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학술지 Expansion of Image Space in Enhanced-NA Fresnel Holographic Display
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저자
채병규
발행일
202204
출처
Applied Sciences, v.12 no.9, pp.1-12
ISSN
2076-3417
출판사
MDPI
DOI
https://dx.doi.org/10.3390/app12094148
협약과제
22HH9100, 병리진단을 위한 편광 홀로그램 토모그래피 기술개발, 채병규
초록
The enhanced-NA Fresnel hologram reconstructs a holographic image at a viewing angle larger than the diffraction angle of a hologram pixel. The image space is limited by the bandwidth of a digital hologram. In this study, we investigate the property of image formation in the extended image space beyond a diffraction zone. A numerical simulation, using the phase Fresnel hologram, is carried out to observe an extension of image space and the effect of this on the changes in the angular field of view. The phase Fresnel hologram, synthesized by restricting the angular view range to a diffraction angle, can reconstruct a uniform image without high-order noises within the primary viewing zone, which is well confirmed by optical experiments. On the other hand, the overlapping of high-order images is inevitable, when the viewing angle depends on the hologram numerical aperture. In principle, the replica noises in both the hologram and image planes would be removed during the optimization algorithm considering suitable constraints. We discuss the development of a method for expanding the image space, while maintaining the viewing angle of a holographic image.
KSP 제안 키워드
Digital hologram, Field of view(FOV), Fresnel hologram, Image Formation, Numerical simulations, Optimization algorithm, high order, holographic display, image space, numerical aperture, uniform image
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