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通过散射介质塑造的高收益和高速波线

Zhongtao Cheng¹, Chengmingyue Li¹, Anjul Khadria¹

¹Caltech Optical Imaging Laboratory, Andrew and Peggy Cherng Department of Medical Engineering, Department of Electrical Engineering, California Institute of Technology, Pasadena, California 91125, USA.

Nature photonics

|June 19, 2023

概括

本研究介绍了一种新的波面塑造 (WFS) 技术,可以克服通过散射介质控制光线的局限性. 它可以同时实现高速,能量增益和控制自由度,用于先进的光子学应用.

科学领域:

光学和光子学在光学和光子学.
生物医学光学生物医学光学
材料科学材料科学材料科学

背景情况:

波面造型 (WFS) 对于聚焦光在散射介质中至关重要.
目前的WFS方法面临的是速度,能量增益和自由度 (DOF) 之间的权衡.
局限性阻碍了WFS在动态和高度散射样本中的应用.

研究的目的:

开发一种WFS技术,同时优化速度,能量增益和DOF.
克服现有的WFS技术的局限性.
为了实现先进的光学和现实世界的WFS应用.

主要方法:

结合光折射晶体基础的模拟光学相联 (AOPC) 与受刺激的发射光放大.
利用一种新的方法来增强能量增益和控制模式.
在~10^6控制模式下实现了大约10μs的响应时间.

主要成果:

实现了接近统一的能量增益,明显高于传统的AOPC.
证明了~10μs的响应时间,使高速WFS成为可能.
实现了~10^6的控制模式,提供高的DOF.
实现了~0.01 ns/mode的平均模式时间,超过了当前快速WFS系统.

结论:

开发的WFS技术同时提供高速,高能量增益和高DOF.
这一进步克服了当前WFS方法中的关键权衡.
该技术有望通过克服光学扩散极限并实现现实世界WFS应用来推进光子学.

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$Interference and Diffraction$ 02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

Standing Waves in a Cavity

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by: