Optical vortex pulse illumination to create chiral monocrystalline silicon nanostructures

Takahashi, Fumie; Takizawa, Shun; Hidai, Hirofumi; Miyamoto, Katsuhiko; Morita, Ryuji; Omatsu, Takashige

doi:10.1002/pssa.201532661

Cited by 28 publications

(12 citation statements)

References 40 publications

(38 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2 b showing an unclear twisted structure. These results roughly correspond with the previous report 14 . We measured the height of the twisted cone structure using atomic force microscopy (AFM).…”

Section: Resultssupporting

confidence: 94%

“…In addition, Si microdroplet ejection perpendicular to a bulk Si target surface using an optical vortex beam with a doughnut profile has been reported 11,12 , and its mechanism is probably based on laser-driven pressure. Furthermore, in an interesting result, the creation of twisted structures has been reported, corresponding with the total angular momentum of the optical vortex 13,14 . As a twisting force will enhance straight ejection of droplets by the gyro effect, an optical vortex beam is expected to offer a well-controlled fabrication technique for microparticles.…”

mentioning

confidence: 91%

See 1 more Smart Citation

Silicon twisted cone structure produced by optical vortex pulse with structure evaluation by radiation hydrodynamic simulation

Nakamura

Tasaki

Kawamoto

et al. 2020

Sci Rep

View full text Add to dashboard Cite

We demonstrate a radiation hydrodynamic simulation of optical vortex pulse-ablated microcone structures on silicon (Si) substrates. Doughnut-shaped craters were formed by single pulse irradiation on the Si substrate, and a twisted cone structure with a height of 3.5 µm was created at the center of the irradiation spot by the circularly polarized optical vortex pulse. A two-dimensional (2-D) radiation hydrodynamic simulation reproduced the cone structure well with a height of 3 µm. The central part of the incident laser power was lowered from the initial profile due to plasma shielding over the laser pulse duration for an inverted double-well laser profile. The acute tip shape of the silicon surface can survive over the laser irradiation period.

show abstract

Section: Resultssupporting

confidence: 94%

mentioning

confidence: 91%

Silicon twisted cone structure produced by optical vortex pulse with structure evaluation by radiation hydrodynamic simulation

Nakamura

Tasaki

Kawamoto

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…In general, an ultrafast laser pulse induces the recrystallized silicon to form polycrystalline structures . Such microsecond scale motion of the melted silicon in the optical vortex pulse illumination results in the high crystallinity of the silicon needle, which is identified by the electron diffraction analyses . The OAM should provide a spin on the melted silicon, resulting in the efficient accumulation of the melted silicon in the dark core forming the needle on the substrate.…”

Section: Helical Structuresmentioning

confidence: 99%

“…In this area of original physical demonstrations, recent studies have shown that irradiation by such an OAM field can twist materials, such as metal, silicon, azo‐polymer, and even a liquid‐phase resin with the help of spin angular momentum (SAM) of circularly polarized light with the rotating electric field. This can thus shape helical nano/microstructures …”

Section: Introductionmentioning

confidence: 99%

A New Twist for Materials Science: The Formation of Chiral Structures Using the Angular Momentum of Light

