Three-dimensional light distribution near the focus of a tightly focused beam of few-cycle optical pulses

Romallosa, Kristine Marie; Bantang, Johnrob Y.; Saloma, Caesar

doi:10.1103/physreva.68.033812

Cited by 20 publications

(5 citation statements)

References 13 publications

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“…The integral was calculated only for the central wavelength ( % 775 nm) of the femtosecond laser radiation which has a FWHM spectral bandwidth of % 5 nm. The effect of light polychromaticity on the intrafocal intensity distribution becomes noticeable only for very short (< 10 fs), broadband laser pulses [30]. However, even in this extreme case the main features associated with the vectorial character of the beam remain essentially intact.…”

mentioning

confidence: 99%

Revealing Local Field Structure of Focused Ultrashort Pulses

et al. 2011

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We utilize the interaction of tightly focused ultrashort pulses with transparent media to imprint their local polarization in the focal region. In particular, we demonstrate that this technique allows for a subwavelength resolution diagnostic of complex polarization states including the presence of the longitudinal component of the electric field. Moreover, we demonstrate the first ever material ablation with the longitudinal electric field of femtosecond pulses.

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mentioning

confidence: 99%

Revealing Local Field Structure of Focused Ultrashort Pulses

et al. 2011

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“…where (r,  , t) is the incoming time-dependent polar coordinate; σ 0 and m stand for the beam waist and the topological charge of the incident beam; A(t) = exp[-(a g t/T) 2 ]exp(-iω 0 t) is the temporal pulse having a Gaussian shape envelope, in which a g = (2ln2) 1/2 , T denotes the pulse duration, as well as ω 0 is its central angular frequency. According to the time-dependent vectorial diffraction theory [16][17]18 , we can garner the focal light fields in the Fourier domain,…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Despite of significant progresses, these approaches still suffer from several possible limitations in practice, such as two-level quantum systems, paraxial optical configurations as well as restricted near-field regions. To cope with these issues, approaches exploring the ultrafast optical fields by tightly focusing linearly/radially polarized (vortex) beams based on the time-dependent vectorial diffraction theory have been proposed [16][17]18 . In addition, Zhan et al recently demonstrated that transverse spatial-time optical vortex beams are achievable through a controllable linear pulse shaping method 19 .…”

Section: Introductionmentioning

confidence: 99%

Ultrafast multi-target control of tightly focused light fields

Zhang¹,

Liu²,

Lin³

et al. 2022

OEA

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“…One the other hand, the same hybridly polarized counterpart in the presence of vortex phases is also focused by the same objective lens, enabling the locally induced circular polarization at the focus of the total light field, therefore allowing access to the ultrafast OTLS conversion. In this connection, we start from an incident hybridly polarized light field with the vortex-dressed Laguerre-Gaussian (LG) femtosecond pulse envelope, which in the pupil plane can be featured by, [34][35][36] Eðr, φ, tÞ…”

Section: Theoretical Analyses Of Ultrafast Hybridly Polarized Vectori...mentioning

confidence: 99%

Ultrafast Spin‐to‐Orbit and Orbit‐to‐Local‐Spin Conversions of Tightly Focused Hybridly Polarized Light Pulses

Zhang

Zhao

et al. 2022

Advanced Photonics Research

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Spin–orbit interaction (SOI) has provided a new viable roadmap for the development of spin‐based photonics devices. However, existing strategies to control the SOI focus commonly on tailoring the spatial dimension of light fields yet neglecting the inherent temporal one. Herein, ultrafast temporal effects on both spin‐to‐orbit and orbit‐to‐local‐spin conversions based on the time‐assistant vectorial diffractive theory and the fast Fourier transformation are first presented. Such interconversions depend upon whether the incident hybridly vectorial light pulse carries vortex phase or not in a single high numerical aperture geometry. For the case of the absence of vortex phase, it is found that it enables orbit angular momentum‐carrying transverse component fields, and the resultant orbit angular momentum embedded within focused light fields remains constantly revolving as time elapses, which indicates that the controllable spin‐to‐orbit conversion occurs. By contrast, it is revealed that hybridly polarized vectorial‐vortex light pulses allow access to the locally excited circular polarization at the focus, and this induced local circular polarization is independent of ultrafast varying time, whereas the resulting spin angular momentum density components experience the alternation between the appearance and annihilation over time, thus giving rise to the tunable orbit‐to‐local‐spin conversion. These exotic ultrafast interconversions not only breathe a new life into the area of ultrafast photonics, but refresh our understanding on the paradigm of photonic SOI.

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Three-dimensional light distribution near the focus of a tightly focused beam of few-cycle optical pulses

Cited by 20 publications

References 13 publications

Revealing Local Field Structure of Focused Ultrashort Pulses

Revealing Local Field Structure of Focused Ultrashort Pulses

Ultrafast multi-target control of tightly focused light fields

Ultrafast Spin‐to‐Orbit and Orbit‐to‐Local‐Spin Conversions of Tightly Focused Hybridly Polarized Light Pulses

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