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Phase-modulated axilenses for infrared multiband spectroscopy
Optics Letters
|April 15, 2020
Summary
We developed compact axilens devices for long-wavelength infrared (LWIR) detection. These devices offer efficient focusing and spectral selectivity, enabling new applications in miniaturized optical systems.
Area of Science:
- Optics and Photonics
- Infrared Technology
Background:
- Miniaturized optical components are crucial for advanced sensing.
- Long-wavelength infrared (LWIR) applications require efficient and selective detection methods.
Purpose of the Study:
- To design and characterize compact phase-modulated axilens devices for LWIR operation.
- To integrate focusing and spectral selectivity into a single component for multiband LWIR photodetection.
Main Methods:
- Utilized Rayleigh-Sommerfeld (RS) diffraction theory for device design.
- Validated designs numerically using the finite element method (FEM).
- Characterized focusing efficiency, spectral response, and crosstalk ratio of fabricated devices.
Main Results:
- Demonstrated compact, four-level phase-modulated axilens devices for LWIR (6-12 µm).
- Achieved efficient point focusing and grating selectivity.
- Showcased a single-component microspectrometer with broadband and polarization-insensitive performance.
Conclusions:
- The developed axilens devices are suitable for monolithic integration with infrared focal plane arrays (IR-FPAs).
- These devices enhance miniaturized optical systems with fundamental spectroscopic capabilities for LWIR detection and spectroscopy.
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