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Phase Contrast and Differential Interference Contrast Microscopy

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...

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Updated: Feb 26, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

广角极化-使用相变材料的独立6位光学调制器.

Atchyut Phalgun Malireddi¹, Suresh Chejarla², Srini Krishnamurthy^3,4

¹Advanced Memory and Computing Research Centre, Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, India 600036.

|February 25, 2026

概括

此摘要是机器生成的。

本研究介绍了一种使用相变材料 (Ge2Sb1Te4) 的新型反射光学调制器,用于高效的自由空间光学通信. 它实现了87%的调制深度和6位多层编码,用于高密度数据传输.

关键词:

波长为1550纳米的波长.多层次编程多层次编程阶段变化材料阶段变化材料可重新配置的可重新配置.有反射光学调制器的反射光学调制器

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相关实验视频

Last Updated: Feb 26, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Published on: January 28, 2019

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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科学领域:

光子学和光学工程的工程.
材料科学材料科学材料科学
光学通信系统光学通信系统

背景情况:

反射光学调制器对于自由空间光学通信至关重要.
主要挑战包括实现高调制深度的角度,波长和偏振独立性.

研究的目的:

介绍一种基于相变材料 (Ge2Sb1Te4) 的新型反射光学调制器.
展示高级光学数据传输的高调制深度和多级编码能力.

主要方法:

将Ge2Sb1Te4集成到一个用SiNx.封顶的平面腔中.
利用材料的折射率 (Δn ≈ 3.44, Δk ≈ 1.3) 和低吸收率 (k ≈ 0.03) 的显著变化.
控制光学刺激以实现离散的反射率状态.

主要成果:

在接近正常的发射频率下,为1550nm光的调制深度 (ΔR) 达到87%.
在无形和晶体相之间实现了64个离散的反射状态.
证明了用于高密度光学数据传输的6位多层编码.

结论:

基于Ge2Sb1Te4的调制器为高性能光通信提供了一个有前途的解决方案.
该设备实现了高调制深度和多级编码,没有元表面或等离子体结构.
这项技术可实现高效,高密度的光学数据传输.