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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Multimodal Visible-Infrared Subwavelength Structures with Decoupled Modulation of Reflection Spectra.

Yitong Zhou1, Yuqin Xiong1, Yili Liu1

  • 1State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

ACS Applied Materials & Interfaces
|April 24, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a new strategy to evaluate and achieve decoupled modulation of visible-infrared reflectivity. This enables advanced applications like dynamic displays and anticounterfeiting technologies.

Keywords:
decouplereflectivity modulationspectral modulationsubwavelength structuresvisible-infrared compatibility

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Visible-infrared reflectivity is crucial for object identity and has applications in display, camouflage, and anticounterfeiting.
  • Existing methods struggle to concisely quantify the decoupled modulation of multiple reflectivity characteristics.

Purpose of the Study:

  • To propose a systematic evaluation strategy for decoupled reflectivity modulation.
  • To present subwavelength structures capable of complex decoupled modulation of four visible-infrared reflectivity characteristics.
  • To demonstrate a multiple identity information display based on these structures.

Main Methods:

  • Development of a single quantitative indicator to assess decoupling degree and changing range.
  • Fabrication of subwavelength structures using a controllable electrochemical process.
  • Evaluation of modulation performance using the proposed strategy.

Main Results:

  • A novel evaluation strategy was successfully proposed and validated.
  • Subwavelength structures demonstrated complex decoupled modulation of four reflectivity characteristics.
  • The fabricated structures showed robustness and were suitable for device implementation.

Conclusions:

  • The proposed evaluation strategy effectively quantifies reflectivity modulation flexibility.
  • The developed subwavelength structures offer significant potential for advanced optical applications.
  • A functional multiple identity information display was successfully implemented, showcasing the practical utility of the research.