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Related Concept Videos

Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

404
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:
404
Parallel Resonance01:23

Parallel Resonance

388
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:
388
Series Resonance01:17

Series Resonance

417
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...
417
Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

507
Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...
507
Resonance in an AC Circuit01:26

Resonance in an AC Circuit

2.3K
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...
2.3K
Series RLC Circuit without Source01:21

Series RLC Circuit without Source

2.1K
Within the field of electrical circuits, source-free RLC circuits present an intriguing domain. These circuits comprise a series arrangement of a resistor, inductor, and capacitor, operating independently of external energy sources. Their initiation hinges upon utilizing the initial energy stored within the capacitor and inductor to instigate their functionality. Their mathematical equation, a second-order differential equation, sets these circuits apart. This equation captures how the...
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Fabrication of Silica Ultra High Quality Factor Microresonators
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Universal light-guiding geometry for on-chip resonators having extremely high Q-factor.

Dae-Gon Kim1,2, Sangyoon Han1,3, Joonhyuk Hwang1

  • 1Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea.

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Researchers developed a universal method for creating ultra-high-Q optical resonators from new materials. This technique enables low-threshold lasing in integrated photonic devices, advancing on-chip photonics.

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Area of Science:

  • Photonics
  • Materials Science
  • Optical Engineering

Background:

  • High-Q optical resonators are crucial for nonlinear integrated photonics.
  • Fabricating smooth resonators from novel materials on-chip remains a significant challenge.

Purpose of the Study:

  • To develop a universal fabrication method for ultra-high-Q resonators using novel materials.
  • To demonstrate the efficacy of this method with high-nonlinearity chalcogenide glass (As2S3).

Main Methods:

  • A universal method for implementing ultra-high-Q resonators with materials deposited by physical vapor deposition.
  • Automatic creation of light-guiding cores with molecular-scale surface roughness on pre-patterned substrates.
  • Verification using As2S3, a chalcogenide glass.

Main Results:

  • Achieved Q-factor for As2S3 resonators approaching propagation loss records in chalcogenide fibers.
  • Demonstrated lasing by stimulated Brillouin scattering with a 100x lower threshold power than previous records.
  • Created resonators with molecular-scale surface smoothness.

Conclusions:

  • The developed method enables the creation of ultra-high-Q resonators from diverse materials for integrated photonics.
  • This advancement significantly lowers the threshold power for stimulated Brillouin scattering lasing.
  • The technique paves the way for enhanced nonlinear optical devices on-chip.