Guided mode resonance flat-top bandpass filter for terahertz telecom applications

Area of Science:

• Physics
• Electrical Engineering
• Materials Science

Background:

• Terahertz (THz) technology is crucial for emerging applications like wireless telecommunications.
• Efficient and cost-effective narrowband filters are needed for THz systems.
• Atmospheric transmission windows present opportunities for THz communication.

Purpose of the Study:

• To design and experimentally demonstrate a novel THz filter.
• To achieve a flattened spectral response within the atmospheric transmission window.
• To explore the coupling of Fabry-Perot and guided mode resonances for filter design.

Main Methods:

• Utilized a two-dimensional patch array patterned on an aluminum layer.
• Deposited the aluminum layer on a low-loss cyclo-olefin polymer substrate.
• Experimentally characterized the filter's spectral response, transmittance, and rejection.

Main Results:

• Achieved a flattened spectral response around 300 GHz.
• Demonstrated high transmittance with less than 3 dB losses in the flat-top band.
• Exhibited high out-of-band rejection, aligning with theoretical predictions.

Conclusions:

• The novel THz filter offers a cost-effective solution for narrowband filtering.
• The filter's performance is suitable for emerging THz devices and systems.
• Potential applications include wireless telecommunications utilizing THz frequencies.