Wave vector filter based on surface and Tamm plasmon polaritons

Area of Science:

• Photonics and Optics
• Materials Science
• Nanotechnology

Background:

• Conventional optical filters struggle to control both wavelength and incident angle simultaneously.
• Surface plasmon polaritons (SPPs) offer wave vector selectivity, while Tamm plasmon polaritons (TPPs) provide low-loss field enhancement.
• Simultaneous control over spectral and angular properties is crucial for advanced optical systems.

Purpose of the Study:

• To propose and demonstrate a novel wave vector filter based on coupling-induced transparency (CIT).
• To achieve simultaneous wavelength and incident-angle selection in the short-wave infrared (SWIR) regime.
• To overcome the limitations of conventional optical filters in multi-parameter control.

Main Methods:

• Leveraging coupling-induced transparency (CIT) between surface plasmon polaritons (SPPs) and Tamm plasmon polaritons (TPPs).
• Utilizing silver gratings and Ag/distributed Bragg reflector (DBR) layers for structural optimization.
• Experimental validation and comparison with theoretical models to confirm the dual-selectivity mechanism.

Main Results:

• A transmission peak of 60% was achieved at 2.08 μm.
• The filter demonstrated exceptional wave vector selectivity, with transmission intensity decreasing by an order of magnitude for a mere 0.2° angular deviation.
• Experimental results showed strong agreement with theoretical predictions, confirming the angle-wavelength dual-selectivity.

Conclusions:

• The developed CIT-based wave vector filter successfully enables simultaneous wavelength and incident-angle selection.
• This technology offers a breakthrough for applications such as hyperspectral imaging, multi-channel sensing, and on-chip nonlinear photonic systems.
• The CIT platform presents a novel design paradigm for photonic devices requiring joint spectral-spatial resolution.