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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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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 Frequency Region: X–H Stretching01:24

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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IR Spectroscopy: Molecular Vibration Overview01:24

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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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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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Upconversion optical entropy encoding for infrared complex-amplitude imaging.

Sheng-Ke Zhu1, Tuqiang Pan2,3, Chao-Xian Tang1

  • 1Institute of Electromagnetics and Acoustics, Key Laboratory of Electromagnetic Wave Science and Detection Technology, Xiamen University, Xiamen, China.

Light, Science & Applications
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Summary
This summary is machine-generated.

Researchers developed a new infrared imaging system using upconversion optical entropy encoding. This breakthrough enables real-time complex-amplitude imaging, capturing both phase and amplitude information at video rates.

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Area of Science:

  • Photonics and Imaging Science
  • Optoelectronics
  • Deep Learning Applications

Background:

  • Upconversion detection using silicon photodetectors has advanced infrared imaging.
  • Current systems struggle with real-time, complex-amplitude imaging (phase and amplitude).
  • This limits the full potential of infrared scene analysis.

Purpose of the Study:

  • To develop a video-rate infrared complex-amplitude imaging system.
  • To overcome limitations in real-time phase and amplitude information capture.
  • To enhance infrared imaging capabilities for diverse applications.

Main Methods:

  • Proposed upconversion optical entropy encoding by integrating coherent and incoherent approaches.
  • Leveraged light scattering in disordered photonic structures and lanthanide upconversion photoluminescence.
  • Utilized a deep learning network for reconstruction of infrared light-field information from visible snapshots.

Main Results:

  • Demonstrated a video-rate (25 fps) infrared complex-amplitude imaging system.
  • Achieved high-fidelity 8-bit grayscale modulation.
  • Reached a power detection limit of 0.2 nW μm⁻², significantly improving photosensitivity.

Conclusions:

  • The developed system enables real-time, high-fidelity infrared complex-amplitude imaging.
  • Potential applications include natural scene imaging and autonomous driving sign classification.
  • The approach is versatile and can be integrated with other cross-band imaging methods.