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Codeposition of continuous composition rugate filters.

W J Gunning, R L Hall, F J Woodberry

|June 18, 2010

Summary

Rugate filters with sinusoidal profiles were created using SiO(2) and TiO(2) codeposition. These filters show two distinct reflection stopbands, indicating successful fabrication of advanced optical thin film structures.

Area of Science:

Optics
Materials Science
Thin Film Technology

Background:

Rugate filters are advanced optical interference structures characterized by periodic variations in refractive index.
These filters are crucial for applications requiring precise wavelength selectivity in optical systems.

Purpose of the Study:

To fabricate and characterize two-wavelength reflection filters using rugate filter technology.
To investigate the feasibility of codepositing SiO(2) and TiO(2) for creating sinusoidal refractive index profiles.

Main Methods:

Fabrication of rugate filters via codeposition of silicon dioxide (SiO(2)) and titanium dioxide (TiO(2)).
Utilized quartz crystal rate controllers for precise monitoring and control of composition modulation during deposition.
Characterization of the fabricated filters, including optical performance analysis and microscopic examination.

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Main Results:

Successfully fabricated filters exhibiting two distinct and well-defined reflection stopbands.
Confirmed the sinusoidal refractive index profile characteristic of rugate filters.
Microscopic analysis revealed a glasslike, homogeneous thin film structure with minimal microstructure.

Conclusions:

Codeposition of SiO(2) and TiO(2) is an effective method for fabricating two-wavelength rugate filters.
Quartz crystal rate controllers provide accurate control over the thin film deposition process.
The resulting filters possess desirable optical properties and structural integrity for optical applications.