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Bessel beam
About: Bessel beam is a research topic. Over the lifetime, 1946 publications have been published within this topic receiving 42264 citations.
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TL;DR: In this paper, the symmetry group of a nonlinear crystal is revealed by the observation of the spatial angular dependence of the lower frequency generated light, which provides direct information about the symmetry groups of the crystal.
Abstract: We put forward a technique to unveil to which symmetry group a nonlinear crystal belongs, making use of nonlinear optics with structured light. We consider as example the process of spontaneous parametric down-conversion. The crystal, which is illuminated with a special type of Bessel beam, is characterized by a nonlinear susceptibility tensor whose structure is dictated by the symmetry group of the crystal. The observation of the spatial angular dependence of the lower-frequency generated light provides direct information about the symmetry group of the crystal.
1 citations
TL;DR: Tadahiro Kawasaki, Takafumi Ishida, Tetsuji Kodama, Takayoshi Tanji and Takashi Ikuta as discussed by the authors, 1. Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya, Japan 2. Institute of Materials and Systems for Sustainability.
Abstract: Tadahiro Kawasaki, Takafumi Ishida, Tetsuji Kodama, Takayoshi Tanji and Takashi Ikuta, 1. Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya, Japan 2. Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, Japan 3. Global Research Center for Environment & Energy based on Nanomaterials Science, Tsukuba, Japan 4. Graduate School of Science & Technology, Meijo University, Nagoya, Japan 5. Faculty of Engineering, Osaka Electro-Communication University, Neyagawa, Japan
1 citations
21 Oct 2008
TL;DR: In this paper, the subwavelength annular apertures (SAA) made on metallic layers by electron beam lithography with metal lift-off processes have been demonstrated.
Abstract: The subwavelength annular apertures (SAA) made on metallic layers by electron beam lithography with metal lift-off processes have been demonstrated. We have experimentally enhanced the Bessel beam distance through the SAA structure with large diameters.
1 citations
1 citations
TL;DR: The arrayed-waveguide deflector for 3D light beam steering is described in this article, where the proposed structure with a 2D waveguide is suitable for using the electrooptic effect.
Abstract: The arrayed-waveguide deflector for 3-D light beam steering is described. The proposed structure with a 2-D waveguide is suitable for using the electrooptic effect. The device can also generate a light beam with phase singularity. Its usage is expected to find many applications including measurement and information processing. When the device is used to implement an N channel large-scale optical switch, only a 3N1/2 waveguide array is required for a phaser. Fast beam steering will lead to new field of applications impossible with conventional devices.
1 citations