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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...
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 present a chiral single-arm relief on a micro-meter scale formed in an azo-polymer film by the irradiation of a green optical vortex. A 2-dimensional chiral relief array was also fabricated in the azo-polymer film.
Optical vortices, having an orbital angular momentum due to a helical wavefront, have been intensely employed in various fields, including optical trapping, optical tweezers and spanners for microstructures. Recently, we demonstrated the formation of twisted (chiral) metal nanoneedles by the deposition of optical vortex pulses, in which the orbital angular momentum of the optical vortex is transferred...
Optical vortices with a helical wavefront due to a phase singularity, and circularly polarized light with a helical electric field have an orbital angular momentum (Lħ) and a spin angular momentum (Sħ), respectively. Consequently, a circularly polarized optical vortex will carry the total angular momentum (Jħ=Lħ+Sħ), defined by the vector sum of the orbital and spin angular momenta. In recent years,...
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