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The first chip-level broadband optical system can sense mid-infrared molecules

For the first time, researchers at Columbia Engineering demonstrated a chip-based, two-comb spectrometer in the mid-infrared range that requires no moving parts and captures the spectrum in less than two microseconds. The system consists of two coherent, low-noise, micro-resonator frequency combs ranging from 2600 nm to 4100 nm, which could lead to the development of spectrolab chips for real-time sensing on the nanosecond scale. Professor Alexander gaeta, senior author of the study, published in nature communications' May 14 issue of applied physics and materials science, said: "our results show the widest optical bandwidth on an integrated platform in dual spectroscopy.

Creating spectral sensing devices on chips that allow real-time, high-throughput detection of trace molecules is challenging. A few months ago, a team led by Gaeta and Michal Lipson, professor of electrical engineering at Higgins, was the first to shrink the dual-frequency comb by installing two frequency comb generators on a chip the size of a millimeter. They have been working to increase the frequency range of the dual-comb and increase the resolution of the spectrometer by adjusting the lines of the comb. In the current study, the researchers focused on the mid-infrared (mid-infrared) range, because it typically absorbs 10 to 1,000 times more powerful molecules than visible or near-infrared spectra, making it ideal for detecting trace molecules. The mid-infrared spectrum effectively covers the "fingerprint" of many molecules.

The team used two silicon nanophotonic devices as micromagnetic resonance devices to conduct the mid-infrared dual-comb spectral analysis. Their integrated device characterizes molecular absorption by the direct generation and rapid acquisition of infrared light in broadband. Gaeta laboratory, the paper's lead author, doctoral Meng Jie said: our work is based on an important progress in the study of double spectrum of chip, chip level of our broadband optical system, is essentially a photon lab chips, very suitable for used to identify chemical species, and in the chemical, biological medicine, materials science, and find a wide range of applications for industrial process control. The title of the study is "mid-infrared two-comb spectroscopy based on silicon chips."