用於屏下螢幕顯示的相位共軛超穎表面設計;Phase Conjugate Metasurface for Under Display Sensing

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题名:	用於屏下螢幕顯示的相位共軛超穎表面設計;Phase Conjugate Metasurface for Under Display Sensing
作者:	謝岳廷;Hsieh, Yueh-Ting
贡献者:	光電科學與工程學系
关键词:	超穎表面;平下螢幕顯示;相位共軛;metasurface;phase conjucate;PB phase
日期:	2022-11-25
上传时间:	2024-09-19 15:26:00 (UTC+8)
出版者:	國立中央大學
摘要:	全螢幕手機將是未來手機發展的趨勢，但受限於攝影鏡頭藏於螢幕下會因螢幕結構繞射影響，無法得到高品質的影像。本論文利用FDTD模擬分析，將彩色濾波片的週期結構簡化為光柵，設計出用於修正光柵繞射的超穎矯正器，此研究結果未來將可應用於屏下顯示系統。模擬中透過旋轉奈米鰭來調製相位，設計出與光柵相位共軛的超穎矯正器，達到消除繞射的效果。研究中得到的最佳成果是於光柵後加上PB-Phase特性設計的超穎矯正器後，第零階效率由7.34% 最高提升至86 %。最後我們也分析了超穎矯正器在使用上的對位精準度，在結構未對準之情況下，偏離半個晶胞(∆_x=165 nm)就會使效率降低15%以上;超穎矯正器偏離優化間距∆_z=±300 nm時，效率能保持在80%以上，這兩種情況在目前半導體製程技術下能夠有效克服;而入射光偏移時，偏移1度就會使效率降低15%以上，因此目前可使用在望遠鏡系統中。元件在寬頻的分析中，紅光、綠光與藍光的效率分別為86%、58%與28%。;Full-screen mobile phones will be the trend of future, but limited by the fact that the camera lens is hidden under the screen, it will be affected by the diffraction of the screen structure, and high-quality images cannot be obtained. In this paper, the FDTD simulation analysis is used to design a metacorrector to correct the diffracted light of the grating structure. The results of this research will be applied to the off-screen display system in the future. In the simulation, the phase is modulated by rotating the nanocolumn, and the phase-conjugated metasurface is designed with the grating to achieve the effect of eliminating diffraction. The best result obtained in the research is that the zeroth-order efficiency is increased from 7.34% to 86% after adding the metacorrector designed with PB-Phase characteristics behind the grating. We further investigated the efficiency variation of misalignment between metacorrector and grating. When the misalignment is in the horizontal direction, the deviation from ∆_x=165 nm (half unit cell) reduces the efficiency by 15%. When the metacorrector is away from the optimal spacing at ∆_z=±300 nm, the efficiency remains above 80%. These two situations can be effectively overcome under the semiconductor process technology. Finally, the efficiency reduces by 15% when the incident light is offset at one degree. Therefore, it can be used in telescope systems at present. In the broadband analysis of the component, the efficiency of the red, green, and blue light is 86%, 58% and 28%, respectively.
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