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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
914

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Multi-mode microcavity frequency engineering through a shifted grating in a photonic crystal ring.

Xiyuan Lu1,2, Yi Sun1,2, Ashish Chanana1

  • 1Microsystems and Nanotechnology Division, Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

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|April 29, 2024
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Summary

Shifted grating multiple mode splitting (SGMMS) offers a simple yet powerful method for frequency engineering in microcavity nonlinear optics. This technique enables multi-frequency control, crucial for nonlinear optical processes like optical parametric oscillation (OPO).

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Area of Science:

  • Photonics
  • Nonlinear Optics
  • Microcavity Devices

Background:

  • Frequency engineering of whispering-gallery resonances is critical for microcavity nonlinear optics.
  • Controlling cavity mode frequencies is essential for nonlinear optical processes.
  • Conventional methods like altering cross-sectional geometry impact all modes, while grating-assisted microrings offer mode-selective control.

Purpose of the Study:

  • To introduce a simple and effective approach for multi-frequency engineering in microring cavities.
  • To demonstrate a method that overcomes the fabrication complexity of multi-period gratings.
  • To enable nonlinear optical processes in devices not typically suited for them.

Main Methods:

  • Developed a technique termed shifted grating multiple mode splitting (SGMMS).
  • Introduced spatial displacement of a single-period grating on the microring's inner boundary.
  • Created rotational asymmetry to frequency split multiple adjacent cavity modes.

Main Results:

  • SGMMS provides multi-frequency engineering with simple implementation and no added fabrication complexity.
  • Demonstrated the ability to engineer frequencies of multiple adjacent cavity modes.
  • Enabled optical parametric oscillation (OPO) across a wide range of pump wavelengths in a normal-dispersion device.

Conclusions:

  • SGMMS is a powerful and easily implementable technique for multi-frequency engineering in nonlinear optics.
  • This method simplifies the complex grating profiles previously required for multi-frequency control.
  • SGMMS expands the applicability of microcavity devices for nonlinear optical applications, such as OPO in normal-dispersion regimes.