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논문 기본 정보

자료유형
학술저널
저자정보
Nguyen Nu Hoang Anh (University of Science and Technology) Hyug-Gyo Rhee (University of Science and Technology) Pilseong Kang (Korea Research Institute of Standards and Science) Young-Sik Ghim (University of Science and Technology)
저널정보
한국광학회 Current Optics and Photonics Current Optics and Photonics Vol.6 No.1
발행연도
2022.2
수록면
44 - 50 (7page)

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초록· 키워드

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An off-axis zone plate is able to focus on a single order while neglecting the zeroth order in a visible imaging system. This allows one to enhance the contrast quality in diffractive images, which is the major advantage of this type of zone plate. However, most previous reflection zone plates are used in focusing X-rays with a small grazing incident angle and are intricately designed with the use of a local grating period. In this study, we suggest the design of an off-axis elliptical zone plate (EZP) that is used to focus a monochromatic light beam with separation between the first and unfocused orders under a large grazing incident angle of 45°. An assumption using the total grating period, which depends on the average and constant grating period, is proposed to calculate the desired distance between the first and zeroth order and to simplify the construction of a novel model off-center EZP. Four diffractive optical elements (DOEs) with different parameters were subsequently fabricated by direct laser lithography and then verified using a performance evaluation system to compare the results from the assumption with the experimental results.

목차

Ⅰ. INTRODUCTION
Ⅱ. DESIGN OF REFLECTIVE ELLIPTICAL ZONE PLATE
Ⅲ. FABRICATION PROCESS
Ⅳ. PERFORMANCE VERIFICATION
Ⅴ. CONCLUSION
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