Journal ArticleDOI
Liquid-Crystal Fresnel Zone Plate Fabricated by Microrubbing
Michinori Honma,Toshiaki Nose +1 more
TLDR
In this article, a liquid-crystal Fresnel zone plate (FZP) is fabricated by the LC molecular alignment process without the need for surface relief structures and patterned electrodes.Abstract:
A novel liquid-crystal (LC) Fresnel zone plate (FZP) is fabricated only by the LC molecular alignment process without the need for surface relief structures and patterned electrodes. It is theoretically described that the Fresnel-lens-like phase profile is achieved under optimum LC molecular orientation conditions and the polarization state of incident light, that is, the retardation of the LC cell is (n+1/2)λ (n is an integer) and the incident light is circularly polarized. The optical properties of the fabricated LC FZP are experimentally investigated. Good focusing properties are confirmed (the full width at half maximum of the spot is approximately 8% larger than that of the diffraction limit) and the light intensity of the focusing spot is found to be controllable by adjusting applied voltage.read more
Citations
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Journal ArticleDOI
Liquid crystal lenses with tunable focal length
TL;DR: In this article, the fundamental optics of lenses and its extension to lenses made of liquid crystals (LCs) are described, namely, lenses with curved surfaces, flat gradient-index lenses and composite lenses.
Patent
Broadband optics for manipulating light beams and images
TL;DR: In this article, the authors present optical systems for controlling with propagation of light beams in lateral and angular space, and through optical apertures, which can be controlled with the aid of external stimuli such as electrical fields, temperature, optical beams and mechanical means.
Journal ArticleDOI
Thin-film Pancharatnam lens with low f-number and high quality.
TL;DR: An ultra-thin lens based on the Pancharatnam phase effect using the polarization holography alignment technique, which exhibits a continuous phase profile, high efficiency, and is switchable from having a positive focal length to a negative one by changing the handedness of input circularly polarized light.
Journal ArticleDOI
Note: Automated Maskless Micro-Multidomain Photoalignment
TL;DR: A fully automated maskless exposure system for the fabrication of microscopic orientational surface alignment patterns that allows for arbitrary surface patterns over a 2 mm × 2 mm area with a resolution of 2.2 μm is presented.
Journal ArticleDOI
Liquid Crystal Optical Phase Plate with a Variable In-Plane Gradient
TL;DR: In this paper, a nematic liquid crystal (LC) optical phase plate with a large continuous in-plane gradient that is variable is proposed for beam steering with high efficiency, where the period of the grating can be varied by adjusting an applied voltage profile, which allows for continuous angular control of the diffraction angle.
References
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Journal ArticleDOI
The applications of a liquid crystal panel for the 15 gbyte optical disk systems
TL;DR: In this paper, a liquid crystal (LC) panel was applied to a tilt servo system to compensate spherical aberrations in the optical path length of light beams, which was shown to be useful for correcting disk thickness error.
Journal ArticleDOI
Digital Video Disc/Compact Disc Compatible Pick-up With Liquid Crystal Shutter
TL;DR: In this paper, an optical pick-up with a liquid crystal shutter that can read both digital video discs (DVDs) and compact discs (CDs) has been developed.