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Ultra-broadband on-chip reconstructive spectrometer via controlled mode mismatch.
Optics Letters
|November 4, 2025
Summary
Researchers developed a compact, miniaturized reconstructive spectrometer using a novel waveguide design. This device achieves high resolution and bandwidth, enabling integration into portable sensing applications.
Area of Science:
- Photonics and Optical Engineering
- Integrated Optics
- Spectroscopy
Background:
- Miniaturized spectrometers are crucial for portable sensing.
- Existing designs often face challenges in resolution, bandwidth, or integration.
- Waveguide-based approaches offer potential for compact optical systems.
Purpose of the Study:
- To demonstrate a miniaturized reconstructive spectrometer with enhanced performance.
- To explore a novel compact double-spiral, rounded-corner rectangular waveguide architecture.
- To facilitate the integration of high-resolution spectrometers into portable platforms.
Main Methods:
- Designed and fabricated a spectrometer using a compact double-spiral, rounded-corner rectangular waveguide.
- Utilized bidirectional evanescent coupling to control mode mismatch.
- Leveraged wavelength-dependent signature patterns for spectral reconstruction.
Main Results:
- Achieved a spectral resolution of 0.08 nm.
- Demonstrated a bandwidth of 150 nm (1490-1640 nm) centered at 1565 nm.
- Fabricated the device on silicon nitride for structural simplicity.
Conclusions:
- The demonstrated waveguide architecture enables miniaturized reconstructive spectroscopy.
- The device offers high resolution and bandwidth suitable for portable sensing.
- The simple design facilitates integration into various sensing platforms.
