近轴近似
角动量
光学
波前
物理
折射率
光的轨道角动量
光束
轨道角动量复用
相(物质)
散射
高斯光束
旋涡
相位调制
梁(结构)
总角动量
量子力学
相位噪声
作者
Igor Meglinski,Ivan Lopushenko,Anton Sdobnov,Alexander Bykov
标识
DOI:10.1038/s41377-024-01562-7
摘要
Abstract Recent advancements in wavefront shaping techniques have facilitated the study of complex structured light’s propagation with orbital angular momentum (OAM) within various media. The introduction of spiral phase modulation to the Laguerre–Gaussian (LG) beam during its paraxial propagation is facilitated by the negative gradient of the medium’s refractive index change over time, leading to a notable increase in the rate of phase twist, effectively observed as phase retardation of the OAM. This approach attains remarkable sensitivity to even the slightest variations in the medium’s refractive index ( ∼ 10 − 6 ). The phase memory of OAM is revealed as the ability of twisted light to preserve the initial helical phase even propagating through the turbid tissue-like multiple scattering medium. The results confirm fascinating opportunities for exploiting OAM light in biomedical applications, e.g. such as non-invasive trans-cutaneous glucose diagnosis and optical communication through biological tissues and other optically dense media.
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