Omatsu

Miyamoto

Toyoda

et al. 2019

Advanced Optical Materials

Self Cite

118

View full text Add to dashboard Cite

and various applications particularly at the microscopic scale. This includes optical trapping and manipulation, [4][5][6] optical telecommunications, [7,8] quantum physics, [9] and "super-resolution" microscopy with a spatial resolution beyond the diffraction limit. [10][11][12] New applications for OAM fields have also been proposed in environmental optics and free-space telecommunication. As an example OAM states can potentially propagate though air turbulence with lower degradation than a conventional Gaussian beam. [13,14] New physical effects include studies such as the rotational Doppler effect originating from interactions of such fields and rotating objects that may provide new technologies for remote sensing of rotating bodies in astrophysics. [15,16] In this area of original physical demonstrations, recent studies have shown that irradiation by such an OAM field can twist materials, such as metal, silicon, azo-polymer, and even a liquid-phase resin with the help of spin angular momentum (SAM) of circularly polarized light with the rotating electric field. This can thus shape helical nano/microstructures. [17][18][19][20][21][22][23][24] Going beyond fundamental aspects, twisted materials created by such OAM fields may provide a new understanding of interactions between optical fields and matter on the subwavelength scale that may reveal new physics, e.g., spin-orbit coupling effects or unconventional optomechanical effects for moving beyond traditional forms of optical manipulation. Furthermore, twisted materials created by such OAM fields, will provide a new understanding of interactions between optical fields and matter on a subwavelength scale. For example, the twisted materials manifest the role of both SAM and OAM of light fields and the coupling of SAM and OAM (so-called spin-orbit coupling) effects. This coupling is key not only for understanding fundamental physics but also for controlling optical material structures.Conventional optical tweezers rely on the field gradients near the diffraction limited focus of a laser beam to hold mesoscopic particles solely with focused light beams. However, the technique often fails to efficiently trap and manipulate particles at the nanoscale because the gradient force scales with the volume of the particle (for a dielectric object) and is proportional to the particle's polarizability. In this domain, advanced materials science and nanofabrication technologies have made remarkable progress in structured devices, e.g., photonic crystals, metamaterials, and metasurfaces. These devices offer novel trapping geometries to enhance the interaction between optical fields and materials at the nanoscale. Furthermore, these devices allow the control of Recent work has shown that irradiation with light possessing orbital angular momentum (OAM) and an associated phase singularity, that is an optical vortex, twists a variety of materials. These include silicon, azo-polymer, and even liquid-phase resins to form various helically structured materials. This article provides...

show abstract

“…They have potential applications in a variety of research areas, such as optical trapping and manipulation1314, terabit high-speed optical communications1516, and chiral or achiral nanostructure fabrication1718192021. Laguerre-Gaussian (LG) modes, which are eigen modes of the para-axial electromagnetic equation in cylindrical coordinates, are well known as conventional optical vortices.…”

mentioning

confidence: 99%

Highly intense monocycle terahertz vortex generation by utilizing a Tsurupica spiral phase plate

Miyamoto

Kang

Kim

et al. 2016

Sci Rep

Self Cite

View full text Add to dashboard Cite

Optical vortex, possessing an annular intensity profile and an orbital angular momentum (characterized by an integer termed a topological charge) associated with a helical wavefront, has attracted great attention for diverse applications due to its unique properties. In particular for terahertz (THz) frequency range, several approaches for THz vortex generation, including molded phase plates consisting of metal slit antennas, achromatic polarization elements and binary-diffractive optical elements, have been recently proposed, however, they are typically designed for a specific frequency. Here, we demonstrate highly intense broadband monocycle vortex generation near 0.6 THz by utilizing a polymeric Tsurupica spiral phase plate in combination with tilted-pulse-front optical rectification in a prism-cut LiNbO3 crystal. A maximum peak power of 2.3 MW was obtained for THz vortex output with an expected topological charge of 1.15. Furthermore, we applied the highly intense THz vortex beam for studying unique nonlinear behaviors in bilayer graphene towards the development of nonlinear super-resolution THz microscopy and imaging system.

show abstract

Optical vortex pulse illumination to create chiral monocrystalline silicon nanostructures

Cited by 28 publications

References 40 publications

Silicon twisted cone structure produced by optical vortex pulse with structure evaluation by radiation hydrodynamic simulation

Silicon twisted cone structure produced by optical vortex pulse with structure evaluation by radiation hydrodynamic simulation

A New Twist for Materials Science: The Formation of Chiral Structures Using the Angular Momentum of Light

Highly intense monocycle terahertz vortex generation by utilizing a Tsurupica spiral phase plate

Contact Info

Product

Resources

About