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Related Concept Videos

Passive Filters01:27

Passive Filters

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
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Active Filters01:25

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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Dynamic Equilibrium

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A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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Additional Subnuclear Structures

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The eukaryotic nucleus is a double membrane-bound organelle that contains nearly all of the cell’s genetic material in the form of chromosomes. It is rightly called the “brain” of the cell as it shoulders the responsibility of responding to various physiological processes, stress, altered metabolic conditions, and other cellular signals. 
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Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Structural Isomerism

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Isomerism in Complexes
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Template Directed Synthesis of Plasmonic Gold Nanotubes with Tunable IR Absorbance
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Plasmonic metamaterial-based filtering structures with dynamic tunability.

Nidhi Pandit, Rahul Kumar Jaiswal, Nagendra Prasad Pathak

    Optics Letters
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    Summary
    This summary is machine-generated.

    This study presents tunable plasmonic metamaterial filters with adaptable bandwidths. These novel multi-mode filtering structures offer enhanced selectivity for future plasmonic circuits.

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    Area of Science:

    • Photonics and Nanotechnology
    • Metamaterials and Plasmonics

    Background:

    • Plasmonic metamaterials offer unique optical properties for advanced filtering.
    • Existing filters often lack dynamic tunability and high selectivity.

    Purpose of the Study:

    • To design, analyze, and characterize first- and second-order plasmonic metamaterial multi-mode filters.
    • To introduce and demonstrate electronic adaptivity in filter transfer functions for dynamic bandwidth tuning.

    Main Methods:

    • Theoretical design and analysis of multi-mode resonator-based bandpass filters.
    • Integration of semiconductor varactor diodes for electronic tuning of filter bandwidth.
    • Fabrication and experimental characterization of filter prototypes using Keysight analyzer N9918A.

    Main Results:

    • Successful demonstration of first- and second-order plasmonic metamaterial multi-mode filters.
    • Characterization of electronic adaptivity, enabling dynamic bandwidth tuning.
    • Enhanced selectivity and out-of-band filtering response achieved with second-order designs.

    Conclusions:

    • The developed filtering structures are crucial for tunable plasmonic circuits and systems.
    • Electronic adaptivity in plasmonic filters opens new avenues for dynamic signal processing.