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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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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Parallel Resonance01:23

Parallel Resonance

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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:
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Design Example: Capacitance Multiplier Circuit01:20

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
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Updated: Jul 1, 2025

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Multimodality integrated microresonators using the Moiré speedup effect.

Qing-Xin Ji1, Peng Liu1, Warren Jin2,3

  • 1T. J. Watson Laboratory of Applied Physics, Caltech, Pasadena, CA 91125, USA.

Science (New York, N.Y.)
|March 7, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a Moiré speedup dispersion tuning method for high-Q microresonators. This innovation allows a single device to switch between Brillouin laser, bright microcomb, and dark microcomb modes on demand, enhancing photonic integrated circuits.

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Area of Science:

  • Photonics
  • Integrated Optics
  • Microresonator Technology

Background:

  • High-Q microresonators are crucial for photonic integrated circuits but have fixed operational modes post-fabrication.
  • Reconfiguring microresonator modes typically requires redesigning the physical geometry, limiting device versatility.

Purpose of the Study:

  • To introduce a novel Moiré speedup dispersion tuning method for reconfigurable microresonator operation.
  • To demonstrate on-demand switching between multiple operational modes within a single hybrid-integrated device.

Main Methods:

  • Utilized Vernier coupled rings for electrical tuning.
  • Implemented a Moiré speedup dispersion tuning technique.
  • Employed a single-pump wavelength for mode switching.

Main Results:

  • Successfully switched between Brillouin laser, bright microcomb, and dark microcomb modes using the same device.
  • Demonstrated Brillouin phase matching and microcomb operation across the telecom C-band.
  • Achieved flexible mixed-mode operation with on-demand modality switching.

Conclusions:

  • The proposed Moiré speedup dispersion tuning method enables unprecedented operational flexibility in microresonator devices.
  • A single universal microresonator design can now serve diverse applications, reducing complexity and cost.
  • This advancement significantly enhances the capabilities of integrated photonic circuits with reconfigurable mixed-mode operation.