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Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

360
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
360
Carrier Generation and Recombination01:22

Carrier Generation and Recombination

560
Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
560

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相关实验视频

Updated: Jun 23, 2025

Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
09:57

Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

Published on: July 25, 2022

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在纳卡加米上空使用RIS辅助的D2D通信-m 随着RSMA的消失而消失.

Yunhao Ding1, Linfei Chen2,3, Peishun Yan1

  • 1School of Information Science and Technology, Nantong University, Nantong 226019, China.

Sensors (Basel, Switzerland)
|June 19, 2024
PubMed
概括

这项研究提高了可重新配置的智能表面 (RIS) 辅助的设备对设备 (D2D) 通信可靠性,使用率分割多重访问 (RSMA). 拟议的系统实现了更高的可实现的 ergodic 速率,优于现有方法.

关键词:
纳卡加米的频道正在色.可以实现的 ergodic 速率.最大的比率组合 (MRC)价格分割多重访问 (RSMA)可重新配置的智能表面 (RIS)

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Observation and Analysis of Blinking Surface-enhanced Raman Scattering
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Observation and Analysis of Blinking Surface-enhanced Raman Scattering

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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

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Observation and Analysis of Blinking Surface-enhanced Raman Scattering
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科学领域:

  • 无线通信系统无线通信系统
  • 信号处理 信号处理
  • 信息理论 信息理论

背景情况:

  • 设备对设备 (D2D) 通信提供了直接的设备交互,提高了光谱效率.
  • 可重新配置的智能表面 (RIS) 可以智能控制无线传播环境.
  • 纳卡加米-m色通道代表了无线通道条件的多功能模型.

研究的目的:

  • 调查RIS辅助D2D通信系统在Nakagami-m色通道上的性能.
  • 为了提高RIS辅助D2D系统的可靠性和可实现的ergodic率.
  • 应用分速多重访问 (RSMA) 来提高系统性能.

主要方法:

  • 使用率分割多重访问 (RSMA) 来管理常用和私有符号.
  • 分析了RIS和D2D连接的可实现的ergodic速率.
  • 在目的地使用最大比率组合 (MRC) 进行联合符号解码.

主要成果:

  • 导出了一个封闭式的表达式来表示可实现的ergodic速率.
  • 研究了电力分配的影响和RIS元素的数量.
  • 证明了分析和模拟结果之间的密切匹配.

结论:

  • 拟议的RSMA的RIS辅助D2D系统显著提高了可实现的ergodic率.
  • 系统性能对功率分配和反射元件的数量是敏感的.
  • 这种方法在现有通信系统设计上显示出优越性.