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Related Concept Videos

Boundary Conditions: Lossless Lines01:21

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Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
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In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi,...
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Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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Tunable bound states in the continuum with loss compatibility.

Haoqi Luo, Liangliang Liu, Junyu Zhang

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    |January 29, 2025
    PubMed
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    This study introduces a novel method for actively controlling bound states in the continuum (BICs) using tunable materials. The technique allows for manipulation of BIC dynamics and chiroptical effects, even with material loss, preserving high quality factors.

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    Area of Science:

    • Photonics
    • Metamaterials
    • Optical Engineering

    Background:

    • Conventional bound states in the continuum (BICs) devices rely on passive structural geometries.
    • Achieving dynamic control over BICs typically requires complex designs and often results in passive devices.
    • Introducing tunable materials offers a path toward active and reconfigurable BIC metadevices.

    Purpose of the Study:

    • To develop a loss-compatible mechanism for manipulating bound states in the continuum (BICs).
    • To demonstrate active control over BIC dynamics and chiroptical effects in photonic systems.
    • To explore the role of material loss in BIC manipulation while maintaining ultrahigh Q factors.

    Main Methods:

    • Utilized far-field interference in a mirror-assisted photonic crystal slab.
    • Employed materials with tunable permittivity (refractive index and loss) undergoing amorphous-crystalline phase transitions.
    • Performed simulations to analyze the modulation of BIC properties and chiroptical effects.

    Main Results:

    • Demonstrated a loss-compatible BIC manipulation mechanism where material loss coexists with ultrahigh Q factor.
    • Showcased active switching of topological charge for BICs via material property modulation.
    • Achieved multidimensional control of chiroptical effects for quasi-BICs, including steerable directionality and a wide chirality continuum.

    Conclusions:

    • The findings present a new route for constructing active BIC metadevices.
    • This work highlights the potential of intrinsic material loss for dynamic control in ultrahigh-Q photonic systems.
    • The developed mechanism enables active functionalities and deeper exploration of loss-driven BIC dynamics.