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Related Concept Videos

Passive Filters01:27

Passive Filters

521
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
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
521
Active Filters01:25

Active Filters

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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:
786
Parallel Resonance01:23

Parallel Resonance

187
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
187
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

871
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:
871
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

291
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
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Absorptive frequency-selective transmission/reflection metamaterials with angular-insensitive and switchable octave

Zhao Tang, Jie Xu, Dong-Rui Yuan

    Optics Express
    |November 14, 2024
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    This summary is machine-generated.

    New metamaterials achieve switchable octave absorption, insensitive to angle. These advanced materials offer tunable double to fivefold absorption, with applications in electromagnetic computing and radar cross-section reduction.

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    Area of Science:

    • Metamaterials and Nanophotonics
    • Electromagnetics and Optics

    Background:

    • Metamaterials offer unique electromagnetic properties.
    • Achieving angular-insensitive and switchable absorption remains a challenge.

    Purpose of the Study:

    • To propose and demonstrate novel absorptive frequency-selective transmission/reflection (AFST/AFSR) metamaterials.
    • To achieve angular-insensitive and switchable octave absorption using yttrium-iron-garnet embedded metamaterials.

    Main Methods:

    • Utilized the season optimization algorithm to optimize metamaterial structural parameters.
    • Applied discrete decreasing magnetic fields to tune absorption characteristics.
    • Incorporated reflection layers to achieve Janus characteristics for bidirectional wave handling.

    Main Results:

    • Demonstrated angular-insensitive octave absorption up to 53° for TE waves.
    • Achieved switchable absorption, tunable from double to fivefold.
    • Realized a Janus AFSR metamaterial with bidirectional angular-insensitive and switchable octave absorption.

    Conclusions:

    • The proposed AFST/AFSR metamaterials provide a novel approach to angular-insensitive and switchable octave absorption.
    • These metamaterials exhibit significant application potential in electromagnetic computing, RCS reduction, and information processing.