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We demonstrated plasmon-enhanced nearfield induced chiral mass transport, in which a superimposed azo-polymer thin film was twisted around the chiral surface relief formed by optical vortex illumination in combination with nano-imprinting technology.
We demonstrated the fabrication of twisted fiber by illumination of a 405nm continuous wave optical vortex onto a glass cell containing ultraviolet curing resin. A twisted fiber with a length of ∼160μm was established by an exposure time of only 1 second, and its twisted direction and branching number were fully assigned based on the handedness and the topological charge of the illuminated optical...
Crystalline silicon, used as a base material in the electronics industry, has been widely investigated in a variety of fields; particularly, nano- or micro-structured crystalline silicon will act as a fundamental element for photonics, photonic crystals, and solar cells.
An optical vortex, e.g., Laguerre-Gaussian mode, has been widely applied to a variety of research activities, such as super resolution microscopes, spatial division multiplexing telecommunications, and microfabrications, because it carries an annular spatial form and orbital angular momentum characterized by h per photon (where / is an integer defined as the topological charge) associated with its...
An organic azo-polymer [1], exhibiting surface relief formation arising from light-induced mass transport through cis-trans photo-isomerization, has been investigated for a variety of applications; this includes optical integrated circuits and holographic data storages. In general, the mass transport driving force acts along a gradient of the optical spatial intensity profile, and it is thus difficult...
Optical vortices [1] exhibit a doughnut-shaped spatial form and an orbital angular momentum defined by I (a topological charge) arising from a twisted wavefront and phase singularity, and they have been widely studied in various research fields, such as optical manipulation, super-resolution microscopy, telecommunication, and materials processing [2].
We demonstrate highly intense, monocycle 0.6-terahertz (THz) vortex generation by utilizing a Tsurupica spiral phase plate in combination with a tilted-pulse front pumping optical rectification THz generator formed of a prism-cut LiNbO3 crystal. A maximum THz vortex pulse energy of 2.3 μJ was obtained.
Optical vortex illumination enables the creation of silicon needles with a height of ∼14 and a thickness of ∼2 μm. Silicon needle formation requires an optical vortex pulse with a pulse duration of 10∼20 ps, so as to create thermally-melted silicon with fewer heat diffusion effects.
We have demonstrated a tunable mid-infrared optical vortex generation by an optical vortex pumped 2 μm optical parametric oscillator in combination with a AgGaSe2 difference frequency generator. The lasing wavelength of the vortex output was tuned within a ‘whole mid-infrared’ wavelength region of 6–18 μm.
We developed an octave-band tunable optical vortex laser based on a 0.532-μm optical vortex-pumped optical parametric oscillator with an extended cavity configuration by employing cascaded non-critical phase-matching LiB3O5 crystals. The optical vortex output was tuned within a wavelength range of 735nm-1893nm, and a pulse energy of 0.24–2.36 mJ was also achieved.
We discovered that a nanosecond optical vortex pulse can create a chiral cone‐shaped monocrystalline silicon (Si) nanostructure (chiral Si nanocone) by transferring its optical angular momentum to a monocrystalline Si substrate. The fabricated Si nanocone, with a length of 4.8 µm and a tip curvature of ∼110 nm, was fully monocrystalline, and it had a spiral structure with an 86 nm line width on a...
Handedness control of the mid-infrared vortex output from a ZnGeP2 difference frequency generator pumped by a 1-μm vortex pumped KTiOPO4 optical parametric oscillator was demonstrated over a frequency range of 9–12 μm.
We developed a widely tunable 1-μm optical vortex laser formed of a 0.5-μm vortex pumped optical parametric oscillator by employing non-critical phase-matching LiB3O5 crystals. Tunable vortex output was obtained in the wavelength range of 880–1345nm.
We developed a high average power, diffraction-limited (M2∼1.1) picosecond laser system formed of a sapphire face-cooled Nd:YVO4 slab amplifier with a multi-pass geometry. Average output power of 46.4 W was obtained at an optical-optical efficiency of 56%.
We present the first demonstration of the ultrahighly efficient second harmonic generation of an optical vortex pulse. An optical-optical efficiency of >70% frequency-doubled vortex output was obtained.
A novel sensing technique is developed that makes use of evanescent terahertz (THz) waves without directly detecting the THz wave. The technique is demonstrated for measuring changes in the electric field of near-infrared light, transcribed from changes in the electric field of THz waves. The method will enable sensing of various materials in the THz-frequency region, to provide knowledge about chemical...
We demonstrate a tunable mid-infrared (6.3–7.8-µm) vortex laser formed of a 1-µm vortex pumped optical parametric oscillator and a difference frequency generator. Maximum output energy of 160-µJ was obtained at a wavelength of 6.5-µm.
We report a novel spectroscopy technique that uses an evanescent terahertz wave, without detecting the THz wave directly. It will be possible to measure various material in real-time at the terahertz frequency region.
We for the first time demonstrated a chiral mono-crystalline cone-shaped silicon structure (chiral Si nano-cone). It was fabricated on a nano-scale by transferring the optical angular momentum of optical vortex to a mono-crystalline Si substrate.
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