentum can be coupled to any harmonic in a controlled manner. Our results open a route to microscopy on the molecular, or even submolecular, scale.
URI
http://pr.ibs.re.kr/handle/8788114/1457
DOI
10.1103/PhysRevLett.113.153901
ISSN
0031-9007
Appears in Collections:
Center for Relativistic Laser Science(초강력 레이저과학 연구단) > Journal Papers (저널논문)
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