Author(s) |
McOrist, J
Sharma, M D
Sheppard, C J R
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Publication Date |
2002-02
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Abstract |
<p>An optically-addressable liquid crystal spatial light modulator has been used to generate super-resolving masks. This approach avoids problems of low efficiency and coupling between amplitude and phase modulation, that occur when using conventional liquid crystal modulators. When addressed by a programmed light intensity distribution, it allows filters to be changed rapidly to modify the response of a system or permit the investigation of different filter designs. The device used is not pixellated, with a spatial resolution of 30 line pairs/mm over an area 18mm X 18mm, and can achieve continuously-variable phase modulation up to 1.5 wavelengths. The system consists of a write-beam that is collimated from a white-light source. An input mask was used in our experiments determines the modulation pattern of the read-beam. The read-beam from a HeNe laser reflects from the modulator and is focused by a microscope objective. The value of the phase change induced by the transparent regions of the mask can be altered continuously by adjusting the brightness of the write-beam. We have used this system to attain super-resolution by simple Toraldo filters, consisting of arrays of rings.</p>
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Citation |
v.34 (20), p. 68-69
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Link | |
Publisher |
Australian Society for Electron Microscopy Inc
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Title |
Super-resolution with an optically-addressable liquid crystal spatial light modulator
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Type of document |
Conference Publication
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Entity Type |
Publication
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