Title:
DIFFRACTION-GRATING DEVICE, IRRADIATING APPARATUS, AND IRRADIATION METHOD
Document Type and Number:
WIPO Patent Application WO/2016/051443
Kind Code:
A1
Abstract:
The present invention makes it possible to arbitrarily control the helicity of a helical wave. Furthermore, the present invention makes it possible to control the helicity of a helical wave at the level of a non-integer value less than "1". By adjusting the grating spacing or the orientations of diffraction gratings in a diffraction-grating device in which a first diffraction grating and a second diffraction grating, having edge dislocations at the grating surfaces thereof, are arrayed in one plane, a portion of a first diffraction image and a portion of a second diffraction image respectively generated by the first diffraction grating and the second diffraction grating are made to overlap each other. By choosing the overlapping region by using a diaphragm aperture, it is possible to generate a helical wave having an arbitrary helicity, including non-integer values.
Inventors:
HARADA KEN (JP)
KOHASHI TERUO (JP)
KOHASHI TERUO (JP)
Application Number:
PCT/JP2014/075788
Publication Date:
April 07, 2016
Filing Date:
September 29, 2014
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
G02B5/18; G21K1/06
Foreign References:
| US7701381B2 | 2010-04-20 |
Other References:
KO SAITO ET AL.: "Production, Propagation and Interference of Electron Vortex Beam", MICROSCOPY, vol. 48, no. 1, 30 April 2013 (2013-04-30), pages 39 - 46
Attorney, Agent or Firm:
TSUTSUI, YAMATO (JP)
Tsutsui Daiwa (JP)
Tsutsui Daiwa (JP)
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