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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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...
Standing Waves in a Cavity01:28

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
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Wavelength-insensitive couplers using dispersive materials.

K Morishita, M S Yataki, W A Gambling

    Optics Letters
    |September 11, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Optical coupler performance can be wavelength-independent by selecting materials with specific dispersive properties. This study calculates coupling coefficients for dispersive waveguides, comparing them to non-dispersive ones.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Optical couplers are fundamental components in photonic integrated circuits.
    • Wavelength sensitivity of the coupling coefficient can limit device performance.

    Purpose of the Study:

    • To demonstrate wavelength-insensitivity in optical coupler performance.
    • To investigate the role of material dispersion in controlling optical coupling.

    Main Methods:

    • Calculation of the coupling coefficient for dispersive slab waveguides.
    • Comparison of coupling coefficients between dispersive and non-dispersive waveguide models.

    Main Results:

    • The coupling coefficient can be rendered insensitive to wavelength through careful material selection.
    • Dispersive materials offer a method to control and stabilize optical coupling.

    Conclusions:

    • Material dispersion is a key factor in designing wavelength-stable optical couplers.
    • This approach enables the development of more robust and reliable photonic devices.