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Related Concept Videos

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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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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X-ray Crystallography02:18

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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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Crystal Field Theory
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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Dirac cones with zero refractive indices in phoxonic crystals.

Linlin Lei, Tianbao Yu, Wenxing Liu

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    |February 24, 2022
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    This study demonstrates simultaneous zero refractive indices for sound and light using a 2D phoxonic crystal. This breakthrough enables novel applications in acousto-optic cloaking and unidirectional transmission.

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    Area of Science:

    • Acousto-optics
    • Condensed Matter Physics
    • Materials Science

    Background:

    • Zero refractive index (ZRI) materials offer unique wave manipulation properties.
    • Previous attempts to achieve simultaneous acoustic and optical ZRI faced limitations, particularly with high-frequency phononic modes.

    Purpose of the Study:

    • To realize simultaneous zero refractive indices for both sound and light.
    • To explore novel applications such as acousto-optic cloaking and unidirectional transmission.

    Main Methods:

    • Utilizing a 2D triangular lattice phoxonic crystal (PxC) with C6v symmetry.
    • Investigating low-frequency phononic Dirac cones at the K point of the Brillouin zone.
    • Employing zone folding to understand acoustic ZRI mechanisms.
    • Tuning photonic Dirac-like cones via geometric parameters and high-contrast permittivity.

    Main Results:

    • Achieved simultaneous low-frequency Dirac dispersions for both phononic and photonic modes.
    • Demonstrated the PxC's capability to act as a zero-index material for both sound and light concurrently.
    • Numerically verified acousto-optic synchronous cloaking and unidirectional transmission.

    Conclusions:

    • A novel mechanism for simultaneous sound and light control has been established.
    • The developed phoxonic crystal provides a platform for advanced acousto-optic devices.
    • This research opens new avenues for manipulating wave phenomena in coupled systems.