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Related Concept Videos

IR Spectrum01:19

IR Spectrum

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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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IR Spectrometers01:25

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Related Experiment Video

Updated: May 24, 2025

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A Triband Metasurface Covering Visible, Midwave Infrared, and Long-Wave Infrared for Optical Security.

Qixiang Chen1, Xuemei Huang2, Zezhao Ju3

  • 1School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, China.

Nano Letters
|March 4, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel triband metasurface for advanced optical security. This technology enables synchronized encryption across visible, midwave infrared, and long-wave infrared bands, enhancing anticounterfeiting measures.

Keywords:
AnticounterfeitingAtmospheric windowInfrared camouflageOptical securityPhotonic structureSelective thermal emission

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Information Security

Background:

  • Optical security methods are advancing, with dual-band encryption in visible (VIS) and infrared (IR) bands established.
  • Synchronized optical security across VIS, midwave infrared (MWIR), and long-wave infrared (LWIR) bands presents a significant challenge.

Purpose of the Study:

  • To experimentally demonstrate a triband metasurface for synchronized optical security across VIS, MWIR, and LWIR bands.
  • To explore novel approaches for enhancing optical security and anticounterfeiting applications.

Main Methods:

  • Fabrication and characterization of a triband metasurface.
  • Utilizing structural color for VIS imaging.
  • Employing selective emissivity structures for MWIR and LWIR imaging.
  • Validation of information encoding and encryption capabilities.

Main Results:

  • Successful demonstration of a triband metasurface covering VIS, MWIR, and LWIR bands.
  • VIS imaging achieved via structural color.
  • MWIR/LWIR imaging achieved through selective emissivity (MWIR/LWIR: 0.81/0.17 and 0.21/0.83 respectively).
  • Complete hiding of MWIR and LWIR information within the VIS band.
  • Validation of complex information encoding and information-misleading encryption.

Conclusions:

  • The triband metasurface offers a new paradigm for synchronized optical security across multiple spectral bands.
  • This technology holds significant potential for anticounterfeiting and thermal camouflage applications.
  • Introduces novel approaches for advanced optical encryption and information security.