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On-chip optical filters with designable characteristics based on an interferometer with embedded silicon photonic
Serdar Kocaman1, Mehmet S Aras, Nicolae C Panoiu
1Optical Nanostructures Laboratory, Columbia University, New York, New York 10027, USA. sk2927@columbia.edu
Optics Letters
|February 21, 2012
Summary
We developed chip-scale photonic filters using novel Mach-Zehnder interferometers. This breakthrough enables precise control over optical filtering for integrated photonic circuits, enhancing performance and versatility.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
Background:
- Photonic crystal devices offer unique light manipulation properties.
- Mach-Zehnder interferometers are fundamental components in integrated optics.
- Achieving precise optical filtering with flat-top responses remains a challenge.
Purpose of the Study:
- To demonstrate chip-scale flat-top optical filters at near-infrared wavelengths.
- To introduce a new method for engineering various filter types (high-pass, low-pass, bandpass, band-reject).
- To enable deterministic control over filter bandwidth and rejection ratio in integrated photonic circuits.
Main Methods:
- Utilizing negative index photonic crystals integrated into Mach-Zehnder interferometers.
- Employing full three-dimensional numerical simulations for design validation.
- Engineering photonic band diagrams within and outside the bandgap frequency regions.
Main Results:
- Experimental demonstration of chip-scale flat-top filters.
- Successful engineering of high-pass, low-pass, bandpass, and band-reject filter functionalities.
- Demonstration of tunable multilevel filter responses for different spectrum sections and polarizations.
Conclusions:
- The proposed approach provides deterministic control over filter characteristics.
- This technology is suitable for advanced integrated photonic circuits requiring tailored optical filtering.
- The method offers a versatile platform for designing complex optical filters on a chip.
