On-chip spectroscopy with thermally-tuned high-Q photonic crystal cavities

Abstract

Spectroscopic methods are a sensitive way to determine the chemical composition of potentially hazardous materials. Here, we demonstrate that thermally-tuned high-Q photonic crystal cavities can be used as a compact high-resolution on-chip spectrometer. We have used such a chip-scale spectrometer to measure the absorption spectra of both acetylene and hydrogen cyanide in the 1550 nm spectral band, and show that we can discriminate between the two chemical species even though the two materials have spectral features in the same spectral region. Our results pave the way for the development of chip-size chemical sensors that can detect toxic substances.

References in corpus (3)

• Photonic Crystal Spectrometer
• Local tuning of photonic crystal cavities using chalcogenide glasses
• Selective tuning of high-Q silicon photonic crystal nanocavities via laser-assisted local oxidation

Cited by in corpus (7)

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• Neural network-based on-chip spectroscopy using a scalable plasmonic encoder
• Tuning out disorder-induced localization in nanophotonic cavity arrays
• Scalable construction of hybrid quantum photonic cavities
• Inverse Design of Photonic Metasurface Gratings for Beam Collimation in Opto-fluidic Sensing
• Digital Fourier transform spectroscopy: a high-performance, scalable technology for on-chip spectrum analysis
• Eigenvalue-accelerated LDOS optimization of high-Q optical resonances