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Light as Energy01:35

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The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
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The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Related Experiment Video

Updated: May 2, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Light People: Professor Manijeh Razeghi.

Hui Wang1, Cun Yu2

  • 1Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, China. wangh@ciomp.ac.cn.

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Summary

Professor Manijeh Razeghi explores diverse light spectrums, from deep ultraviolet to terahertz waves, using quantum semiconductor technology. Her research spans the entire process from materials to applications, inspiring future scientists.

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Area of Science:

  • * Physics and Materials Science: Investigating the electromagnetic spectrum beyond visible light.
  • * Quantum Semiconductor Technology: Developing advanced materials for light detection and emission.

Background:

  • * Visible light perception is limited, yet the electromagnetic spectrum holds vast potential for scientific exploration and technological advancement.
  • * Professor Manijeh Razeghi is a leading researcher at Northwestern University, dedicated to expanding our understanding and application of light across various spectral bands.

Purpose of the Study:

  • * To explore and harness the potential of light across a wide spectrum, including deep ultraviolet and terahertz waves.
  • * To advance quantum semiconductor technology for novel device applications.
  • * To foster a holistic approach to scientific research, encompassing material selection, device design, manufacturing, and application.

Main Methods:

  • * Research encompasses material selection, device design, processing, and manufacturing of quantum semiconductor devices.
  • * Exploration of spectral bands ranging from deep ultraviolet to terahertz waves.
  • * Focus on the complete research and development lifecycle for technological innovation.

Main Results:

  • * Pioneering research in diverse spectral bands of light, from deep ultraviolet to terahertz waves.
  • * Advancements in quantum semiconductor technology enabling new device functionalities.
  • * Comprehensive approach integrating fundamental research with practical applications.

Conclusions:

  • * The study highlights the critical importance of exploring the full light spectrum for scientific discovery and technological progress.
  • * Professor Razeghi's work exemplifies a pioneering spirit and a commitment to advancing quantum semiconductor technology.
  • * Encourages a passion-driven approach to research and emphasizes the potential of female scientists.