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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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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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Related Experiment Video

Updated: May 3, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Multimode interface between optical free-space and waveguide modes.

Teresia Stranden, Oussama Korichi, Matias Eriksson

    Optics Letters
    |May 1, 2026
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    Summary
    This summary is machine-generated.

    Researchers developed an efficient interface to convert free-space Laguerre-Gauss (LG) modes to waveguide modes. This technology enhances data capacity for optical communication networks.

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    The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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    Area of Science:

    • Photonics and Optical Communications
    • Integrated Optics
    • Waveguide Technology

    Background:

    • Free-space and on-chip photonic systems are crucial for optical communication.
    • Bridging free-space mode manipulation and integrated waveguide stability is vital for scalable networks.
    • Higher-order spatial modes offer potential for increased data transmission capacity.

    Purpose of the Study:

    • To develop an efficient, broadband interface for converting free-space Laguerre-Gauss (LG) modes to waveguide modes.
    • To demonstrate low-crosstalk mode conversion for multi-mode optical communication.
    • To enable compact and efficient on-chip processing schemes for optical networks.

    Main Methods:

    • Utilized the multi-plane light conversion (MPLC) scheme for mode conversion.
    • Experimentally demonstrated conversion between sets of three LG modes and the first three TE modes.
    • Operated the system passively across the telecom C-band within a multimode silicon waveguide.

    Main Results:

    • Achieved efficient and broadband conversion of multiple higher-order free-space LG modes to waveguide modes.
    • Demonstrated low-crosstalk mode conversion between specific LG and TE mode sets.
    • Validated passive operation without active switching, adaptable to different spatial mode sets.

    Conclusions:

    • The developed interface efficiently bridges free-space and on-chip photonic systems.
    • This technology offers a pathway to significantly increased data capacities in optical communication.
    • The platform enables more compact and efficient multi-mode optical communication and on-chip processing.