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Related Concept Videos

Series Resonance01:17

Series Resonance

215
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...
215
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

656
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
656
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

17.0K
According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
17.0K
Parallel Resonance01:23

Parallel Resonance

233
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:
233
Resonance in an AC Circuit01:26

Resonance in an AC Circuit

2.1K
The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...
2.1K
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

282
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:
282

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Related Experiment Video

Updated: Jul 25, 2025

Fabrication of Silica Ultra High Quality Factor Microresonators
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Hydroxyl ion absorption in on-chip high-Q resonators.

Lue Wu, Maodong Gao, Jin-Yu Liu

    Optics Letters
    |June 30, 2023
    PubMed
    Summary

    This study quantifies optical loss in thermal silica, a key material for silicon photonics. Researchers used high-quality microresonators to measure hydroxyl ion absorption, revealing low loss levels critical for advanced optical circuits.

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    Area of Science:

    • Materials Science
    • Photonics
    • Optical Engineering

    Background:

    • Thermal silica is a prevalent dielectric in silicon photonics.
    • Optical loss in thermal silica is often attributed to bound hydroxyl ions (Si-OH).
    • Quantifying hydroxyl ion absorption is crucial for optimizing optical circuit performance.

    Purpose of the Study:

    • To precisely measure hydroxyl ion absorption loss in thermal silica.
    • To distinguish OH absorption from scattering loss in microresonators.
    • To determine hydroxyl ion concentration using optical measurements.

    Main Methods:

    • Fabrication of ultra-high-quality factor (Q-factor) thermal-silica wedge microresonators.
    • Measurement of optical loss spectra from 680 nm to 1550 nm.
    • Secondary Ion Mass Spectrometry (SIMS) depth profiling for material analysis.

    Main Results:

    • Record-high on-chip resonator Q-factors were achieved in near-visible and visible wavelengths.
    • The absorption-limited Q-factor reached 8 billion in the telecom band.
    • Hydroxyl ion content was inferred to be approximately 2.4 ppm (weight).

    Conclusions:

    • Hydroxyl ion absorption is a quantifiable loss mechanism in thermal silica.
    • High-Q resonators enable precise measurement of optical loss in photonic materials.
    • The low inferred hydroxyl content suggests potential for ultra-low loss silicon photonic devices.