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Surface-roughness-induced contradirectional coupling in ring and disk resonators.

B E Little, J P Laine, S T Chu

|January 1, 1997

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Random surface roughness in periodic structures causes enhanced reflections, potentially harming traveling-wave resonator performance. This analytical study investigates these effects and their impact on resonant peaks.

Area of Science:

Optics and Photonics
Materials Science

Background:

Periodic structures like dielectric rings and disks are crucial in optical devices.
Surface roughness is an unavoidable imperfection in fabricated structures.
Understanding light propagation and reflection is key to device performance.

Purpose of the Study:

To analytically investigate the impact of random surface roughness on reflections in periodic structures.
To understand the phase matching of forward- and backward-propagating modes due to roughness.
To analyze the detrimental effects of enhanced reflections on traveling-wave resonators.

Main Methods:

Analytical modeling of electromagnetic wave propagation.
Derivation of reflection coefficients considering surface roughness.

Related Experiment Videos

Analysis of mode coupling and resonant peak behavior.

Main Results:

Random surface roughness inherently phase matches forward- and backward-propagating modes.
Small reflections are significantly enhanced due to this phase matching.
Contradirectional coupling caused by roughness leads to resonant peak splitting.

Conclusions:

Surface roughness in periodic dielectric structures is a critical factor affecting optical performance.
Enhanced reflections and resonant peak splitting impair traveling-wave resonator functionality.
Analytical insights are provided into managing these roughness-induced effects.