Optical-vortex laser ablation

Hamazaki, Junichi; Morita, Ryuji; Chujo, Keisuke; Kobayashi, Yusuke; Tanda, Satoshi; Omatsu, Takashige

doi:10.1364/oe.18.002144

Cited by 219 publications

(94 citation statements)

References 33 publications

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“…There are few reports on the use of structured light itself to form chiral structures on the nanoscale. Recently, we discovered that the helicity of a circularly polarized optical vortex can be directly transferred to an irradiated metal sample, resulting in the formation of chiral nanoneedles [16][17][18]. This is the first demonstration, to the best of our knowledge, of nanostructures created by structured light with angular momenta, and it clearly represents a new scientific phenomenon.…”

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confidence: 82%

Transfer of Light Helicity to Nanostructures

et al. 2013

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We discovered that chiral nanoneedles fabricated by vortex laser ablation can be used to visualize the helicity of an optical vortex. The orbital angular momentum of light determines the chirality of the nanoneedles, since it is transferred from the optical vortex to the metal. Only the spin angular momentum of the optical vortex can reinforce the helical structure of the created chiral nanoneedles. We also found that optical vortices with the same total angular momentum (defined as the sum of the orbital and spin angular momenta) are degenerate, and they generate nanoneedles with the same chirality and spiral frequency. DOI: 10.1103/PhysRevLett.110.143603 PACS numbers: 42.50.Tx, 42.50.Wk, 79.20.Ds, 79.20.Eb Light that has a helical wave front due to an azimuthal phase shift, expðiL Þ (where L is an integer known as the topological charge), carries orbital angular momentum, L@. Such light is referred as an optical vortex [1][2][3][4]. Optical vortices have been widely investigated for applications such as optical trapping and guiding [5][6][7], as well as superresolution microscopy [8,9]. Circularly polarized light has a helical electric field and a spin angular momentum, S@, associated with its circular polarization. Optical vortices with circular polarization exhibit both wave front and polarization helicities, and a total angular momentum, J@ [10-12], which is defined as the sum of the orbital and spin angular momenta. This angular momentum is evidenced by the orbital and spinning motions of trapped particles in optical tweezers.To date, several researchers have intensely studied the interaction of structured light, such as radially polarized beams, with plasmonic or metallic structures [13][14][15]. However, these previous studies mostly focused on optical properties, such as mode selection, plasmon focusing, etc., of plasmonic or metallic structures, including photonic crystals as well as plasmonic waveguides, prepared by conventional integrated photonic circuit techniques based on lithography and chemical etching. There are few reports on the use of structured light itself to form chiral structures on the nanoscale. Recently, we discovered that the helicity of a circularly polarized optical vortex can be directly transferred to an irradiated metal sample, resulting in the formation of chiral nanoneedles [16][17][18]. This is the first demonstration, to the best of our knowledge, of nanostructures created by structured light with angular momenta, and it clearly represents a new scientific phenomenon.We have also investigated control of the chirality of formed nanoneedles by changing the sign of the optical vortex helicity. Chiral nanostructures have the potential to form many new material structures [19], including planar chiral metamaterials [20,21] and plasmonic nanostructures [22,23]. They can also be used to selectively identify the chirality of chemical composites in nanoscale imaging systems, such as atomic force and scanning tunnel microscopes [24][25][26][27].However, it is currently unclear whe...

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confidence: 82%

Transfer of Light Helicity to Nanostructures

et al. 2013

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“…The surface processed using twisted light exhibited less debris in comparison with one using untwisted annular nanosecond pulses [6]. The laserinduced plasma acquires orbital angular momentum [7][8][9] from the twisted light, and it consequently starts to rotate along the intensity profile of the light, thereby assisting in the ablation process and resulting in a smoother surface.…”

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confidence: 99%

Metal microneedle fabrication using twisted light with spin

et al. 2010

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Microneedle fabrication on a metal surface based on laser ablation using twisted light with spin was demonstrated, for the first time.The resulting needle showed a height of at least 10 µm above the target surface and a tip diameter of less than 0.3 µm. We also demonstrated the fabrication of a two-dimensional 5 × 6 microneedle array. The needles were uniformly well shaped with an average length and tip diameter of about 10 and 0.5 µm, respectively. ©2010 Optical Society of America

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“…Further research is necessary to determine if the OAM of the optical vortex pulse could create clearer and smoother processed surfaces and produce chiral microneedle, as demonstrated in the nanoscale time regime [38,39]. Femtosecond laser vortex pulses have also been applied to fundamental studies in laser-matter interaction such as nonlinear effects and filamentation [40][41][42][43][44] and in characterizing topological properties of materials [12].…”

Section: Discussionmentioning

confidence: 99%

Femtosecond spatial pulse shaping at the focal plane

Martínez-Matos¹,

Vaveliuk²,

Izquierdo³

et al. 2013

Opt. Express

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Abstract:Spatial shaping of ultrashort laser beams at the focal plane is theoretically analyzed. The description of the pulse is performed by its expansion in terms of Laguerre-Gaussian orthonormal modes. This procedure gives both a comprehensive interpretation of the propagation dynamics and the required signal to encode onto a spatial light modulator for spatial shaping, without using iterative algorithms. As an example, pulses with top-hat and annular spatial profiles are designed and their dynamics analyzed. The interference of top-hat pulses is also investigated finding potential applications in high precision pump-probe experiments (without using delay lines) and for the creation of subwavelength ablation patterns. In addition, a novel class of ultrashort pulses possessing non-stationary orbital angular momentum is also proposed. These exotic pulses provide additional degrees of freedom that open up new perspectives in fields such as laser-matter interaction and micro-machining.

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Optical-vortex laser ablation

Cited by 219 publications

References 33 publications

Transfer of Light Helicity to Nanostructures

Transfer of Light Helicity to Nanostructures

Metal microneedle fabrication using twisted light with spin

Femtosecond spatial pulse shaping at the focal plane

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Optical-vortex laser ablation

Cited by 219 publications

References 33 publications

Transfer of Light Helicity to Nanostructures

Transfer of Light Helicity to Nanostructures

Metal microneedle fabrication using twisted light with spin

Femtosecond spatial pulse shaping at the focal plane

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Metal microneedle fabrication using twisted light with spin