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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Nonconservative Coupling in a Passive Silicon Microring Resonator.

H Du1, X Zhang2, C G Littlejohns1,3

  • 1Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, United Kingdom.

Physical Review Letters
|January 25, 2020
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Summary

Researchers demonstrated adjustable nonconservative coupling in silicon microrings, controlling resonance modes. This breakthrough enables new possibilities for on-chip lasers and quantum photonics applications.

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Area of Science:

  • Photonics and optical engineering
  • Quantum information science
  • Materials science

Background:

  • Silicon microrings are fundamental components in integrated photonics.
  • Controlling light-matter interactions in microring resonators is crucial for advanced optical devices.
  • Nonconservative coupling offers novel ways to manipulate resonance modes.

Purpose of the Study:

  • To investigate and demonstrate nonconservative coupling between clockwise and counterclockwise resonance modes in a passive silicon microring.
  • To show that the coupling coefficient can be dynamically adjusted.
  • To explore the implications for fundamental studies and applications in quantum photonics and on-chip lasers.

Main Methods:

  • Theoretical prediction of supermode resonance phenomena.
  • Experimental implementation using a passive silicon microring resonator.
  • Utilizing a thermo-optic phase shifter to tune the coupling coefficient.

Main Results:

  • Demonstration of adjustable nonconservative coupling between microring resonance modes.
  • Experimental validation of theoretically predicted supermode resonances.
  • Successful control over the coupling strength via thermo-optic tuning.

Conclusions:

  • Nonconservative coupling in silicon microrings is feasible and controllable.
  • This technique provides a new platform for fundamental research in photonics.
  • Opens avenues for developing advanced on-chip lasers and quantum photonic devices.