Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Novel Optimization Method of Phase-Only Computer-Generated Hologram Using the Phase-Shift Characteristic

위상천이특성을 이용한 새로운 Phase-Only CGH 계산

  • Kim, Tae-Hyeon (Department of Electronic Engineering, Inha University) ;
  • Kim, Bong-Sik (Department of Electronic Engineering, Inha University) ;
  • Park, Woo-Sang (Department of Electronic Engineering, Inha University)
  • 김태현 (인하대학교 전자공학과) ;
  • 김봉식 (인하대학교 전자공학과) ;
  • 박우상 (인하대학교 전자공학과)
  • Received : 2016.04.22
  • Accepted : 2016.06.09
  • Published : 2016.06.25
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Abstract

In this study we propose the novel optimization method of the phase-only computer-generated hologram (CGH), to improve calculation speed compared to the conventional method. While the conventional method is calculated using numerical analysis, the novel method is calculated using the phase-shift characteristic of Fourier transformation. In addition, the selectivity of noise filtering lets it decrease the calculation time. The validity of the reconstructed image using the novel method is verified by comparing simulation results to ideal and conventional data, and the improvement of texture and sharpness of the reconstructed image is confirmed by simulation.

본 논문에서는 푸리에 변환의 위상천이 특성을 이용하여 기존의 계산방법보다 처리 속도가 빠르고, 이상적인 CGH의 재생이미지와의 차이가 크지 않은 Phase-only CGH의 새로운 최적화 계산방법을 제시한다. 기존의 수치적인 해를 얻는 접근과는 다르게 푸리에 변환 자체의 위상천이 특성을 이용하여 노이즈를 선택적으로 필터링하는 방법으로 Phase-only CGH를 얻기 때문에 계산속도를 현저하게 줄일 수 있다. 이상적인 CGH와 기존의 방법, 그리고 새로운 계산방법을 통한 CGH를 시뮬레이션을 통하여 각각 SLM에 저장하여 수렴렌즈를 이용한 푸리에 홀로그램 방식으로 이미지를 재생하였다. 그리고 시뮬레이션 재생 이미지를 비교하여 본 연구의 타당성을 살펴보았다. 기존의 방법과 비교하였을 때, 이미지 물체의 질감과 예리도가 이상적인 CGH와 비슷한 정도의 수준으로 향상되었고, 계산속도 또한 크게 줄었음을 알 수 있다.

Keywords

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