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Related Concept Videos

Parallel Resonance01:23

Parallel Resonance

248
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:
248
Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

354
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...
354
Sound Waves: Resonance01:14

Sound Waves: Resonance

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Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
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Series Resonance01:17

Series Resonance

232
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...
232
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

294
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:
294
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

260
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...
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Nonreciprocal Frequency Conversion and Mode Routing in a Microresonator.

Zhen Shen1,2, Yan-Lei Zhang1,2, Yuan Chen1,2

  • 1CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, People's Republic of China.

Physical Review Letters
|January 20, 2023
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Researchers broke reciprocity in light (photon) and sound (phonon) transport using a microresonator. This enables nonreciprocal devices, including novel photon-to-photon routing with large frequency differences.

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Area of Science:

  • Quantum optics
  • Optomechanics
  • Condensed matter physics

Background:

  • The principle of reciprocity governs photon and phonon transport.
  • Breaking reciprocity is key for developing nonreciprocal devices like isolators and circulators.
  • Optomechanical systems offer a platform for manipulating light and sound interactions.

Purpose of the Study:

  • To demonstrate phase-controlled nonreciprocal routing of photons and phonons in a single microresonator.
  • To achieve nonreciprocal photon-to-photon routing with a significant frequency difference.
  • To realize a phononic circulator within an optomechanical system.

Main Methods:

  • Utilizing a microresonator with two optical and two mechanical modes to form a four-mode plaquette.
  • Employing radiation pressure force to couple the optical and mechanical modes.
  • Leveraging interference between multimode transfer processes in optomechanical interactions.

Main Results:

  • Demonstrated phase-controlled nonreciprocal routing between modes of different frequencies (phonon-phonon, photon-phonon).
  • Achieved, for the first time, nonreciprocal photon-to-photon routing with an 80 THz frequency difference.
  • Introduced an additional mechanical mode to realize a phononic circulator in the single microresonator.

Conclusions:

  • The study establishes nonreciprocal routing of photons and phonons within a single optomechanical resonator.
  • It demonstrates nonreciprocal frequency conversion for photons and circulation for phonons.
  • This work provides a foundation for directional routing and thermal management in optomechanical hybrid networks.