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Subwavelength dichroic demultiplexer based on double Fabry-Perot cavities
Optics Express
|October 19, 2022
Summary
Researchers developed a subwavelength plasmonic demultiplexer for optical communication. This device offers broadband spectral range and high splitting ratio, advancing integrated photonic circuits.
Area of Science:
- Photonics and Nanotechnology
- Plasmonics
- Integrated Optics
Background:
- Plasmonic demultiplexers are crucial for subwavelength optical devices.
- Previous designs faced limitations in splitting structure, hindering integrated photonic circuits.
- Applications include optical communication, manipulation, and ultrafast data processing.
Purpose of the Study:
- To demonstrate a novel plasmonic demultiplexer with subwavelength dimensions.
- To achieve a high splitting ratio and broadband spectral range.
- To overcome limitations in current integrated photonic circuit designs.
Main Methods:
- Integration of two adjacent Fabry-Perot cavities with coupling gratings.
- Utilizing a gold (Au) waveguide and PMMA polymer.
- Experimental and theoretical analysis of device performance.
Main Results:
- Achieved a subwavelength feature size of 0.54 µm.
- Demonstrated a broadband spectral range from 620-870 nm.
- Obtained a high splitting ratio of 17 dB experimentally and 20 dB theoretically.
Conclusions:
- The developed double-cavity plasmonic demultiplexer offers a simple design and fabrication process.
- This device advances the realization of subwavelength and high-splitting ratio dichroic splitters.
- Potential applications include multi-wavelength photodetectors and optical multichannel interconnects.
