Tailoring a Plasmonic Topological Architecture for a Hyperspectral Resolution Pyroelectric Detector

Area of Science:

• Optoelectronics
• Nanotechnology
• Spectroscopy

Background:

• The near-infrared (NIR) waveband (1100-1300 nm) offers high spectral information density, crucial for photodetection and spectroscopy.
• Existing semiconductor materials and thick multifilms pose challenges for achieving hyperspectral resolution in the NIR band due to bandgap limitations and system complexity.

Purpose of the Study:

• To develop a novel plasmonic topological architecture for high-resolution hyperspectral photodetection in the NIR waveband.
• To overcome the limitations of conventional materials and complex filter systems in achieving narrowband spectral characteristics.

Main Methods:

• Designed and fabricated a plasmonic topological architecture integrated with a pyroelectric detector.
• Excited surface lattice resonances (SLRs) using the plasmonic topological layer to achieve narrowband spectral filtering.
• Engineered the spectral response by controlling the period and orientation angle of the nanostructures.

Main Results:

• Achieved a narrowband detector response with a full width at half-maximum (FWHM) as low as 1 nm and a high quality factor (Q) of 1168 near 1100 nm.
• Demonstrated continuous tunability of the response peak's wavelength and width by altering the architecture's geometric parameters.
• Significantly improved the detector's response speed due to the plasmonic topological layer.

Conclusions:

• The developed plasmonic topological architecture offers a concise and effective strategy for hyperspectral resolution photodetection.
• This approach bypasses inherent material and waveband constraints, paving the way for advanced spectroscopic and imaging applications.
• The ultrathin (tens of nanometers) topological layer simplifies detection system design compared to micrometer-scale filters.