In:
Optica, Optica Publishing Group, Vol. 9, No. 7 ( 2022-07-20), p. 755-
Abstract:
Measuring the field of visible light with high spatial resolution has
been challenging, as many established methods only detect a focus-averaged signal. Here, we introduce a near-field method for
optical field sampling that overcomes that limitation by employing the localization of the enhanced near-field of a nanometric needle tip. A
probe field perturbs the photoemission from the tip, which is induced by a pump pulse, generating a field-dependent current modulation that
can easily be captured with our electronic detection scheme. The approach provides reliable characterization of near-petahertz fields.
We show that not only the spiral wavefront of visible femtosecond light pulses carrying orbital angular momentum (OAM) can be resolved
but also the field evolution with time in the focal plane. Additionally, our method is polarization sensitive, which makes it
applicable to vectorial field reconstruction.
Type of Medium:
Online Resource
ISSN:
2334-2536
DOI:
10.1364/OPTICA.459612
Language:
English
Publisher:
Optica Publishing Group
Publication Date:
2022
detail.hit.zdb_id:
2779175-0
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