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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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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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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Updated: Jul 16, 2025

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Dirac gratings.

Shayan Saeidi, Pavel Cheben, Jens H Schmid

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    Summary
    This summary is machine-generated.

    We introduce Dirac gratings, which use Dirac functions for unique spectral properties. These gratings offer identical spectral characteristics for higher-order and first-order designs, enabling novel photonic applications.

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    Area of Science:

    • Photonics and Optics
    • Materials Science
    • Wave Phenomena

    Background:

    • Periodic structures are fundamental in optics.
    • Controlling light-matter interactions is crucial for advanced photonic devices.
    • Existing gratings have limitations in spectral control.

    Purpose of the Study:

    • To propose and theoretically validate the concept of Dirac gratings.
    • To demonstrate identical spectral characteristics for higher-order and first-order Dirac gratings.
    • To design Dirac gratings for applications like unidirectional reflectance.

    Main Methods:

    • Utilizing an inverse Fourier transform technique for grating design.
    • Employing analytical and numerical modeling.
    • Implementing Dirac gratings in dielectric stacks and silicon nanophotonic waveguides.

    Main Results:

    • Dirac gratings exhibit unique spectral properties.
    • Higher-order Dirac gratings show identical spectral characteristics to first-order gratings of the same length.
    • Designed structures operate at exceptional points, yielding unidirectional reflectance.

    Conclusions:

    • Dirac gratings offer a novel approach to spectral control in photonic systems.
    • The proposed concept is validated through analytical and numerical studies.
    • Practical implementations in dielectric stacks and silicon waveguides demonstrate feasibility.