Probing ultrafast phenomena with radially polarized light

Kim, Hyun‐Joo; Akbarimoosavi, Maryam; Feurer, Thomas

doi:10.1364/ao.55.004389

Cited by 11 publications

(5 citation statements)

References 16 publications

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“…the multiple magnetic field vortices in Figure 4), which can be observed experimentally. Finally, the results presented here suggest that such ultrashort pulses can be employed to study transient phenomena in matter [16,[27][28][29].…”

Section: Discussionmentioning

confidence: 70%

Singularities in the flying electromagnetic doughnuts

et al. 2019

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Flying doughnuts (FDs) are exact propagating solutions of Maxwell equations in the form of single-cycle, space-time non-separable toroidal pulses. Here we review their properties and reveal the existence of a complex and robust fine topological structure. In particular, the electric and magnetic fields of the FD pulse vanish across a number of planes, spherical shells and rings, and display a number of point singularities including saddle points and vortices. Moreover, the instantaneous Poynting vector of the field exhibits a large number of singularities, which are often accompanied by extended areas energy backflow.

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Section: Discussionmentioning

confidence: 70%

Singularities in the flying electromagnetic doughnuts

et al. 2019

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“…Jin-Ying Guo, Xin-Ke Wang, Jing-Wen He, Huan Zhao, Sheng-Fei Feng, Peng Han, Jia-Sheng Ye, Wen-Feng Sun, Guo-Hai Situ,* and Yan Zhang* DOI: 10.1002/adom.201700925 as well as ultrafast phenomena sensing. [11] Practical applications for nondiffracted waves include light collimating, focusing, and shaping. [12][13][14] The Lorentz beam is a nondiffracted wave that is characterized by small size, long focal length, and extended transmission distance.…”

Section: Generation Of Radial Polarized Lorentz Beam With Single Layementioning

confidence: 99%

“…[11] Practical applications for nondiffracted waves include light collimating, focusing, and shaping. [12][13][14] The Lorentz beam is a nondiffracted wave that is characterized by small size, long focal length, and extended transmission distance.…”

mentioning

confidence: 99%

Generation of Radial Polarized Lorentz Beam with Single Layer Metasurface

Guo

Wang

et al. 2017

Advanced Optical Materials

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as well as ultrafast phenomena sensing. [11] Practical applications for nondiffracted waves include light collimating, focusing, and shaping. [12][13][14] The Lorentz beam is a nondiffracted wave that is characterized by small size, long focal length, and extended transmission distance. [12] Typical techniques to produce Lorentz beams usually involve combinations of multiple optical elements. However, such systems are bulky, complicated, and inconvenient. To generate such novel beams simply, we employ a single layer metasurface device to modulate simultaneously the amplitude and polarization of the illuminating light. Metasurfaces are viewed as a kind of artificial material composed of periodic subwavelength metal or dielectric structures. When coupled resonantly to the electric and/or magnetic components of an incident electromagnetic field, they provide a spatially varying optical response (e.g., scattering amplitude, phase, and polarization). With the advantage of easy-etching, ultrathin as well as miniaturization, a broad range of applications of metasurfaces has been reported, including superlenses, [15,16] wave plates, [17][18][19] nonlinear optics, [20] and holograms. [21] However, these previous studies were focused on modulating one attribute of light beams, for example amplitude, phase or polarization. Several studies were reported to have modulated the phase [22] and polarization direction. [23] Only numerical simulations are carried out to demonstrate the ability of metasurface for multiple parameters modulation because double-layer structures [24] are difficult to fabricate. Traditionally, the concentric metal-ring wire grid is used to achieve radial polarization. [25][26][27] The structure is relatively simple but fails to generate amplitude modulation. Furthermore, circularly polarized light is required to generate radially polarized light; nevertheless, it comes accompanied by an unexpected vortex phase distribution. In this work, a designed metasurface is fabricated consisting of crosses of various sizes and orientations. The variation in size is employed to modulate the amplitude whereas variation in orientation is used to modulate the polarization distribution. With right/left circularly polarized (RCP/LCP) incidence, the output polarization may be radial or angular, whereas the amplitude obeys the Lorentz distribution. Nine cross structures were fabricated to achieve certain desired amplitude and polarization modulations. The polarization and amplitude distributions of the beam generated by the device are detected using a terahertz focal plane imaging system. A strong agreement between theoretical and experimental results was

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“…Among the variety of spatiotemporal beams, the "optical vortex" (OV) beam has particularly attracted attention over the past decades because of its interesting feature of carrying the optical orbital angular momentum (OAM) 15 corresponding to a helical wavefront with a mathematical form of exp (-iℓϕ), where ϕ is the azimuth angle and ℓ is the topological charge or the phase winding number. Owing to this distinct property, the OV beam has been applied in numerous fields and applications, such as laser manipulation/trapping 16 , laser processing [17][18][19][20] , quantum information 21,22 , super-resolution microscopy 23,24 , nonlinear spectroscopy 25,26 , and optical communications 27,28 . In current technologies, the generation of a continuouswave (CW) beam or quasi-CW OV beam has been quite sophisticated; several approaches can be adopted by converting a TEM 00 Gaussian beam into an OV beam by using astigmatic lenses 29 , spiral phase plates 30 , optical wedges 31 , computer-generated holograms (CGHs) 32,33 , a digital micromirror device (DMD) 34 , and a spatial light modulator (SLM) 35 .…”

Section: Introductionmentioning

confidence: 99%

Wavefront control of subcycle vortex pulses via carrier-envelope-phase tailoring

Lin,

Midorikawa,

Nabekawa

2023

Light Sci Appl

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The carrier-envelope phase (CEP) of an ultrashort laser pulse is becoming more crucial to specify the temporal characteristic of the pulse’s electric field when the pulse duration becomes shorter and attains the subcycle regime; here, the pulse duration of the intensity envelope is shorter than one cycle period of the carrier field oscillation. When this subcycle pulse involves a structured wavefront as is contained in an optical vortex (OV) pulse, the CEP has an impact on not only the temporal but also the spatial characteristics owing to the spatiotemporal coupling in the structured optical pulse. However, the direct observation of the spatial effect of the CEP control has not yet been demonstrated. In this study, we report on the measurement and control of the spatial wavefront of a subcycle OV pulse by adjusting the CEP. To generate subcycle OV pulses, an optical parametric amplifier delivering subcycle Gaussian pulses and a Sagnac interferometer as a mode converter were integrated and provided an adequate spectral adaptability. The pulse duration of the generated OV pulse was 4.7 fs at a carrier wavelength of 1.54 µm. To confirm the wavefront control with the alteration of the CEP, we developed a novel $$f$$ f -2$$f$$ f interferometer that exhibited spiral fringes originating from the spatial interference between the subcycle OV pulse and the second harmonic of the subcycle Gaussian pulse producing a parabolic wavefront as a reference; this resulted in the successful observation of the rotation of spiral interference fringes during CEP manipulation.

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Probing ultrafast phenomena with radially polarized light

Cited by 11 publications

References 16 publications

Singularities in the flying electromagnetic doughnuts

Singularities in the flying electromagnetic doughnuts

Generation of Radial Polarized Lorentz Beam with Single Layer Metasurface

Wavefront control of subcycle vortex pulses via carrier-envelope-phase tailoring

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