模擬分析包含與不包含振幅資訊光學相位共軛技術於散射介質中之聚焦效果

Abstract

在本研究中，我們採用時域擬譜法（Pseudospectral Time-Domain Method, PSTD）來模擬光在散射介質中利用包含與不包含振幅資訊光學相位共軛技術（Optical Phase Conjugation, OPC）回聚的情況，並將這兩種技術分別稱為精確振幅（Exact Amplitude, EA）OPC和常數振幅（Constant Amplitude, CA）OPC。我們針對不同的散射體密度進行EAOPC和CAOPC的模擬，並對結果進行分析，以比較在不同散射條件下這兩種技術的差異。研究結果顯示，在相同的散射體數量密度下，EAOPC的表現優於CAOPC，但隨著散射體密度增加，其表現會下降。進一步的研究結果表明，CAOPC可以應用於密集介質中，但在稀疏介質中則不適用。最後，本文也討論了這些現象背後的原因。本研究為在散射介質中操控光提供了重要見解，並希望能為生物組織中的光學應用做出貢獻。

We employ the pseudospectral time-domain (PSTD) method to model light refocusing through scattering media using optical phase conjugation (OPC) with and without amplitude information, referred to as exact amplitude (EA) OPC and constant amplitude (CA) OPC, respectively. Simulations of EAOPC and CAOPC are conducted across various scatterer number densities, followed by an analysis of the results to identify the differences between the two techniques under varying scattering conditions. Our results show that EAOPC outperforms CAOPC under the same scatterer number density, but its performance declines with increasing scatterer number density. Research findings further demonstrate that CAOPC is applicable in dense media but not in sparse media. Finally, the reasons behind these phenomena are also discussed. This research provides important insights into manipulating light propagation in scattering media and hopes to advance optical applications in biological tissues.