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Optical filters consisting of metallic waveguide arrays
1US Naval Research Laboratory, Washington, DC 20375, USA. armand.rosenberg@nrl.navy.mil
Summary
We developed novel high-pass optical filters using metal-coated channel-glass (CG) materials. These filters offer tunable spectral properties for versatile optical applications.
Area of Science:
- Photonics and Materials Science
Background:
- Optical filters are crucial components in various photonic applications.
- Existing filter technologies face limitations in tunability and spectral precision.
Purpose of the Study:
- To demonstrate novel high-pass optical filters utilizing channel-glass (CG) materials.
- To investigate the relationship between CG structure and filter performance.
Main Methods:
- Fabrication of uniform arrays of hollow metallic waveguides by coating CG wafers with metal films.
- Characterization of filter properties, including cutoff wavelength, cutoff sharpness, and transmission efficiency.
- Systematic variation of channel diameter, channel length, and channel density in CG materials.
Main Results:
- Achieved high-pass optical filters with tunable cutoffs in the 0.3-10-micron spectral region.
- Demonstrated control over cutoff frequency via channel diameter and cutoff sharpness via channel length.
- Observed transmission peaks above the cutoff wavelength exceeding geometrical predictions.
Conclusions:
- Channel-glass (CG) based hollow metallic waveguides offer a versatile platform for creating high-pass optical filters.
- Precise control over CG material parameters allows for tailored filter performance.
- The developed filters show promise for applications requiring specific spectral filtering capabilities.