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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

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Broadband Spectrometer with Single-Photon Sensitivity Exploiting Tailored Disorder.

Wladick Hartmann^1,2, Paris Varytis^3,4, Helge Gehring^1,2

¹Institute of Physics, University of Münster, Wilhelm-Klemm-Strasse 10, 48149 Münster, Germany.

|March 12, 2020

Summary

This study presents an on-chip random spectrometer using tailored disorder for broadband light scattering. This compact device achieves high-resolution signal analysis, even in photon-scarce conditions, by enhancing light path length through multiple scattering events.

Keywords:

SNSPD Silicon nitride broadband infrared integrated optics random spectrometer silicon photonics tailored disorder visible

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Area of Science:

Nanophotonics
Quantum Optics
Spectroscopy

Background:

Nanophotonic spectrometers offer compact solutions for signal analysis.
Achieving high resolution in small footprints often requires complex designs.
Disordered media can enhance light path length through multiple scattering.

Purpose of the Study:

To demonstrate an on-chip random spectrometer with enhanced resolution and sensitivity.
To integrate superconducting single-photon detectors for photon-scarce environments.
To enable high-resolution spectral analysis in a compact device.

Main Methods:

Utilizing tailored disorder for broadband light scattering in silicon nitride waveguides.
Implementing efficient broadband fiber-to-chip coupling.
Cointegrating superconducting nanowire single-photon detectors with the spectrometer.
Employing spectral-to-spatial mapping via the transmission matrix for signal reconstruction.

Main Results:

Demonstrated an on-chip random spectrometer operating in a diffusive regime.
Achieved high-resolution signal analysis with a small device footprint.
Showcased operation over a wide spectral range.
Attained sensitivity down to -111.5 dBm in the telecom band.

Conclusions:

Tailored disorder in nanophotonic devices enables high-resolution spectroscopy.
The developed on-chip spectrometer is suitable for photon-scarce applications.
This approach offers a compact and sensitive platform for spectral analysis.