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Related Experiment Video

Updated: Jun 8, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Littrow-mounted diffraction grating cavity.

|September 24, 2010

Summary

This study models grating resonators using a tilted-mirror Fabry-Perot cavity. The findings reveal how cavity axial mode separation is determined and predict effects on finesse and mode broadening.

Area of Science:

Optics
Resonant Cavity Physics
Diffraction Theory

Background:

Grating resonators lack a single cavity length, complicating mode spacing determination.
Traditional standing-wave patterns are insufficient for analyzing grating resonator cavity modes.

Purpose of the Study:

To model the behavior of Littrow grating cavities.
To determine the cavity axial mode separation in grating resonators.
To predict the effects of wavelength deviation on cavity finesse and mode broadening.

Main Methods:

Geometric ray tracing was employed to analyze the grating cavity.
Scalar diffraction theory was used to calculate the phase of diffracted plane waves.
A passive grating cavity was experimentally investigated using interferometry and a tunable laser.

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Main Results:

A grating cavity can be modeled as a tilted-mirror Fabry-Perot cavity.
The tilt magnitude is linearly dependent on wavelength deviation from the resonant Littrow wavelength.
Cavity axial mode separation is given by c/2L(C), where L(C) is the grating-cavity length.
Finesse decrease and mode broadening effects were predicted and found to be linearly dependent on wavelength deviation.

Conclusions:

The proposed model accurately represents grating resonator behavior.
The study provides a method for determining mode spacing in grating cavities.
Experimental validation confirmed the predicted effects of wavelength deviation on cavity performance.