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Related Concept Videos

Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

323
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
323
Parallel Resonance01:23

Parallel Resonance

274
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:
274
Passive Filters01:27

Passive Filters

607
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...
607
Series Resonance01:17

Series Resonance

257
The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
257
Active Filters01:25

Active Filters

924
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:
924
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

293
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
293

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Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
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Terahertz bandstop filter using varying radii split-ring resonators.

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    This study presents a novel terahertz bandstop filter using split-ring resonators. The filter design, validated experimentally, shows promise for terahertz systems.

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    Area of Science:

    • Terahertz (THz) photonics and metamaterials.
    • Electromagnetic wave manipulation and filter design.

    Background:

    • Split-ring resonators (SRRs) are effective metamaterial structures for manipulating electromagnetic waves.
    • Terahertz (THz) frequency range presents unique challenges and opportunities for filter applications.

    Purpose of the Study:

    • To demonstrate a proof-of-concept terahertz bandstop filter using varying-radii split-ring resonators.
    • To investigate the performance of SRRs for sub-wavelength filtering in the THz regime.

    Main Methods:

    • Design and simulation of a bandstop filter comprising nine SRRs in three groups with radii 13, 14, and 15 µm.
    • Fabrication and experimental measurement of the filter's transmission response using terahertz time-domain spectroscopy (THz-TDS).

    Main Results:

    • The designed filter exhibits a combined bandstop center frequency of 1.09 THz with a -3 dB bandwidth of 0.36 THz.
    • Experimental results show good agreement with theoretical predictions and simulation data.
    • Each group of SRRs contributed distinct notch frequencies, collectively forming the bandstop response.

    Conclusions:

    • Varying-radii split-ring resonators are viable sub-wavelength elements for constructing terahertz bandstop filters.
    • The demonstrated filter design is a promising component for future terahertz systems and applications.