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학술지 Wide Viewing-angle Holographic Display based on Enhanced-NA Fresnel Hologram
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저자
채병규
발행일
202111
출처
Optics Express, v.29 no.23, pp.38221-38236
ISSN
1094-4087
출판사
Optical Society of America (OSA)
DOI
https://dx.doi.org/10.1364/OE.435424
협약과제
21HR6100, 병리진단을 위한 편광 홀로그램 토모그래피 기술개발, 채병규
초록
The viewing-angle enlargement of a holographic image is a crucial factor for realizing the holographic display. The numerical aperture (NA) of digital hologram other than a pixel specification has been known to determine the angular field extent of image. Here, we provide a valid foundation for the dependence of viewing angle on the hologram numerical aperture by investigating mathematically the internal structure of the sampled point spread function showing a self-similarity of its modulating curve. The enhanced-NA Fresnel hologram reconstructs the image at a viewing angle larger than a diffraction angle by a hologram pixel pitch where its angle value is expressed in terms of the NA of whole hologram aperture, which is observed systematically by optical experiments. Finally, we found that the aliased replica noises generated in the enhanced-NA Fresnel diffraction regime are effectively suppressed within the diffraction scope by a digitized pixel. This characteristic enables us to overcome the image reduction and to remove the interference of high-order images, which leads to the wide viewing-angle holographic display.
KSP 제안 키워드
Digital hologram, Fresnel diffraction, Fresnel hologram, Hologram aperture, Image reduction, Internal structure, Point spread function(PSF), high order, holographic display, numerical aperture, self-similarity