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Area of Science:

  • Optics
  • Photonics
  • Materials Science

Background:

  • Optical cavities typically transmit light at discrete frequencies.
  • Achieving broadband resonance in planar micro-cavities has been a significant challenge.
  • Previous methods confined cavity benefits like resonant field buildup to narrow linewidths.

Purpose of the Study:

  • To demonstrate achromatic optical transmission through a planar Fabry-Pérot micro-cavity.
  • To overcome the limitations of narrow linewidths in micro-cavity resonances.
  • To enable continuous light resonance over a broad spectral span.

Main Methods:

  • Exploited angularly multiplexed phase-matching using a bio-inspired grating configuration.
  • Correlated specific wavelengths with appropriate angles of incidence for resonance.
  • De-slanted a single-order resonance in spectral-angular space.

Main Results:

  • Achieved achromatic optical transmission through the planar micro-cavity.
  • Transformed a narrow 0.7-nm resonance into a 60-nm-wide achromatic resonance.
  • Created an 'omni-resonant' cavity with continuous resonance over a broad spectral span.

Conclusions:

  • The developed omni-resonant cavity severs the link between resonance bandwidth and cavity-photon lifetime.
  • Promises resonant enhancement of linear and nonlinear optical effects over broad bandwidths.
  • Enables applications in ultrathin devices requiring broadband resonant enhancement.