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Microcavity confinement based on an anomalous zero group-velocity waveguide mode.

Mihai Ibanescu¹, Steven G Johnson, David Roundy

¹Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. michel@mit.edu

|March 26, 2005

Summary

We developed a novel high-Q cavity using a special waveguide. This design confines light with zero group velocity, significantly boosting the cavity

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Area of Science:

Photonics
Optical Engineering
Waveguide Physics

Background:

High-quality factor (Q) optical cavities are crucial for various photonic applications.
Existing cavity designs often face limitations in achieving small modal volumes and high Q-factors simultaneously.

Purpose of the Study:

To propose and demonstrate a new mechanism for creating small-modal-volume, high-Q optical cavities.
To leverage an anomalous uniform waveguide mode with zero group velocity for enhanced light confinement.

Main Methods:

Utilizing a uniform waveguide with a specifically engineered cross-section.
Confining light longitudinally via slow group velocity propagation.
Confining light transversely using a reflective cladding.

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Main Results:

Demonstrated a mechanism for achieving high Q-factors in small-volume cavities.
Showcased enhanced light confinement due to zero group velocity at a non-zero wave vector.
Identified optimal cavity lengths for Q-factor enhancement, related to pi/k0.

Conclusions:

The proposed waveguide mechanism offers a promising route to small-modal-volume, high-Q cavities.
This approach enhances light confinement by exploiting anomalous waveguide modes.
The findings have implications for advanced optical devices and integrated photonics.